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The Future of Sustainable Energy

26 June, 2021

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Building a sustainable energy future calls for leaps forward in both technology and policy leadership. State governments, major corporations and nations around the world have pledged to address the worsening climate crisis by transitioning to 100% renewable energy over the next few decades. Turning those statements of intention into a reality means undertaking unprecedented efforts and collaboration between disciplines ranging from environmental science to economics.

There are highly promising opportunities for green initiatives that could deliver a better future. However, making a lasting difference will require both new technology and experts who can help governments and organizations transition to more sustainable practices. These leaders will be needed to source renewables efficiently and create environmentally friendly policies, as well as educate consumers and policymakers. To maximize their impact, they must make decisions informed by the most advanced research in clean energy technology, economics, and finance.

Current Trends in Sustainability

The imperative to adopt renewable power solutions on a worldwide scale continues to grow even more urgent as the global average surface temperature hits historic highs and amplifies the danger from extreme weather events . In many regions, the average temperature has already increased by 1.5 degrees , and experts predict that additional warming could drive further heatwaves, droughts, severe hurricanes, wildfires, sea level rises, and even mass extinctions.

In addition, physicians warn that failure to respond to this dire situation could unleash novel diseases : Dr. Rexford Ahima and Dr. Arturo Casadevall of the Johns Hopkins University School of Medicine contributed to an article in the Journal of Clinical Investigation that explained how climate change could affect the human body’s ability to regulate its own temperature while bringing about infectious microbes that adapt to the warmer conditions.

World leaders have accepted that greenhouse gas emissions are a serious problem that must be addressed. Since the Paris Agreement was first adopted in December 2015, 197 nations have signed on to its framework for combating climate change and preventing the global temperature increase from reaching 2 degrees Celsius over preindustrial levels.

Corporate giants made their own commitments to become carbon neutral by funding offsets to reduce greenhouse gases and gradually transitioning into using 100% renewable energy. Google declared its operations carbon neutral in 2017 and has promised that all data centers and campuses will be carbon-free by 2030. Facebook stated that it would eliminate its carbon footprint in 2020 and expand that commitment to all the organization’s suppliers within 10 years. Amazon ordered 100,000 electric delivery vehicles and has promised that its sprawling logistics operations will arrive at net-zero emissions by 2040.

Despite these promising developments, many experts say that nations and businesses are still not changing fast enough. While carbon neutrality pledges are a step in the right direction, they don’t mean that organizations have actually stopped using fossil fuels . And despite the intentions expressed by Paris Agreement signatories, total annual carbon dioxide emissions reached a record high of 33.5 gigatons in 2018, led by China, the U.S., and India.

“The problem is that what we need to achieve is so daunting and taxes our resources so much that we end up with a situation that’s much, much worse than if we had focused our efforts,” Ferraro said.

Recent Breakthroughs in Renewable Power

An environmentally sustainable infrastructure requires innovations in transportation, industry, and utilities. Fortunately, researchers in the private and public sectors are laying the groundwork for an energy transformation that could make the renewable energy of the future more widely accessible and efficient.

Some of the most promising areas that have seen major developments in recent years include:

Driving Electric Vehicles Forward

The technical capabilities of electric cars are taking great strides, and the popularity of these vehicles is also growing among consumers. At Tesla’s September 22, 2020 Battery Day event, Elon Musk announced the company’s plans for new batteries that can be manufactured at a lower cost while offering greater range and increased power output .

The electric car market has seen continuing expansion in Europe even during the COVID-19 pandemic, thanks in large part to generous government subsidies. Market experts once predicted that it would take until 2025 for electric car prices to reach parity with gasoline-powered vehicles. However, growing sales and new battery technology could greatly speed up that timetable .

Cost-Effective Storage For Renewable Power

One of the biggest hurdles in the way of embracing 100% renewable energy has been the need to adjust supply based on demand. Utilities providers need efficient, cost-effective ways of storing solar and wind power so that electricity is available regardless of weather conditions. Most electricity storage currently takes place in pumped-storage hydropower plants, but these facilities require multiple reservoirs at different elevations.

Pumped thermal electricity storage is an inexpensive solution to get around both the geographic limitations of hydropower and high costs of batteries. This approach, which is currently being tested , uses a pump to convert electricity into heat so it can be stored in a material like gravel, water, or molten salts and kept in an insulated tank. A heat engine converts the heat back into electricity as necessary to meet demand.

Unlocking the Potential of Microgrids

Microgrids are another area of research that could prove invaluable to the future of power. These systems can operate autonomously from a traditional electrical grid, delivering electricity to homes and business even when there’s an outage. By using this approach with power sources like solar, wind, or biomass, microgrids can make renewable energy transmission more efficient.

Researchers in public policy and engineering are exploring how microgrids could serve to bring clean electricity to remote, rural areas . One early effort in the Netherlands found that communities could become 90% energy self-sufficient , and solar-powered microgrids have now also been employed in Indian villages. This technology has enormous potential to change the way we access electricity, but lowering costs is an essential step to bring about wider adoption and encourage residents to use the power for purposes beyond basic lighting and cooling.

Advancing the Future of Sustainable Energy

There’s still monumental work to be done in developing the next generation of renewable energy solutions as well as the policy framework to eliminate greenhouse gases from our atmosphere. An analysis from the International Energy Agency found that the technologies currently on the market can only get the world halfway to the reductions needed for net-zero emissions by 2050.

To make it the rest of the way, researchers and policymakers must still explore possibilities such as:

Devise and implement large-scale carbon capture systems that store and use carbon dioxide without polluting the atmosphere
Establish low-carbon electricity as the primary power source for everyday applications like powering vehicles and heat in buildings
Grow the use of bioenergy harnessed from plants and algae for electricity, heat, transportation, and manufacturing
Implement zero-emission hydrogen fuel cells as a way to power transportation and utilities

However, even revolutionary technology will not do the job alone. Ambitious goals for renewable energy solutions and long-term cuts in emissions also demand enhanced international cooperation, especially among the biggest polluters. That’s why Jonas Nahm of the Johns Hopkins School of Advanced International Studies has focused much of his research on China’s sustainable energy efforts. He has also argued that the international community should recognize China’s pivotal role in any long-term plans for fighting climate change.

As both the leading emitter of carbon dioxide and the No. 1 producer of wind and solar energy, China is uniquely positioned to determine the future of sustainability initiatives. According to Nahm, the key to making collaboration with China work is understanding the complexities of the Chinese political and economic dynamics. Because of conflicting interests on the national and local levels, the world’s most populous nation continues to power its industries with coal even while President Xi Jinping advocates for fully embracing green alternatives.

China’s fraught position demonstrates that economics and diplomacy could prove to be just as important as technical ingenuity in creating a better future. International cooperation must guide a wide-ranging economic transformation that involves countries and organizations increasing their capacity for producing and storing renewable energy.

It will take strategic thinking and massive investment to realize a vision of a world where utilities produce 100% renewable power while rows of fully electric cars travel on smart highways. To meet the challenge of our generation, it’s more crucial than ever to develop leaders who understand how to apply the latest research to inform policy and who can take charge of globe-spanning sustainable energy initiatives .

About the MA in Sustainable Energy (online) Program at Johns Hopkins SAIS

Created by Johns Hopkins University School of Advanced International Studies faculty with input from industry experts and employers, the Master of Arts in Sustainable Energy (online) program is tailored for the demands of a rapidly evolving sector. As a top-11 global university, Johns Hopkins is uniquely positioned to equip graduates with the skills they need to confront global challenges in the transition to renewable energy.

The MA in Sustainable Energy curriculum is designed to build expertise in finance, economics, and policy. Courses from our faculty of highly experienced researchers and practitioners prepare graduates to excel in professional environments including government agencies, utility companies, energy trade organizations, global energy governance organizations, and more. Students in the Johns Hopkins SAIS benefit from industry connections, an engaged network of more than 230,000 alumni, and high-touch career services.

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renewable energy , usable energy derived from replenishable sources such as the Sun ( solar energy ), wind ( wind power ), rivers ( hydroelectric power ), hot springs ( geothermal energy ), tides ( tidal power ), and biomass ( biofuels ).

The transition to renewable energy explained by Phil the Fixer

At the beginning of the 21st century, about 80 percent of the world’s energy supply was derived from fossil fuels such as coal , petroleum , and natural gas . Fossil fuels are finite resources; most estimates suggest that the proven reserves of oil are large enough to meet global demand at least until the middle of the 21st century. Fossil fuel combustion has a number of negative environmental consequences. Fossil-fueled power plants emit air pollutants such as sulfur dioxide , particulate matter , nitrogen oxides, and toxic chemicals (heavy metals: mercury , chromium , and arsenic ), and mobile sources, such as fossil-fueled vehicles, emit nitrogen oxides, carbon monoxide , and particulate matter. Exposure to these pollutants can cause heart disease , asthma , and other human health problems. In addition, emissions from fossil fuel combustion are responsible for acid rain , which has led to the acidification of many lakes and consequent damage to aquatic life, leaf damage in many forests, and the production of smog in or near many urban areas. Furthermore, the burning of fossil fuels releases carbon dioxide (CO 2 ), one of the main greenhouse gases that cause global warming .

In contrast, renewable energy sources accounted for nearly 20 percent of global energy consumption at the beginning of the 21st century, largely from traditional uses of biomass such as wood for heating and cooking . By 2015 about 16 percent of the world’s total electricity came from large hydroelectric power plants, whereas other types of renewable energy (such as solar, wind, and geothermal) accounted for 6 percent of total electricity generation. Some energy analysts consider nuclear power to be a form of renewable energy because of its low carbon emissions; nuclear power generated 10.6 percent of the world’s electricity in 2015.

Growth in wind power exceeded 20 percent and photovoltaics grew at 30 percent annually in the 1990s, and renewable energy technologies continued to expand throughout the early 21st century. Between 2001 and 2017 world total installed wind power capacity increased by a factor of 22, growing from 23,900 to 539,581 megawatts. Photovoltaic capacity also expanded, increasing by 50 percent in 2016 alone. The European Union (EU), which produced an estimated 6.38 percent of its energy from renewable sources in 2005, adopted a goal in 2007 to raise that figure to 20 percent by 2020. By 2016 some 17 percent of the EU’s energy came from renewable sources. The goal also included plans to cut emissions of carbon dioxide by 20 percent and to ensure that 10 percent of all fuel consumption comes from biofuels . The EU was well on its way to achieving those targets by 2017. Between 1990 and 2016 the countries of the EU reduced carbon emissions by 23 percent and increased biofuel production to 5.5 percent of all fuels consumed in the region. In the United States numerous states have responded to concerns over climate change and reliance on imported fossil fuels by setting goals to increase renewable energy over time. For example, California required its major utility companies to produce 20 percent of their electricity from renewable sources by 2010, and by the end of that year California utilities were within 1 percent of the goal. In 2008 California increased this requirement to 33 percent by 2020, and in 2017 the state further increased its renewable-use target to 50 percent by 2030.

Renewable Energy

Renewable energy comes from sources that will not be used up in our lifetimes, such as the sun and wind.

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Wind Turbines in a Sheep Pasture

Wind turbines use the power of wind to generate energy. This is just one source of renewable energy.

Photograph by Jesus Keller/ Shutterstock

The wind, the sun, and Earth are sources of renewable energy . These energy sources naturally renew, or replenish themselves.

Wind, sunlight, and the planet have energy that transforms in ways we can see and feel. We can see and feel evidence of the transfer of energy from the sun to Earth in the sunlight shining on the ground and the warmth we feel when sunlight shines on our skin. We can see and feel evidence of the transfer of energy in wind’s ability to pull kites higher into the sky and shake the leaves on trees. We can see and feel evidence of the transfer of energy in the geothermal energy of steam vents and geysers .

People have created different ways to capture the energy from these renewable sources.

Solar Energy

Solar energy can be captured “actively” or “passively.”

Active solar energy uses special technology to capture the sun’s rays. The two main types of equipment are photovoltaic cells (also called PV cells or solar cells) and mirrors that focus sunlight in a specific spot. These active solar technologies use sunlight to generate electricity , which we use to power lights, heating systems, computers, and televisions.

Passive solar energy does not use any equipment. Instead, it gets energy from the way sunlight naturally changes throughout the day. For example, people can build houses so their windows face the path of the sun. This means the house will get more heat from the sun. It will take less energy from other sources to heat the house.

Other examples of passive solar technology are green roofs , cool roofs, and radiant barriers . Green roofs are completely covered with plants. Plants can get rid of pollutants in rainwater and air. They help make the local environment cleaner.

Cool roofs are painted white to better reflect sunlight. Radiant barriers are made of a reflective covering, such as aluminum. They both reflect the sun’s heat instead of absorbing it. All these types of roofs help lower the amount of energy needed to cool the building.

Advantages and Disadvantages There are many advantages to using solar energy. PV cells last for a long time, about 20 years.

However, there are reasons why solar power cannot be used as the only power source in a community. It can be expensive to install PV cells or build a building using passive solar technology.

Sunshine can also be hard to predict. It can be blocked by clouds, and the sun doesn’t shine at night. Different parts of Earth receive different amounts of sunlight based on location, the time of year, and the time of day.

Wind Energy

People have been harnessing the wind’s energy for a long, long time. Five-thousand years ago, ancient Egyptians made boats powered by the wind. In 200 B.C.E., people used windmills to grind grain in the Middle East and pump water in China.

Today, we capture the wind’s energy with wind turbines . A turbine is similar to a windmill; it has a very tall tower with two or three propeller-like blades at the top. These blades are turned by the wind. The blades turn a generator (located inside the tower), which creates electricity.

Groups of wind turbines are known as wind farms . Wind farms can be found near farmland, in narrow mountain passes, and even in the ocean, where there are steadier and stronger winds. Wind turbines anchored in the ocean are called “ offshore wind farms.”

Wind farms create electricity for nearby homes, schools, and other buildings.

Advantages and Disadvantages Wind energy can be very efficient . In places like the Midwest in the United States and along coasts, steady winds can provide cheap, reliable electricity.

Another great advantage of wind power is that it is a “clean” form of energy. Wind turbines do not burn fuel or emit any pollutants into the air.

Wind is not always a steady source of energy, however. Wind speed changes constantly, depending on the time of day, weather , and geographic location. Currently, it cannot be used to provide electricity for all our power needs.

Wind turbines can also be dangerous for bats and birds. These animals cannot always judge how fast the blades are moving and crash into them.

Geothermal Energy

Deep beneath the surface is Earth’s core . The center of Earth is extremely hot—thought to be over 6,000 °C (about 10,800 °F). The heat is constantly moving toward the surface.

We can see some of Earth’s heat when it bubbles to the surface. Geothermal energy can melt underground rocks into magma and cause the magma to bubble to the surface as lava . Geothermal energy can also heat underground sources of water and force it to spew out from the surface. This stream of water is called a geyser.

However, most of Earth’s heat stays underground and makes its way out very, very slowly.

We can access underground geothermal heat in different ways. One way of using geothermal energy is with “geothermal heat pumps.” A pipe of water loops between a building and holes dug deep underground. The water is warmed by the geothermal energy underground and brings the warmth aboveground to the building. Geothermal heat pumps can be used to heat houses, sidewalks, and even parking lots.

Another way to use geothermal energy is with steam. In some areas of the world, there is underground steam that naturally rises to the surface. The steam can be piped straight to a power plant. However, in other parts of the world, the ground is dry. Water must be injected underground to create steam. When the steam comes to the surface, it is used to turn a generator and create electricity.

In Iceland, there are large reservoirs of underground water. Almost 90 percent of people in Iceland use geothermal as an energy source to heat their homes and businesses.

Advantages and Disadvantages An advantage of geothermal energy is that it is clean. It does not require any fuel or emit any harmful pollutants into the air.

Geothermal energy is only avaiable in certain parts of the world. Another disadvantage of using geothermal energy is that in areas of the world where there is only dry heat underground, large quantities of freshwater are used to make steam. There may not be a lot of freshwater. People need water for drinking, cooking, and bathing.

Biomass Energy

Biomass is any material that comes from plants or microorganisms that were recently living. Plants create energy from the sun through photosynthesis . This energy is stored in the plants even after they die.

Trees, branches, scraps of bark, and recycled paper are common sources of biomass energy. Manure, garbage, and crops , such as corn, soy, and sugar cane, can also be used as biomass feedstocks .

We get energy from biomass by burning it. Wood chips, manure, and garbage are dried out and compressed into squares called “briquettes.” These briquettes are so dry that they do not absorb water. They can be stored and burned to create heat or generate electricity.

Biomass can also be converted into biofuel . Biofuels are mixed with regular gasoline and can be used to power cars and trucks. Biofuels release less harmful pollutants than pure gasoline.

Advantages and Disadvantages A major advantage of biomass is that it can be stored and then used when it is needed.

Growing crops for biofuels, however, requires large amounts of land and pesticides . Land could be used for food instead of biofuels. Some pesticides could pollute the air and water.

Biomass energy can also be a nonrenewable energy source. Biomass energy relies on biomass feedstocks—plants that are processed and burned to create electricity. Biomass feedstocks can include crops, such as corn or soy, as well as wood. If people do not replant biomass feedstocks as fast as they use them, biomass energy becomes a non-renewable energy source.

Hydroelectric Energy

Hydroelectric energy is made by flowing water. Most hydroelectric power plants are located on large dams , which control the flow of a river.

Dams block the river and create an artificial lake, or reservoir. A controlled amount of water is forced through tunnels in the dam. As water flows through the tunnels, it turns huge turbines and generates electricity.

Advantages and Disadvantages Hydroelectric energy is fairly inexpensive to harness. Dams do not need to be complex, and the resources to build them are not difficult to obtain. Rivers flow all over the world, so the energy source is available to millions of people.

Hydroelectric energy is also fairly reliable. Engineers control the flow of water through the dam, so the flow does not depend on the weather (the way solar and wind energies do).

However, hydroelectric power plants are damaging to the environment. When a river is dammed, it creates a large lake behind the dam. This lake (sometimes called a reservoir) drowns the original river habitat deep underwater. Sometimes, people build dams that can drown entire towns underwater. The people who live in the town or village must move to a new area.

Hydroelectric power plants don’t work for a very long time: Some can only supply power for 20 or 30 years. Silt , or dirt from a riverbed, builds up behind the dam and slows the flow of water.

Other Renewable Energy Sources

Scientists and engineers are constantly working to harness other renewable energy sources. Three of the most promising are tidal energy , wave energy , and algal (or algae) fuel.

Tidal energy harnesses the power of ocean tides to generate electricity. Some tidal energy projects use the moving tides to turn the blades of a turbine. Other projects use small dams to continually fill reservoirs at high tide and slowly release the water (and turn turbines) at low tide.

Wave energy harnesses waves from the ocean, lakes, or rivers. Some wave energy projects use the same equipment that tidal energy projects do—dams and standing turbines. Other wave energy projects float directly on waves. The water’s constant movement over and through these floating pieces of equipment turns turbines and creates electricity.

Algal fuel is a type of biomass energy that uses the unique chemicals in seaweed to create a clean and renewable biofuel. Algal fuel does not need the acres of cropland that other biofuel feedstocks do.

Renewable Nations

These nations (or groups of nations) produce the most energy using renewable resources. Many of them are also the leading producers of nonrenewable energy: China, European Union, United States, Brazil, and Canada

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In a World on Fire, Stop Burning Things

On the last day of February, the Intergovernmental Panel on Climate Change issued its most dire report yet. The Secretary-General of the United Nations, António Guterres, had, he said, “seen many scientific reports in my time, but nothing like this.” Setting aside diplomatic language, he described the document as “an atlas of human suffering and a damning indictment of failed climate leadership,” and added that “the world’s biggest polluters are guilty of arson of our only home.” Then, just a few hours later, at the opening of a rare emergency special session of the U.N. General Assembly, he catalogued the horrors of Vladimir Putin’s invasion of Ukraine , and declared, “Enough is enough.” Citing Putin’s declaration of a nuclear alert , the war could, Guterres said, turn into an atomic conflict, “with potentially disastrous implications for us all.”

What unites these two crises is combustion. Burning fossil fuel has driven the temperature of the planet ever higher, melting most of the sea ice in the summer Arctic, bending the jet stream , and slowing the Gulf Stream. And selling fossil fuel has given Putin both the money to equip an army (oil and gas account for sixty per cent of Russia’s export earnings) and the power to intimidate Europe by threatening to turn off its supply. Fossil fuel has been the dominant factor on the planet for centuries, and so far nothing has been able to profoundly alter that. After Putin invaded, the American Petroleum Institute insisted that our best way out of the predicament was to pump more oil. The climate talks in Glasgow last fall, which John Kerry, the U.S. envoy, had called the “last best hope” for the Earth, provided mostly vague promises about going “net-zero by 2050”; it was a festival of obscurantism, euphemism, and greenwashing, which the young climate activist Greta Thunberg summed up as “blah, blah, blah.” Even people trying to pay attention can’t really keep track of what should be the most compelling battle in human history.

So let’s reframe the fight. Along with discussing carbon fees and green-energy tax credits, amid the momentary focus on disabling Russian banks and flattening the ruble, there’s a basic, underlying reality: the era of large-scale combustion has to come to a rapid close. If we understand that as the goal, we might be able to keep score, and be able to finally get somewhere. Last Tuesday, President Biden banned the importation of Russian oil. This year, we may need to compensate for that with American hydrocarbons, but, as a senior Administration official put it ,“the only way to eliminate Putin’s and every other producing country’s ability to use oil as an economic weapon is to reduce our dependency on oil.” As we are one of the largest oil-and-gas producers in the world, that is a remarkable statement. It’s a call for an end of fire.

We don’t know when or where humans started building fires; as with all things primordial there are disputes. But there is no question of the moment’s significance. Fire let us cook food, and cooked food delivers far more energy than raw; our brains grew even as our guts, with less processing work to do, shrank. Fire kept us warm, and human enterprise expanded to regions that were otherwise too cold. And, as we gathered around fires, we bonded in ways that set us on the path to forming societies. No wonder Darwin wrote that fire was “the greatest discovery ever made by man, excepting language.”

Darwin was writing in the years following the Industrial Revolution, as we learned how to turn coal into steam power, gas into light, and oil into locomotion, all by way of combustion. Our species depends on combustion; it made us human, and then it made us modern. But, having spent millennia learning to harness fire, and three centuries using it to fashion the world we know, we must spend the next years systematically eradicating it. Because, taken together, those blazes—the fires beneath the hoods of 1.4 billion vehicles and in the homes of billions more people, in giant power plants, and in the boilers of factories and the engines of airplanes ships—are more destructive than the most powerful volcanoes, dwarfing Krakatoa and Tambora. The smoke and smog from those engines and appliances directly kill nine million people a year, more deaths than those caused by war and terrorism, not to mention malaria and tuberculosis, together. (In 2020, fossil-fuel pollution killed three times as many people as COVID -19 did.) Those flames, of course, also spew invisible and odorless carbon dioxide at an unprecedented rate; that CO 2 is already rearranging the planet’s climate, threatening not only those of us who live on it now but all those who will come after us.

But here’s the good news, which makes this exercise more than merely rhetorical: rapid advances in clean-energy technology mean that all that destruction is no longer necessary. In the place of those fires we keep lit day and night, it’s possible for us to rely on the fact that there is a fire in the sky—a great ball of burning gas about ninety-three million miles away, whose energy can be collected in photovoltaic panels, and which differentially heats the Earth, driving winds whose energy can now be harnessed with great efficiency by turbines. The electricity they produce can warm and cool our homes, cook our food, and power our cars and bikes and buses. The sun burns, so we don’t need to.

Wind and solar power are not a replacement for everything, at least not yet. Three billion people still cook over fire daily, and will at least until sufficient electricity reaches them, and perhaps thereafter, since culture shifts slowly. Even then, flames will still burn—for birthday-cake candles, for barbecues, for joints (until you’ve figured out the dosing for edibles)—just as we still use bronze, though its age has long passed. And there are a few larger industries—intercontinental air travel, certain kinds of metallurgy such as steel production—that may require combustion, probably of hydrogen, for some time longer. But these are relatively small parts of the energy picture. And in time they, too, will likely be replaced by renewable electricity. (Electric-arc furnaces are already producing some kinds of steel, and Japanese researchers have just announced a battery so light that it might someday power passenger flights across oceans.) In fact, I can see only one sublime, long-term use for large-scale planned combustion, which I will get to. Mostly, our job as a species is clear: stop smoking.

As of 2022, this task is both possible and affordable. We have the technology necessary to move fast, and deploying it will save us money. Those are the first key ideas to internalize. They are new and counterintuitive, but a few people have been working to realize them for years, and their stories make clear the power of this moment.

When Mark Jacobson was growing up in northern California in the nineteen-seventies, he showed a gift for science, and also for tennis. He travelled for tournaments to Los Angeles and San Diego, where, he told me recently, he was shocked by how dirty the air was: “You’d get scratchy eyes, your throat would start hurting. You couldn’t see very far. I thought, Why should people live like this?” He eventually wound up at Stanford, first as an undergraduate and then, in the mid-nineteen-nineties, as a professor of civil and environmental engineering, by which time it was clear that visible air pollution was only part of the problem. It was understood that the unseen gas produced by combustion—carbon dioxide—posed an even more comprehensive threat.

To get at both problems, Jacobson analyzed data to see if an early-model wind turbine sold by General Electric could compete with coal. He worked out its capacity by calculating its efficiency at average wind speeds; a paper he wrote, published in the journal Science in 2001, showed that you “could get rid of sixty per cent of coal in the U.S. with a modest number of turbines.” It was, he said, “the shortest paper I’ve ever written—three-quarters of a page in the journal—and it got the most feedback, almost all from haters.” He ignored them; soon he had a graduate student mapping wind speeds around the world, and then he expanded his work to other sources of renewable energy. In 2009, he and Mark Delucchi, a research scientist at the University of California, published a paper suggesting that hydroelectric, wind, and solar energy could conceivably supply enough power to meet all the world’s energy needs. The conventional wisdom at the time was that renewables were unreliable, because the sun insists on setting each night and the wind can turn fickle. In 2015, Jacobson wrote a paper for the Proceedings of the National Academy of Sciences , showing that, on the contrary, wind and solar energy could keep the electric grid running. That paper won a prestigious prize from the editors of the journal, but it didn’t prevent more pushback—a team of twenty academics from around the country published a rebuttal, stating that “policy makers should treat with caution any visions of a rapid, reliable, and low-cost transition to entire energy systems that relies almost exclusively on wind, solar, and hydroelectric power.”

Time, however, is proving Jacobson correct: a few nations—including Iceland, Costa Rica, Namibia, and Norway—are already producing more than ninety per cent of their electricity from clean sources. When Jacobson began his work, wind turbines were small fans atop California ridgelines, whirligigs that looked more like toys than power sources. Now G.E. routinely erects windmills about three times as tall as the Statue of Liberty, and, in August, a Chinese firm announced a new model, whose blades will sweep an area the size of six soccer fields, with each turbine generating enough power for twenty thousand homes. (An added benefit: bigger turbines kill fewer birds than smaller ones, though, in any event, tall buildings, power lines, and cats are responsible for far more avian deaths.) In December, Jacobson’s Stanford team published an updated analysis , stating that we have ninety-five per cent of the technology required to produce a hundred per cent of America’s power needs from renewable energy by 2035, while keeping the electric grid secure and reliable.

Making clean technology affordable is the other half of the challenge, and here the news is similarly upbeat. In September, after almost fifteen years of work, a team of researchers at Oxford University released a paper that is currently under peer review but which, fifty years from now, people may look back on as a landmark step in addressing the climate crisis. The lead author of the report is Oxford’s Rupert Way; the research team was led by an American named Doyne (pronounced “ dough -en”) Farmer.

Farmer grew up in New Mexico, a precocious physicist and mathematician. His first venture, formed while he was a graduate student at U.C. Santa Cruz, was called Eudaemonic Enterprises, after Aristotle’s term for the condition of human flourishing. The goal was to beat roulette wheels. Farmer wore a shoe (now housed in a German museum) with a computer in its sole, and watched as a croupier tossed a ball into a wheel; noting the ball’s initial position and velocity, he tapped his toe to send the information to the computer, which performed quick calculations, giving him a chance to make a considered bet in the few seconds the casino allowed. This achievement led him to building algorithms to beat the stock market—a statistical-arbitrage technique that underpinned an enterprise he co-founded called the Prediction Company, which was eventually sold to the Swiss banking giant UBS. Happily, Farmer eventually turned his talents to something of greater social worth: developing a way to forecast rates of technological progress. The basis for this work was research published in 1936, when Theodore Wright, an executive at the Curtiss Aeroplane Company, had noted that every time the production of airplanes doubled, the cost of building them fell by twenty per cent. Farmer and his colleagues were intrigued by this “learning curve” (and its semiconductor-era variant, Moore’s Law ); if you could figure out which technologies fit on the curve, and which didn’t, you’d be able to forecast the future.

“It was about fifteen years ago,” Farmer told me, in December. “I was at the Santa Fe Institute, and the head of the National Renewable Energy Lab came down. He said, ‘You guys are complex-systems people. Help us think outside the box—what are we missing?’ I had a Transylvanian postdoctoral fellow at the time, and he started putting together a database—he had high-school kids working on it, kids from St. John’s College in Santa Fe, anyone. And, as we looked at it, we saw this point about the improvement trends being persistent over time.” The first practical application of solar electricity was on the Vanguard I satellite, in 1958—practical if you had the budget of the space program. Yet the cost had been falling steadily, as people improved each generation of the technology—not because of one particular breakthrough or a single visionary entrepreneur but because of constant incremental improvement. Every time the number of solar panels manufactured doubles, the price drops another thirty per cent, which means that it’s currently falling about ten per cent every year.

But—and here’s the key—not all technologies follow this curve. “We looked at the price of coal over a hundred and forty years,” Farmer said. “Mines are much more sophisticated, the technology for locating new deposits is much better. But prices have not come down.” A likely explanation is that we got to all the easy stuff first: oil once bubbled up out of the ground; now we have to drill deep beneath the ocean for it. Whatever the reason, by 2013, the cost of a kilowatt-hour of solar energy had fallen by more than ninety-nine per cent since it was first used on the Vanguard I. Meanwhile, the price of coal has remained about the same. It was cheap to start, but it hasn’t gotten cheaper.

The more data sets that Farmer’s team members included, the more robust numbers they got, and by the autumn of 2021 they were ready to publish their findings. They found that the price trajectories of fossil fuels and renewables are already crossing. Renewable energy is now cheaper than fossil fuel, and becoming more so. So a “decisive transition” to renewable energy, they reported, would save the world twenty-six trillion dollars in energy costs in the coming decades.

This is precisely the opposite of how we have viewed energy transition. It has long been seen as an economically terrifying undertaking: if we had to transition to avoid calamity (and obviously we did), we should go as slowly as possible. Bill Gates, just last year, wrote a book, arguing that consumers would need to pay a “green premium” for clean energy because it would be more expensive. But Emily Grubert, a Georgia Tech engineer who now works for the Department of Energy, has recently shown that it could cost less to replace every coal plant in the country with renewables than to simply maintain the existing coal plants. You could call it a “green discount.”

The constant price drops mean, Farmer said, that we might still be able to move quickly enough to meet the target set in the 2016 Paris climate agreement of trying to limit temperature rise to 1.5 degrees Celsius. “One point five is going to suck,” he said. “But it sure beats three. We just need to put our money down and do it. So many people are pessimistic and despairing, and we need to turn that around.”

Numbers like Farmer’s make people who’ve been working in this field for years absolutely giddy. At COP 26, I retreated one day from Glasgow’s giant convention center to the relative quiet of the city’s university district for a pizza with a man named Kingsmill Bond. Bond is an Englishman and a former investment professional, and he looks the part: lean, in a bespoke suit, with a good haircut. His daughter, he said, was that day sitting her exams for Cambridge, the university he’d attended before a career at Citi and Deutsche Bank that had taken him to Hong Kong and Moscow. He’d quit some years ago, taking a cut in pay that he’s too modest to disclose. He’d worked first for the Carbon Tracker Initiative, in London, and now the Rocky Mountain Institute, based in Colorado, two groups working on energy transition.

He drew on a napkin excitedly, expounding on the numbers in the Oxford report. We would have to build out the electric grid to carry all the new power, and install millions of E.V. chargers, and so on, down a long list—amounting to maybe a trillion dollars in extra capital expenditure a year over the next two or three decades. But, in return, Bond said, we get an economic gift: “We save about two trillion dollars a year on fossil-fuel rents. Forever.” Fossil-fuel rent is what economists call the money that goes from consumers to those who control the hydrocarbon supply. Saudi Arabia can pull oil out of the ground for less than ten dollars a barrel and sell it at fifty or seventy-five dollars a barrel (or, during the emergency caused by Putin’s war, more than a hundred dollars); the difference is the rent they command. Bond insists that higher projections for the cost of the energy transition—a recent analysis from the consulting firm McKinsey predicted that it would cost trillions more than Farmer’s team did—ignore these rents, and also assume that, before long, renewable energy will veer from the steeply falling cost curve. Even if you’re pessimistic about how much it will cost to make the change, though, it’s clear that it would be far less expensive than not moving fast—that’s measured in hundreds of trillions of dollars but also in millions of lives and whatever value we place on maintaining an orderly civilization.

The new numbers turn the economic logic we’re used to upside down. A few years ago, at a petroleum-industry conference in Texas, the Canadian Prime Minister, Justin Trudeau, said something both terrible and true: that “no country would find a hundred and seventy-three billion barrels of oil in the ground and leave them there.” He was referring to Alberta’s tar sands, where a third of Canada’s natural gas is used to heat the oil trapped in the soil sufficiently to get it to flow to the surface and separate it from the sand. Just extracting the oil would put Canada over its share of the carbon budget set in Paris, and actually burning it would heat the planet nearly half a degree Celsius and use up about a third of the total remaining budget. (And Canadians account for only about one half of one per cent of the world’s population.)

Even on purely economic terms, such logic makes less sense with each passing quarter. That’s especially true for the eighty per cent of people in the world who live in countries that must import fossil fuels—for them it’s all cost and no gain. Even for petrostates, however, the spreadsheet is increasingly difficult to rationalize. Bond supplied some numbers: Canada has fossil-fuel reserves totalling a hundred and sixty-seven petawatt hours, which is a lot. (A petawatt is a quadrillion watts.) But, he said, it has potential renewable energy from wind and solar power alone of seventy-one petawatt hours a year . A reasonable question to ask Trudeau would be: What kind of country finds a windfall like that and simply leaves it in the sky?

Making the energy transition won’t be easy, of course. Because we’ve been burning fuel to power our economies for more than two hundred years, we have in place long and robust supply chains and deep technical expertise geared to a combustion economy. “We’ve tried to think about possible infrastructure walls that might get in the way,” Farmer said. That’s a virtue of this kind of learning-curve analysis: if renewable energy has overcome obstacles in the past to keep dropping in price, it will probably be able to do so again. A few years ago, for instance, a number of reports said that the windmill business might crash because it was running short of the balsa wood used in turbine blades. But, within a year of the shortages emerging, many of the big windmill makers had started substituting a synthetic foam.

Now the focus is on minerals, such as cobalt, that are used in solar panels and batteries. Late last year, the Times published a long investigation of the success that China has had in cornering the world’s supply of the metal, which is found most abundantly in the Democratic Republic of the Congo. Brian Menell, the C.E.O. of TechMet, a supplier of cobalt and other specialty metals, told me, “We run the risk that in five years, the factories for E.V.s will be sitting half idle, because those companies—the Fords and General Motors and Teslas and VWs—will not be able to secure the feedstock to maintain the capacity they’re building now.” But the fact that the Fords and G.M.s are in the hunt means that the political weight for what Menell calls a “massive and coördinated effort by government and end users” is likely to develop. Humans are good at solving the kind of dilemmas represented by scarcity. A Ford spokesman told the Times that the company is learning to recycle cobalt and to develop substitutes, adding, “We do not see cobalt as a constraining issue.”

Harder to solve may be the human-rights challenges that come with new mining efforts, such as the use of so-called “artisanal” cobalt mining, in which impoverished workers pry the metal from the ground with spades, or the plan to build a lithium mine on a site in Nevada that is sacred to Indigenous peoples. But, as we work to tackle those problems, it’s worth remembering that a transition to renewable energy would, by some estimates, reduce the total global mining burden by as much as eighty per cent, because so much of what we dig up today is burned (and then we have to go dig up some more). You dig up lithium once, and put it to use for decades in a solar panel or battery. In fact, a switch to renewable energy will reduce the load on all kinds of systems. At the moment, roughly forty per cent of the cargo carried by ocean-going ships is coal, gas, oil, and wood pellets—a never-ending stream of vessels crammed full of stuff to burn. You need a ship to carry a wind turbine blade, too, if it’s coming from across the sea, but you only need it once. A solar panel or a windmill, once erected, stands for a quarter of a century or longer. The U.S. military is the world’s largest single consumer of fossil fuels, but seventy per cent of its logistical “lift capacity” is devoted solely to transporting the fossil fuels used to keep the military machine running.

Raw materials aren’t the only possible pinch point. We’re also short of some kinds of expertise. Saul Griffith is perhaps the world’s leading apostle of electrification. (His 2021 book is called “ Electrify .”) An Australian by birth, he has spent recent years in Silicon Valley, rallying entrepreneurs to the project of installing E.V. chargers, air-source heat pumps, induction cooktops, and the like. He can show that they save homeowners, landlords, and businesses money; he’s also worked out the numbers to show that banks can prosper by extending, in essence, mortgages for these improvements. But he told me that, to stay within the 1.5 degree Celsius range, “America is going to need a million more electricians this decade.” That’s not impossible . Working as an electrician is a good job, and community colleges and apprenticeship programs could train many more people to become one. But, as with the rest of the transition, it’s going to take leadership and coördination to make it happen.

Change on this scale would be difficult even if everyone was working in good faith, and not everyone is. So far, for instance, the climate provisions of the Build Back Better Act, which would help provide, among many other things, training for renewable-energy installers, have been blocked not just by the oil-dominated G.O.P. but by Joe Manchin , the Democrat who received more fossil-fuel donations in the past election cycle than anyone else in the Senate. The thirty-year history of the global-warming fight is largely a story of the efforts by the fossil-fuel industry to deny the need for change, or, more recently, to insist that it must come slowly.

The fossil-fuel industry wants to be able to keep burning something. That way, it can keep both its infrastructure and its business model usefully employed. It’s like an industry of rational pyromania. A decade or so ago, the thing it wanted to burn next was natural gas. Since it produces less carbon dioxide than coal does, it was billed as the “bridge fuel” that would get us to renewables. The logic seemed sound. But researchers, led by Bob Howarth, at Cornell University, found that producing large quantities of natural gas released large quantities of methane into the atmosphere. And methane (CH 4 ) is, like CO 2 , a potent heat-trapping gas, so it’s become clear that natural gas is a bridge fuel to nowhere—clear, that is, to everyone but the industry. The head of a big gas firm told a conference in Texas last week that he thought the domestic gas industry could be producing for the next hundred years.

Other parts of the industry want to go further back in time and burn wood; the European Union and the United States officially class “biomass burning” as carbon neutral. The city of Burlington, in my home state of Vermont, claims to source all its energy from renewables, but much of its electricity comes from a plant that burns trees. Again, the logic originally seemed sound: if you cut a tree, another grows in its place, and it will eventually soak up the carbon dioxide emitted from that burning the first tree. But, again, “eventually” is the problem . Burning wood is highly inefficient, and so it releases a huge pulse of carbon right now , when the world’s climate system is most vulnerable. Trees that grow back in a few generations’ time will come too late to save the ice caps. The world’s largest wood-burning plant is in England, run by a company called Drax; the plant used to burn coal, and it does scarcely less damage now than it did then. In January, news came that Enviva, a company based in Maryland that is the largest producer of wood pellets in the world, plans to double its output.

Or consider the huge sums of money in the bipartisan infrastructure bill passed last year, which will support another technology called carbon capture. This involves fitting power plants with enough filters and pipes so that they can go on burning coal or gas, but capture the CO 2 that pours out of the smokestacks and pipe it safely away—into an old salt mine, perhaps. (Or, ironically, into a depleted oil well, where it may be used to push more crude to the surface.) So far, these carbon-capture schemes don’t really work—but, even if they did, why spend the money to outfit systems with pipes and filters when solar power is already cheaper than coal power? We will have to remove some of the carbon in the atmosphere, and new generations of direct-air-capture machines may someday play a role, if their cost drops quickly. (They use chemicals to filter carbon straight from the ambient air; think of them as artificial trees.) But using this technology to lengthen the lifespan of coal-fired power plants is just one more gift to a politically connected industry.

Increasingly, the fossil-fuel industry is turning toward hydrogen as an out. Hydrogen does burn cleanly, without contributing to global warming, but the industry likes hydrogen because one way to produce it is by burning natural gas. And, as Howarth and Jacobson demonstrated in a recent paper, even if you combine burning that gas with expensive carbon capture, the methane that leaks from the frack wells is enough to render the whole process ruinous environmentally, and it makes no sense economically without huge subsidies.

There is another way to produce hydrogen, and, in time, it will almost certainly fuel the last big artificial fires on our planet. Through electrolysis, hydrogen can be separated from oxygen in water. And if the electricity used in the process is renewably produced then this “green hydrogen” would allow countries such as Japan, Singapore, and Korea, which may struggle to find enough space in their landscapes for renewable-energy generation, to power their grids. The Australian billionaire Andrew Forrest, the founder of the Fortescue Metals Group, is proposing to use solar power to produce green hydrogen that he can then ship to those countries. In January, Mukesh Ambani, the head of Reliance Industries and the richest man in India, announced plans to spend seventy-five billion dollars on the technology. Airbus recently predicted that green hydrogen could fuel its long-haul planes by 2035. And the good news—though Doyne Farmer cautions that the data sets are still pretty scanty—is that the electrolyzers which use solar energy to produce hydrogen seem to be on the same downward cost curve as solar panels, wind turbines, and batteries.

The fossil-fuel industry can be relied on to fight these shifts. Last autumn, a utility company in Oklahoma announced that it would charge fourteen hundred dollars to disconnect residential gas lines and move home stoves and furnaces to electricity. Within days, other utilities followed suit. That’s why the climate movement is increasingly taking on the banks that make loans for the expansion of fossil-fuel infrastructure. Last year, the International Energy Agency said that such expansion needed to end immediately if we are to meet the Paris targets, yet the world’s biggest banks, while making noises about “net zero by 2050,” continue to lend to new pipelines and wells. The issue came to the fore earlier this year, when Joe Biden nominated Sarah Bloom Raskin to the position of vice-chair for supervision at the Federal Reserve. “There is opportunity in pre-emptive, early and bold actions by federal economic policy makers looking to avoid catastrophe,” Raskin wrote in 2020. And it’s why certain lawmakers mobilized to stop her nomination . Senator Patrick Toomey, of Pennsylvania, who was the Senate’s sixth-biggest recipient of oil-and-gas contributions during his last campaign, in 2016 (he is not running for reëlection this year), said that Raskin “has specifically called for the Fed to pressure banks to choke off credit to traditional energy companies.” She’s tried, in other words, to extinguish the flames a little—and on Monday, for her pains, Manchin effectively derailed her nomination, saying that he would vote against her, because she “failed to satisfactorily address my concerns about the critical importance of financing an all-of-the-above energy policy.” On Tuesday, she withdrew her nomination .

The shift away from combustion is large and novel enough that it bumps up against everyone’s prior assumptions—environmentalists’, too. The fight against nuclear power, for example, was an early mainstay of the green movement, because it was easy to see that if something went wrong it could go badly wrong. I applauded, more than a decade ago, when the Vermont legislature voted to close the state’s old nuclear plant at the end of its working life, but I wouldn’t today. Indeed, for some years I’ve argued that existing nuclear reactors that can still be run with any margin of safety probably should be, as we’re making the transition—the spent fuel they produce is an evil inheritance for our descendants, but it’s not as dangerous as an overheated Earth, even if the scenes of Russian troops shelling nuclear plants added to the sense of horror enveloping the planet these past weeks. Yet the rapidly falling cost of renewables also indicates why new nuclear plants will have a hard time finding backers; it’s evaporating nuclear power’s one big advantage—that it’s always on. Farmer’s Oxford team ran the numbers. “If the cost of coal is flat, and the cost of solar is plummeting, nuclear is the rare technology whose cost is going up,” he said. Advocates will argue that this is because safety fears have driven up the cost of construction. “But the only place on Earth where you can find the cost of nuclear coming down is Korea,” Farmer said. “Even there, the rate of decline is one per cent a year. Compared to ten per cent for renewables, that’s not enough to matter.”

Accepting nuclear power for a while longer is not the only place environmentalists will need to bend. A reason I supported shutting down Vermont’s nuclear plant was because campaigners had promised that its output would be replaced with renewable energy. In the years that followed, though, advocates of scenery, wildlife, and forests managed to put the state’s mountaintops off limits to wind turbines. More recently, the state’s public-utility commission blocked construction of an eight-acre solar farm on aesthetic grounds. Those of us who live in and love rural areas have to accept that some of that landscape will be needed to produce energy. Not all of it, or even most of it—Jacobson’s latest numbers show that renewable power actually uses less land than fossil fuels, which require drilling fifty thousand new holes every year in North America alone. But we do need to see our landscape differently—as Ezra Klein wrote this week in the Times , “to conserve anything close to the climate we’ve had, we need to build as we’ve never built before.”

Corn fields, for instance, are a classic American sight, but they’re also just solar-energy collectors of another sort. (And ones requiring annual applications of nitrogen, which eventually washes into lakes and rivers, causing big algae blooms.) More than half the corn grown in Iowa actually ends up as ethanol in the tanks of cars and trucks—in other words, those fields are already growing fuel, just inefficiently. Because solar panels are far more efficient than photosynthesis, and because E.V.s are far more efficient than cars with gas engines, Jacobson’s data show that, by switching from ethanol to solar, you could produce eighty times the amount of automobile mileage using an equivalent area of land. And the transition could bring some advantages: the market for electrons is predictable, so solar panels can provide a fairly stable income for farmers, some of whom are learning to grow shade-tolerant crops or to graze animals around and beneath them.

Another concession will strike many environmentalists more deeply even than accepting a degraded landscape, and that’s the notion that reckoning with the climate crisis would force wholesale changes in the way that people live their lives. Remember, the long-held assumption was that renewable energy was going to be expensive and limited in supply. So, it was thought, this would move us in the direction of simpler, less energy-intensive ways of life, something that many of us welcomed, in part because there are deep environmental challenges that go beyond carbon and climate. Cheap new energy technologies may let us evade some of those more profound changes. Whenever I write about the rise of E.V.s, Twitter responds that we’d be better off riding bikes and electric buses. In many ways we would be, and some cities are thankfully starting to build extensive bike paths and rapid-transit lanes for electric buses. But, as of 2017, just two per cent of passenger miles in this country come from public transportation. Bike commuting has doubled in the past two decades—to about one per cent of the total. We could (and should) quintuple the number of people riding bikes and buses, and even then we’d still need to replace tens of millions of cars with E.V.s to meet the targets in the time the scientists have set to meet them. That time is the crucial variable. As hard as it will be to rewire the planet’s energy system by decade’s end, I think it would be harder—impossible, in fact—to sufficiently rewire social expectations, consumer preferences, and settlement patterns in that short stretch.

So one way to look at the work that must be done with the tools we have at hand is as triage. If we do it quickly, we will open up more possibilities for the generations to come. Just one example: Farmer says that it’s possible to see the cost of nuclear-fusion reactors, as opposed to the current fission reactors, starting to come steeply down the cost curve—and to imagine that a within a generation or two people may be taking solar panels off farm fields, because fusion (which is essentially the physics of the sun brought to Earth) may be providing all the power we need. If we make it through the bottleneck of the next decade, much may be possible.

There is one ethical element of the energy transition that we can’t set aside: the climate crisis is deeply unfair—by and large, the less you did to cause it, the harder and faster it hits you—but in the course of trying to fix it we do have an opportunity to also remedy some of that unfairness. For Americans, the best part of the Build Back Better bill may be that it tries to target significant parts of its aid to communities hardest hit by poverty and environmental damage, a residue of the Green New Deal that is its parent. And advocates are already pressing to insure that at least some of the new technology is owned by local communities—by churches and local development agencies, not by the solar-era equivalents of Koch Industries or Exxon.

Advocates are also calling for some of the first investments in green transformations to happen in public-housing projects, on reservations, and in public schools serving low-income students. There can be some impatience from environmentalists who worry that such considerations might slow down the transition. But, as Naomi Klein recently told me, “The hard truth is that environmentalists can’t win the emission-reduction fight on our own. Winning will take sweeping alliances beyond the self-identified green bubble—with trade unions, housing-rights advocates, racial-justice organizers, teachers, transit workers, nurses, artists, and more. But, to build that kind of coalition, climate action needs to hold out the promise of making daily life better for the people who are most neglected right away—not far off in the future. Green, affordable homes and water that is safe to drink is something people will fight for a hell of a lot harder than carbon pricing.”

These are principles that must apply around the world, for basic fairness and because solving the climate crisis in just the U.S. would be the most pyrrhic of victories. (They don’t call it “global warming” for nothing.) In Glasgow, I sat down with Mohamed Nasheed, the former President of the Maldives and the current speaker of the People’s Majlis, the nation’s legislative body. He has been at the forefront of climate action for decades, because the highest land in his country, an archipelago that stretches across the equator in the Indian Ocean, is just a few metres above sea level. At COP 26, he was representing the Climate Vulnerable Forum, a consortium of fifty-five of the nations with the most to lose as temperatures rise. As he noted, poor countries have gone deeply into debt trying to deal with the effects of climate change. If they need to move an airport or shore up seawalls, or recover from a devastating hurricane or record rainfall, borrowing may be their only recourse. And borrowing gets harder, in part, because the climate risks mean that lenders demand more. The climate premium on loans may approach ten per cent, Nasheed said; some nations are already spending twenty per cent of their budgets just paying interest. He suggested that it might be time for a debt strike by poor nations.

The rapid fall in renewable-energy prices makes it more possible to imagine the rest of the world chipping in. So far, though, the rich countries haven’t even come up with the climate funds they promised the Global South more than a decade ago, much less any compensation for the ongoing damage that they have done the most to cause. (All of sub-Saharan Africa is responsible for less than two per cent of the carbon emissions currently heating the earth; the United States is responsible for twenty-five per cent.)

Tom Athanasiou’s Berkeley-based organization EcoEquity, as part of the Climate Equity Reference Project, has done the most detailed analyses of who owes what in the climate fight. He found that the U.S. would have to cut its emissions a hundred and seventy-five per cent to make up for the damage it’s already caused—a statistical impossibility. Therefore, the only way it can meet that burden is to help the rest of the world transition to clean energy, and to help bear the costs that global warming has already produced. As Athanasiou put it, “The pressing work of decarbonization is only going to be embraced by the people of the Global South if it comes as part of a package that includes adaptation aid and disaster relief.”

I said at the start that there is one sublime exception to the rule that we should be dousing fires, and that is the use of flame to control flame, and to manage land—a skill developed over many millennia by the original inhabitants of much of the world. Of all the fires burning on Earth, none are more terrifying than the conflagrations that light the arid West, the Mediterranean, the eucalyptus forests of Australia, and the boreal woods of Siberia and the Canadian north. By last summer, blazes in Oregon and Washington and British Columbia were fouling the air across the continent in New York and New England. Smoke from fires in the Russian far north choked the sky above the North Pole. For people in these regions, fire has become a scary psychological companion during the hot and dry months—and those months stretch out longer each year. The San Francisco Chronicle recently asked whether parts of California, once the nation’s idyll, were now effectively uninhabitable. In Siberia, even last winter’s icy cold was not enough to blot out the blazes; researchers reported “zombie fires” smoking and smoldering beneath feet of snow. There’s no question that the climate crisis is driving these great blazes—and also being driven by them, since they put huge clouds of carbon into the air.

There’s also little question, at least in the West, that the fires, though sparked by our new climate, feed on an accumulation of fuel left there by a century of a strict policy which treated any fire as a threat to be extinguished immediately. That policy ignored millennia of Indigenous experience using fire as a tool, an experience now suddenly in great demand. Indigenous people around the world have been at the forefront of the climate movement, and they have often been skilled early adopters of renewable energy. But they have also, in the past, been able to use fire to fight fire: to burn when the risk is low, in an effort to manage landscapes for safety and for productivity.

Frank Lake, a descendant of the Karuk tribe indigenous to what is now northern California, works as a research ecologist at the U.S. Forest Service, and he is helping to recover this old and useful technology. He described a controlled burn in the autumn of 2015 near his house on the Klamath River. “I have legacy acorn trees on my property,” he said—meaning the great oaks that provided food for tribal people in ages past—but those trees were hemmed in by fast-growing shrubs. “So we had twenty-something fire personnel there that day, and they had their equipment, and they laid hose. And I gave the operational briefing. I said, ‘We’re going to be burning today to reduce hazardous fuels. And also so we can gather acorns more easily, without the undergrowth, and the pests attacking the trees.’ My wife was there and my five-year-old son and my three-year-old daughter. And I lit a branch from a lightning-struck sugar pine—it conveys its medicine from the lightning—and with that I lit everyone’s drip torches, and then they went to work burning. My son got to walk hand-in-hand down the fire line with the burn boss.”

Lake’s work at the Forest Service involves helping tribes burn again. It’s not always easy; some have been so decimated by the colonial experience that they’ve lost their traditions. “Maybe they have two or three generations that haven’t been allowed to burn,” he said. There are important pockets of residual knowledge, often among elders, but they can be reluctant to share that knowledge with others, Lake told me, “fearful that it will be co-opted and that they’ll be kept out of the leadership and decision-making.” But, for half a decade, the Indigenous Peoples Burning Network—organized by various tribes, the Nature Conservancy, and government agencies, including the Forest Service—has slowly been expanding across the country. There are outposts in Oregon, Minnesota, New Mexico, and in other parts of the world. Lake has travelled to Australia to learn from aboriginal practitioners. “It’s family-based burning. The kids get a Bic lighter and burn a little patch of eucalyptus. The teen-agers a bigger area, adults much bigger swaths. I just saw it all unfold.” As that knowledge and confidence is recovered, it’s possible to imagine a world in which we’ve turned off most of the man-made fires, and Indigenous people teach the rest of us to use fire as the important force it was when we first discovered it.

Amy Cardinal Christianson, who works for the Canadian equivalent of the Forest Service, is a member of the Métis Nation. Her family kept trapping lines near Fort McMurray, in northern Alberta, but left them for the city because the development of the vast tar-sands complex overwhelmed the landscape. (That’s the hundred and seventy-three billion barrels that Justin Trudeau says no country would leave in the ground—a pool of carbon so vast the climate scientist James Hansen said that pumping it from the ground would mean “game over for the climate.”) The industrial fires it stoked have helped heat the Earth, and one result was a truly terrifying forest fire that overtook Fort McMurray in 2016, after a stretch of unseasonably high temperatures. The blaze forced the evacuation of eighty-eight thousand people, and became the costliest disaster in Canadian history.

“What we’re seeing now is bad fire,” Christianson said. “When we talk about returning fire to the landscape, we’re talking about good fire. I heard an elder describe it once as fire you could walk next to, fire of a low intensity.” Fire that builds a mosaic of landscapes that, in turn, act as natural firebreaks against devastating blazes; fire that opens meadows where wildlife can flourish. “Fire is a kind of medicine for the land. And it lets you carry out your culture—like, why you are in the world, basically.”

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This Is the Future: Essay on Renewable Energy

Today the world population depends on nonrenewable energy resources. With the constantly growing demand for energy, natural gas, coal, and oil get used up and cannot replenish themselves.

Aside from limited supply, heavy reliance on fossil fuels causes planetary-scale damage. Sea levels are rising. Heat-trapping carbon dioxide increased the warming effect by 45% from 1990 to 2019. The only way to tackle the crisis is to start the transition to renewable energy now.

What is renewable energy? It is energy that comes from replenishable natural resources like sunlight, wind, thermal energy, moving water, and organic materials. Renewable resources do not run out. They are cost-efficient and renew faster than they are consumed. How does renewable energy save money? It creates new jobs, supports economic growth, and decreases inequitable fossil fuel subsidies.

At the current rates of production, some fossil fuels will not even last another century. This is why the future depends on reliable and eco-friendly resources. This renewable energy essay examines the types and benefits of renewable energy and its role in creating a sustainable future.

Top 5 Types of Renewable Energy: The Apollo Alliance Rankings

There are many natural resources that can provide people with clean energy. To make a list of the five most booming types of renewable energy on the market today, this energy essay uses data gathered by the Apollo Alliance. It is a project that aims to revolutionize the energy sector of the US with a focus on clean energy.

The Apollo Alliance unites businesses, community leaders, and environmental experts to support the transition to more sustainable and efficient living. Their expert opinion helped to compile information about the most common and cost-competitive sources of renewable energy. However, if you want to get some more in-depth research, you can entrust it to an essay writer . Here’s a quick overview of renewable energy resources that have a huge potential to substitute fossil fuels.

Solar Renewable Energy

The most abundant and practically endless resource is solar energy. It can be turned into electricity by photovoltaic systems that convert radiant energy captured from sunlight. Solar farms could generate enough energy for thousands of homes.

An endless supply is the main benefit of solar energy. The rate at which the Earth receives it is 10,000 times greater than people can consume it, as a paper writer points out based on their analysis of research findings. It can substitute fossil fuels and deliver people electricity, hot water, cooling, heat, etc.

The upfront investment in solar systems is rather expensive. This is one of the primary limitations that prevent businesses and households from switching to this energy source at once. However, the conclusion of solar energy is still favorable. In the long run, it can significantly decrease energy costs. Besides, solar panels are gradually becoming more affordable to manufacture and adopt, even at an individual level.

Wind Renewable Energy

Another clean energy source is wind. Wind farms use the kinetic energy of wind flow to convert it into electricity. The Appolo Alliance notes that, unlike solar farms, they can’t be placed in any location. To stay cost-competitive, wind farms should operate in windy areas. Although not all countries have the right conditions to use them on a large scale, wind farms might be introduced for some energy diversity. The technical potential for it is still tremendous.

Wind energy is clean and safe for the environment. It does not pollute the atmosphere with any harmful products compared to nonrenewable energy resources.

The investment in wind energy is also economically wise. If you examine the cost of this energy resource in an essay on renewable resources, you’ll see that wind farms can deliver electricity at a price lower than nonrenewable resources. Besides, since wind isn’t limited, its cost won’t be influenced by the imbalance of supply and demand.

Geothermal Renewable Energy

Natural renewable resources are all around us, even beneath the ground. Geothermal energy can be produced from the thermal energy from the Earth’s interior. Sometimes heat reaches the surface naturally, for example, in the form of geysers. But it can also be used by geothermal power plants. The Earth’s heat gets captured and converted to steam that turns a turbine. As a result, we get geothermal energy.

This source provides a significant energy supply while having low emissions and no significant footprint on land. A factsheet and essay on renewable resources state that geothermal plants will increase electricity production from 17 billion kWh in 2020 to 49.8 billion kWh in 2050.

However, this method is not without limitations. While writing a renewable resources essay, consider that geothermal energy can be accessed only in certain regions. Geological hotspots are off-limits as they are vulnerable to earthquakes. Yet, the quantity of geothermal resources is likely to grow as technology advances.

Ocean Renewable Energy

The kinetic and thermal energy of the ocean is a robust resource. Ocean power systems rely on:

Changes in sea level;
Wave energy;
Water surface temperatures;
The energy released from seawater and freshwater mixing.

Ocean energy is more predictable compared to other resources. As estimated by EPRI, it has the potential to produce 2640 TWh/yr. However, an important point to consider in a renewable energy essay is that the kinetic energy of the ocean varies. Yet, since it is ruled by the moon’s gravity, the resource is plentiful and continues to be attractive for the energy industry.

Wave energy systems are still developing. The Apollo energy corporation explores many prototypes. It is looking for the most reliable and robust solution that can function in the harsh ocean environment.

Another limitation of ocean renewable energy is that it may cause disruptions to marine life. Although its emissions are minimal, the system requires large equipment to be installed in the ocean.

Biomass Renewable Energy

Organic materials like wood and charcoal have been used for heating and lighting for centuries. There are a lot more types of biomass: from trees, cereal straws, and grass to processed waste. All of them can produce bioenergy.

Biomass can be converted into energy through burning or using methane produced during the natural process of decomposition. In an essay on renewable sources of energy, the opponents of the method point out that biomass energy is associated with carbon dioxide emissions. Yet, the amount of released greenhouse gases is much lower compared to nonrenewable energy use.

While biomass is a reliable source of energy, it is only suitable for limited applications. If used too extensively, it might lead to disruptions in biodiversity, a negative impact on land use, and deforestation. Still, Apollo energy includes biomass resources that become waste and decompose quickly anyway. These are organic materials like sawdust, chips from sawmills, stems, nut shells, etc.

What Is the Apollo Alliance?

The Apollo Alliance is a coalition of business leaders, environmental organizations, labor unions, and foundations. They all unite their efforts in a single project to harness clean energy in new, innovative ways.

Why Apollo? Similarly to President John F. Kennedy’s Apollo Project, Apollo energy is a strong visionary initiative. It is a dare, a challenge. The alliance calls for the integrity of science, research, technology, and the public to revolutionize the energy industry.

The project has a profound message. Apollo energy solutions are not only about the environment or energy. They are about building a new economy. The alliance gives hope to building a secure future for Americans.

What is the mission of the Apollo Alliance?

Achieve energy independence with efficient and limitless resources of renewable energy.
Pioneer innovation in the energy sector.
Build education campaigns and communication to inspire new perceptions of energy.
Create new jobs.
Reduce dependence on imported fossil fuels.
Build healthier and happier communities.

The transformation of the industry will lead to planet-scale changes. The Apollo energy corporation can respond to the global environmental crisis and prevent climate change.

Apollo renewable energy also has the potential to become a catalyst for social change. With more affordable energy and new jobs in the industry, people can bridge the inequality divide and build stronger communities.

Why Renewable Energy Is Important for the Future

Renewable energy resources have an enormous potential to cover people’s energy needs on a global scale. Unlike fossil fuels, they are available in abundance and generate minimal to no emissions.

The burning of fossil fuels caused a lot of environmental problems—from carbon dioxide emissions to ocean acidification. Research this issue in more detail with academic assistance from essay writer online . You can use it to write an essay on renewable sources of energy to explain the importance of change and its global impact.

Despite all the damage people caused to the planet, there’s still hope to mitigate further repercussions. Every renewable energy essay adds to the existing body of knowledge we have today and advances research in the field. Here are the key advantages and disadvantages of alternative energy resources people should keep in mind.

Advantage of Green Energy

The use of renewable energy resources has a number of benefits for the climate, human well-being, and economy:

Renewable energy resources have little to no greenhouse gas emissions. Even if we take into account the manufacturing and recycling of the technologies involved, their impact on the environment is significantly lower compared to fossil fuels.
Renewable energy promotes self-sufficiency and reduces a country’s dependence on foreign fuel. According to a study, a 1% increase in the use of renewable energy increases economic growth by 0.21%. This gives socio-economic stability.
Due to a lack of supply of fossil fuels and quick depletion of natural resources, prices for nonrenewable energy keep increasing. In contrast, green energy is limitless and can be produced locally. In the long run, this allows decreasing the cost of energy.
Unlike fossil fuels, renewable energy doesn’t emit air pollutants. This positively influences health and quality of life.
The emergence of green energy plants creates new jobs. Thus, Apollo energy solutions support the growth of local communities. By 2030, the transition to renewable energy is expected to generate 10.3 million new jobs.
Renewable energy allows decentralization of the industry. Communities get their independent sources of energy that are more flexible in terms of distribution.
Renewable energy supports equality. It has the potential to make energy more affordable to low-income countries and expand access to energy even in remote and less fortunate neighborhoods.

Disadvantages of Non-Conventional Energy Sources

No technology is perfect. Renewable energy resources have certain drawbacks too:

The production of renewable energy depends on weather conditions. For example, wind farms could be effective only in certain locations where the weather conditions allow it. The weather also makes it so that renewable energy cannot be generated around the clock.
The initial cost of renewable energy technology is expensive. Both manufacturing and installation require significant investment. This is another disadvantage of renewable resources. It makes them unaffordable to a lot of businesses and unavailable for widespread individual use. In addition, the return on investment might not be immediate.
Renewable energy technology takes up a lot of space. It may affect life in the communities where these clean energy farms are installed. They may also cause disruptions to wildlife in the areas.
One more limitation a renewable resources essay should consider is the current state of technology. While the potential of renewable energy resources is tremendous, the technology is still in its development phase. Therefore, renewable energy might not substitute fossil fuels overnight. There’s a need for more research, investment, and time to transition to renewable energy completely. Yet, some diversity of energy resources should be introduced as soon as possible.
Renewable energy resources have limited emissions, but they are not entirely pollution-free. The manufacturing process of equipment is associated with greenhouse gas emissions while, for example, the lifespan of a wind turbine is only 20 years.

For high school seniors eyeing a future rich with innovative endeavors in renewable energy or other fields, it's crucial to seek financial support early on. Explore the top 10 scholarships for high school seniors to find the right fit that can propel you into a future where you can contribute to the renewable energy movement and beyond. Through such financial support, the road to making meaningful contributions to a sustainable future becomes a tangible reality.

Renewable energy unlocks the potential for humanity to have clean energy that is available in abundance. It leads us to economic growth, independence, and stability. With green energy, we can also reduce the impact of human activity on the environment and stop climate change before it’s too late.

So what’s the conclusion of renewable energy? Transitioning to renewable energy resources might be challenging and expensive. However, most experts agree that the advantages of green energy outweigh any drawbacks. Besides, since technology is continuously evolving, we’ll be able to overcome most limitations in no time.

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ENVIRONMENT

Renewable energy, explained

Solar, wind, hydroelectric, biomass, and geothermal power can provide energy without the planet-warming effects of fossil fuels.

In any discussion about climate change , renewable energy usually tops the list of changes the world can implement to stave off the worst effects of rising temperatures. That's because renewable energy sources such as solar and wind don't emit carbon dioxide and other greenhouse gases that contribute to global warming .

Clean energy has far more to recommend it than just being "green." The growing sector creates jobs , makes electric grids more resilient, expands energy access in developing countries, and helps lower energy bills. All of those factors have contributed to a renewable energy renaissance in recent years, with wind and solar setting new records for electricity generation .

For the past 150 years or so, humans have relied heavily on coal, oil, and other fossil fuels to power everything from light bulbs to cars to factories. Fossil fuels are embedded in nearly everything we do, and as a result, the greenhouse gases released from the burning of those fuels have reached historically high levels .

As greenhouse gases trap heat in the atmosphere that would otherwise escape into space, average temperatures on the surface are rising . Global warming is one symptom of climate change, the term scientists now prefer to describe the complex shifts affecting our planet’s weather and climate systems. Climate change encompasses not only rising average temperatures but also extreme weather events, shifting wildlife populations and habitats, rising seas , and a range of other impacts .

Of course, renewables—like any source of energy—have their own trade-offs and associated debates. One of them centers on the definition of renewable energy. Strictly speaking, renewable energy is just what you might think: perpetually available, or as the U.S. Energy Information Administration puts it, " virtually inexhaustible ." But "renewable" doesn't necessarily mean sustainable, as opponents of corn-based ethanol or large hydropower dams often argue. It also doesn't encompass other low- or zero-emissions resources that have their own advocates, including energy efficiency and nuclear power.

Types of renewable energy sources

Hydropower: For centuries, people have harnessed the energy of river currents, using dams to control water flow. Hydropower is the world's biggest source of renewable energy by far, with China, Brazil, Canada, the U.S., and Russia the leading hydropower producers . While hydropower is theoretically a clean energy source replenished by rain and snow, it also has several drawbacks.

Large dams can disrupt river ecosystems and surrounding communities , harming wildlife and displacing residents. Hydropower generation is vulnerable to silt buildup, which can compromise capacity and harm equipment. Drought can also cause problems. In the western U.S., carbon dioxide emissions over a 15-year period were 100 megatons higher than they normally would have been, according to a 2018 study , as utilities turned to coal and gas to replace hydropower lost to drought. Even hydropower at full capacity bears its own emissions problems, as decaying organic material in reservoirs releases methane.

Dams aren't the only way to use water for power: Tidal and wave energy projects around the world aim to capture the ocean's natural rhythms. Marine energy projects currently generate an estimated 500 megawatts of power —less than one percent of all renewables—but the potential is far greater. Programs like Scotland’s Saltire Prize have encouraged innovation in this area.

Wind: Harnessing the wind as a source of energy started more than 7,000 years ago . Now, electricity-generating wind turbines are proliferating around the globe, and China, the U.S., and Germany are the leading wind energy producers. From 2001 to 2017 , cumulative wind capacity around the world increased to more than 539,000 megawatts from 23,900 mw—more than 22 fold.

Some people may object to how wind turbines look on the horizon and to how they sound, but wind energy, whose prices are declining , is proving too valuable a resource to deny. While most wind power comes from onshore turbines, offshore projects are appearing too, with the most in the U.K. and Germany. The first U.S. offshore wind farm opened in 2016 in Rhode Island, and other offshore projects are gaining momentum . Another problem with wind turbines is that they’re a danger for birds and bats, killing hundreds of thousands annually , not as many as from glass collisions and other threats like habitat loss and invasive species, but enough that engineers are working on solutions to make them safer for flying wildlife.

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Solar: From home rooftops to utility-scale farms, solar power is reshaping energy markets around the world. In the decade from 2007 and 2017 the world's total installed energy capacity from photovoltaic panels increased a whopping 4,300 percent .

In addition to solar panels, which convert the sun's light to electricity, concentrating solar power (CSP) plants use mirrors to concentrate the sun's heat, deriving thermal energy instead. China, Japan, and the U.S. are leading the solar transformation, but solar still has a long way to go, accounting for around two percent of the total electricity generated in the U.S. in 2017. Solar thermal energy is also being used worldwide for hot water, heating, and cooling.

Biomass: Biomass energy includes biofuels such as ethanol and biodiesel , wood and wood waste, biogas from landfills, and municipal solid waste. Like solar power, biomass is a flexible energy source, able to fuel vehicles, heat buildings, and produce electricity. But biomass can raise thorny issues.

Critics of corn-based ethanol , for example, say it competes with the food market for corn and supports the same harmful agricultural practices that have led to toxic algae blooms and other environmental hazards. Similarly, debates have erupted over whether it's a good idea to ship wood pellets from U.S. forests over to Europe so that it can be burned for electricity. Meanwhile, scientists and companies are working on ways to more efficiently convert corn stover , wastewater sludge , and other biomass sources into energy, aiming to extract value from material that would otherwise go to waste.

Geothermal: Used for thousands of years in some countries for cooking and heating, geothermal energy is derived from the Earth’s internal heat . On a large scale, underground reservoirs of steam and hot water can be tapped through wells that can go a mile deep or more to generate electricity. On a smaller scale, some buildings have geothermal heat pumps that use temperature differences several feet below ground for heating and cooling. Unlike solar and wind energy, geothermal energy is always available, but it has side effects that need to be managed, such as the rotten egg smell that can accompany released hydrogen sulfide.

Ways to boost renewable energy

Cities, states, and federal governments around the world are instituting policies aimed at increasing renewable energy. At least 29 U.S. states have set renewable portfolio standards —policies that mandate a certain percentage of energy from renewable sources, More than 100 cities worldwide now boast at least 70 percent renewable energy, and still others are making commitments to reach 100 percent . Other policies that could encourage renewable energy growth include carbon pricing, fuel economy standards, and building efficiency standards. Corporations are making a difference too, purchasing record amounts of renewable power in 2018.

Wonder whether your state could ever be powered by 100 percent renewables? No matter where you live, scientist Mark Jacobson believes it's possible. That vision is laid out here , and while his analysis is not without critics , it punctuates a reality with which the world must now reckon. Even without climate change, fossil fuels are a finite resource, and if we want our lease on the planet to be renewed, our energy will have to be renewable.

5 environmental victories from 2021 that offer hope

Activists fear a new threat to biodiversity—renewable energy

How the Ukraine war is accelerating Germany's renewable energy transition

3 ways COVID-19 is making us rethink energy and emissions

Let’s not waste this crucial moment: We need to stop abusing the planet

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Essay on Renewable Energy

Introduction to Renewable Energy

In the quest for a sustainable and environmentally conscious future, adopting renewable energy has emerged as a pivotal solution to mitigate the challenges posed by traditional fossil fuels. Take, for instance, the remarkable growth of solar power in countries like Germany, where the “Energiewende” policy has catapulted them to the forefront of green energy innovation. This transformative journey showcases the potential of harnessing solar energy as an alternative and a cornerstone for economic prosperity, reduced carbon emissions, and heightened energy security. As we delve into the world of renewable energy, it becomes evident that these innovations are key to shaping a cleaner, more resilient global energy landscape.

Importance of Transitioning to Renewable Sources

A sustainable future and resolving numerous global issues depend heavily on the switch to renewable energy sources. This shift is crucial for several reasons:

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Environmental Preservation: Fossil fuel combustion contributes significantly to air and water pollution and climate change. Transitioning to renewables reduces greenhouse gas emissions, mitigates environmental degradation, and helps preserve ecosystems.
Climate Change Mitigation: Renewable energy is a key player in mitigating climate change . Reducing greenhouse gas emissions, including carbon dioxide, is crucial to prevent catastrophic outcomes such as extreme weather events and rising sea levels.
Energy Security: Wind and solar power, as renewable energy sources, provide a diverse and decentralized energy supply. This reduces dependence on finite and geopolitically sensitive fossil fuel reserves, enhancing energy security and resilience.
Economic Opportunities: The renewable energy sector fosters job creation and economic growth. Investments in clean energy technologies stimulate innovation, create employment opportunities, and contribute to developing a robust and sustainable economy.
Public Health Improvement: Transitioning away from fossil fuels decreases the release of harmful pollutants, leading to improved air and water quality. This, in turn, positively impacts public health by reducing respiratory illnesses and other pollution-related diseases.
Resource Conservation: Unlike finite fossil fuel reserves, renewable sources are inherently sustainable and inexhaustible. By harnessing the power of sunlight, wind, water, and geothermal heat, societies can meet their energy needs without depleting limited natural resources.
Technological Advancements: The transition to renewables drives innovation and technological advancements. Research and development in clean energy technologies contribute to a cleaner environment and the advancement of scientific knowledge and industrial capabilities.
Global Cooperation: The shift to renewable energy encourages international collaboration to address shared challenges. Collaborative efforts in research, development, and the adoption of clean energy technologies can foster diplomatic ties and strengthen global cooperation.

Types of Renewable Energy

Sources naturally replenished on a human timescale, making them sustainable and environmentally friendly, derive renewable energy. Listed below are the main types of renewable energy:

Solar Power: While solar thermal systems use sunshine to heat a fluid that produces steam to power turbines, photovoltaic cells use sunlight to convert light into energy.
Wind Energy: Wind turbines are machines that use the wind’s kinetic energy to generate electricity through wind energy. When the wind rotates the turbine blades, a generator transforms that rotational energy into electrical energy. Onshore or offshore locations often host wind farms.
Hydropower: Hydropower produces electricity by harnessing the energy of flowing water. Run-of-river systems divert a portion of a river’s flow, while dam-based hydropower involves the controlled release of stored water through turbines to generate power.
Biomass Energy: Organic materials like wood, agricultural waste, and agricultural residues produce biomass energy. Biomass can produce heat, electricity, and biofuels through combustion or anaerobic digestion, offering a versatile energy source.
Geothermal Energy: Geothermal energy taps into the Earth’s internal heat by harnessing steam or hot water beneath the Earth’s surface. Geothermal power plants convert this thermal energy into electricity, providing a consistent and reliable power source.
Tidal Energy: Tidal energy harnesses the moon’s and sun’s gravitational pull to create electricity as the tides rise and fall. Utilizing underwater turbines allows tidal stream devices to capture the energy of the water’s flow.
Wave Energy: Wave energy captures the motion of ocean waves to generate electricity. Wave energy converters, including point absorbers and oscillating water columns, convert waves’ up and down motion into usable power.
Hydrogen Energy: Hydrogen, often considered a carrier of energy, can be produced through electrolysis using renewable electricity. It is a clean fuel for various applications, including transportation and industrial processes, emitting only water vapor when used.

Technological advancements

Technological breakthroughs have shaped the modern world, revolutionizing industries and elevating people’s standard of living. Several key areas highlight the profound impact of technology on society:

Information Technology (IT): The evolution of IT has transformed communication, information access, and business operations. The development of the Internet, cloud computing , and mobile technologies has facilitated instantaneous global communication, d ata storage , and access to vast amounts of information.
Artificial Intelligence & Machine Learning: AI and ML have ushered in a new era of automation and decision-making capabilities. From autonomous vehicles to predictive analytics in healthcare, these technologies continue to enhance efficiency, accuracy, and problem-solving across various industries.
Biotechnology: Advances in biotechnology have revolutionized healthcare, agriculture, and environmental conservation. Gene editing tools like CRISPR-Cas9 offer unprecedented possibilities in treating genetic disorders, while biotech applications in agriculture improve crop yield and resilience.
Renewable Energy Technologies: Clean energy generation is now more economical and efficient thanks to renewable energy technology, including energy storage systems, wind turbines, and solar panels. These innovations are pivotal in addressing environmental challenges and promoting sustainable practices.
Nanotechnology: Nanotechnology manipulates materials at the atomic or molecular level. Nanotechnology has transformed the fields of materials science, electronics, and medicine. As a result, scientists have created sophisticated materials with unique qualities, developed more compact and potent electrical devices, and improved medication delivery methods.
3D Printing: Layer-by-layer construction of three-dimensional items is possible with additive manufacturing, also known as 3D printing. This technology utilizes diverse applications, from prototyping and manufacturing to healthcare, producing custom implants and prosthetics.
Blockchain Technology: The decentralized and secure ledger technology known as blockchain powers cryptocurrencies such as Bitcoin . Beyond finance, it finds applications in supply chain management , voting systems, and ensuring the integrity and transparency of various processes.
Quantum Computing: Using the ideas of quantum mechanics, quantum computing can execute intricate calculations at a pace impossible for conventional computers. This can potentially revolutionize fields such as cryptography, optimization problems, and drug discovery.
Internet of Things (IoT): The technology known as the Internet of Things (IoT) enables commonplace objects to be linked to the Internet and gather and share data. This interconnectedness enhances efficiency in smart homes, cities, and industries, optimizing resource utilization and overall productivity.
Augmented and Virtual Reality (AR/VR): AR and VR technologies immerse users in virtual or augmented environments, transforming experiences in fields like gaming, education, healthcare, and training simulations.

Challenges and Solutions

Addressing the challenges posed by technological advancements, societal changes, and global issues requires proactive strategies and innovative solutions. Here are some main challenges and possible solutions:

Cybersecurity Threats:
Challenge: Due to the growing interconnectivity of systems and the dependence on digital technology, individuals and organizations are more vulnerable to cyber threats such as ransomware attacks and data breaches.
Solution: Implementing robust cybersecurity measures, regular updates, and user education can help mitigate cyber risks. Collaboration between governments, industries, and cybersecurity experts is crucial for developing effective strategies.
Privacy Concerns:
Challenge: The collection and utilization of personal data by companies and governments raise concerns about privacy infringement.
Solution: Implemented to safeguard people’s privacy rights, GDPR (the General Data Protection Regulation) and other stricter laws and policies exist. Innovations like privacy-enhancing technologies and decentralized identity solutions offer alternative approaches.
Job Displacement Due to Automation:
Challenge: Automation and artificial intelligence technologies can lead to job displacement and economic inequality.
Solution: Reskilling and upskilling programs and focusing on education in emerging fields can prepare the workforce for the changing job landscape. Social policies like universal basic income (UBI) may provide a safety net during transitions.
Environmental Degradation:
Challenge: Industrial activities and resource exploitation contribute to environmental degradation, climate change, and biodiversity loss.
Solution: Sustainable practices, renewable energy adoption, and circular economy principles can mitigate environmental impact. International cooperation and stringent environmental regulations also play a crucial role.
Ethical Concerns in AI:
Challenge: Ethical issues surrounding artificial intelligence include biased algorithms, lack of transparency, and potential misuse.
Solution: Implementing ethical guidelines and standards for AI development, promoting transparency in algorithms, and fostering interdisciplinary collaboration on AI ethics can help address these concerns.
Healthcare Access Disparities:
Challenge: Access to quality healthcare is unique globally, with disparities exacerbated by factors such as geography and socioeconomic status.
Solution: Telemedicine, mobile health applications, and innovative healthcare delivery models can improve access. International collaborations and investment in healthcare infrastructure can reduce disparities.
Digital Inequality:
Challenge: Not everyone has equal access to digital technologies, leading to disparities in education, economic opportunities, and social inclusion.
Solution: Initiatives focusing on digital literacy, affordable internet access, and technology inclusion programs can bridge the digital divide. Governments and organizations can also invest in infrastructure to expand connectivity.
Global Public Health Crises:
Challenge: Events like pandemics can strain healthcare systems, disrupt economies, and create social upheaval.
Solution: Preparedness plans, early warning systems, and international cooperation in research and resource allocation are crucial. Advances in biotechnology and data analytics can aid in swift responses.
Ethical Use of Biotechnology:
Challenge: Biotechnological advancements like gene editing raise ethical concerns about human enhancement and unintended consequences.
Solution: Robust ethical frameworks, public engagement, and interdisciplinary dialogues involving ethicists, scientists, and policymakers can guide responsible biotechnological development.
Energy Transition Challenges:
Challenge: Shifting from traditional to renewable energy sources faces infrastructure, economic viability, and societal acceptance challenges.
Solution: Government incentives, public awareness campaigns, and investment in research and development can accelerate the transition. Community involvement and stakeholder engagement are critical for successful adoption.

Global Initiatives and Policies

Global initiatives and policies play a pivotal role in shaping the trajectory of technological, economic, and environmental progress. These initiatives often reflect the collective effort of nations to address shared challenges and promote cooperation in various domains. Here are some notable global initiatives and policies:

Paris Agreement: Global leaders reached a global agreement to keep the rise in temperature to less than 2°C above pre-industrial levels. Nations aim to enhance climate resilience while reducing greenhouse gas emissions.
United Nations Sustainable Development Goals (SDGs): The 17 goals address global issues, including poverty, inequality, and environmental sustainability. Goal 7 targets explicitly affordable and clean energy, promoting the transition to renewable sources.
IRENA(International Renewable Energy Agency): An intergovernmental organization promoting the widespread use of renewable energy. IRENA facilitates cooperation among nations, provides policy advice, and supports capacity building for renewable energy projects.
Clean Energy Ministerial (CEM): A forum bringing together energy ministers from various nations to promote clean energy policies, share best practices, and collaborate on initiatives to advance the global transition to low-carbon technologies.
Mission Innovation: A global initiative involving 24 countries and the European Union, committed to doubling public investment in clean energy research and development over five years. It aims to accelerate innovation and make clean energy more affordable.
European Green Deal: An ambitious EU policy framework aiming for climate neutrality by 2050. It describes plans to lower greenhouse gas emissions, support renewable energy, and completely revamp the European economy.
Renewable Energy Policies at National Levels: Many countries have established specific policies and targets to promote renewable energy adoption. Examples include Germany’s Energiewende, India’s National Solar Mission, and China’s commitment to peak carbon emissions by 2030.
Power Africa: An initiative by the U.S. government to increase access to electricity in sub-Saharan Africa. Its main objectives are to encourage investment in the region’s power sector and to facilitate the development of renewable energy projects.
Global Geothermal Alliance: Launched at COP21, the alliance promotes geothermal energy deployment worldwide. It encourages collaboration between governments, development partners, and the private sector to harness the potential of geothermal resources.
ESMAP (World Bank’s Energy Sector Management Assistance Program): ESMAP supports developing countries in building sustainable energy systems. It provides technical assistance, policy advice, and financial support for projects promoting renewable energy and energy efficiency.

Case Studies

Germany’s Energiewende: Germany’s ambitious energy transition, known as Energiewende, aims to shift from conventional energy sources to renewable energy. The country has made significant investments in wind and solar energy, enacted energy-saving measures, and plans to phase out nuclear power. The Energiewende case study exemplifies the integration of renewables into the energy mix and the challenges of maintaining grid balance during this transition.
China’s Renewable Energy Expansion: China has become a global leader in renewable energy deployment. The country has significantly invested in wind and solar energy projects, increasing capacity. The case study explores China’s policy incentives, market dynamics, and technological advancements that have facilitated its rapid expansion in the renewable energy sector.
Denmark’s Wind Power Success: Denmark has been a pioneer in wind energy, with wind power contributing significantly to its electricity generation. The case study delves into Denmark’s wind energy policies, including favorable regulatory frameworks, community engagement, and advancements in wind turbine technology. It highlights the economic and environmental benefits of widespread wind power adoption.
California’s Renewable Energy Leadership: In the US, California has used renewable energy. The state’s case study examines its aggressive renewable portfolio standards, innovative policies promoting solar power, and the role of technology companies in driving clean energy initiatives. California’s experience demonstrates the potential for subnational entities to lead in renewable energy transitions.
Rural Electrification in India through Solar Power: India’s case study focuses on rural electrification efforts using solar power. Initiatives like the National Solar Mission and off-grid solar projects have brought electricity to remote areas, transforming lives and fostering economic development. The study explores the challenges faced and lessons learned in scaling up solar energy access in a diverse and populous country.
Costa Rica’s Renewable Energy Achievement: Costa Rica stands out for achieving high levels of renewable energy generation, primarily from hydropower, wind, and geothermal sources. The case study examines the country’s commitment to environmental sustainability, policies promoting clean energy, and the role of hydropower in maintaining a reliable and renewable energy supply.
South Australia’s Grid Transformation: South Australia’s case study illustrates its transition to a renewable energy-dominant grid. The state has faced challenges related to grid stability and intermittency but has also demonstrated successful integration of wind and solar power. The study delves into the policy measures, technological solutions, and lessons learned in South Australia’s journey toward a low-carbon energy system.
Morocco’s Concentrated Solar Power Project: Morocco’s case study focuses on the Noor Ouarzazate Solar Complex, one of the world’s most significant concentrated solar power projects. The initiative aims to harness solar energy for electricity generation, reduce dependence on fossil fuels, and contribute to national energy security. The study explores the project’s technological innovations, financing models, and the impact on Morocco’s energy landscape.

Future Prospects

The future of energy holds exciting possibilities as technological advancements and evolving societal priorities shape the landscape. Several key prospects are likely to influence the trajectory of the global energy sector:

Emerging Technologies: Ongoing research and development in renewable energy technologies will likely yield breakthroughs in efficiency, cost-effectiveness, and energy storage. Innovations such as advanced solar cells, next-generation wind turbines, and novel energy storage solutions will be crucial in shaping the future energy landscape.
Tidal and Wave Energy: Tidal and wave energy, largely untapped at present, hold significant potential for sustainable power generation. As technologies mature, harnessing the kinetic energy of ocean tides and waves could contribute to a more diverse and reliable renewable energy mix.
Advanced Solar Technologies: Continued advancements in solar technologies, including thin-film solar cells, tandem solar cells, and solar paint, are anticipated. These innovations aim to enhance the efficiency of solar energy capture and broaden its applications across various industries.
Integration into Various Sectors: One of the most important aspects of the energy landscape of the future is integrating renewable energy into various sectors, including industrial processes and transportation. Electric vehicles, green hydrogen production, and sustainable manufacturing will likely gain prominence.
Energy Transition in Developing Countries: A significant role in the global energy transition is expected to be played by developing countries. International collaborations, financial support, and technology transfer will empower these nations to leapfrog traditional fossil fuel-dependent phases of development and embrace cleaner energy solutions.
Smart Grids and Energy Storage: Deploying smart power grids, in conjunction with advanced energy storage solutions, will simplify the integration of renewable energy resources in existing power systems. Battery technologies, grid-scale storage, and demand-response mechanisms will enhance grid reliability and flexibility.
Decentralized Energy Systems: Decentralized energy systems, such as community microgrids and distributed energy resources, will likely become more prevalent. These systems empower communities to generate, store, and manage their energy locally, promoting resilience and energy independence.
Circular Economy in Energy: The adoption of circular economy principles in the energy sector will gain traction, emphasizing resource efficiency, recycling, and waste reduction. This strategy seeks to mitigate the harmful consequences of energy production and consumption on nature.
Policy and Regulatory Shifts: Governments worldwide are expected to implement more ambitious policies and regulations to accelerate the transition to renewable energy. Carbon pricing, renewable energy mandates, and incentives for sustainable practices will shape the regulatory environment.
Global Collaboration: International cooperation and collaboration will be crucial for addressing global energy challenges. Shared research initiatives, technology transfer, and joint efforts to combat climate change will foster a collective approach to building a sustainable energy future.

The global shift towards renewable energy is pivotal in fostering a sustainable future. The imperative to mitigate climate change, ensure energy security, and promote economic prosperity underscores the significance of embracing clean technologies. The trajectory towards a low-carbon energy landscape becomes increasingly tangible as nations unite in initiatives like the Paris Agreement and implement robust policies. The successes of case studies from Germany to China demonstrate the feasibility and benefits of renewable energy adoption. By continuing to innovate, invest, and collaborate, humanity can unlock the full potential of renewable sources, ensuring a resilient and environmentally responsible energy paradigm for generations to come.

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Renewable energy articles from across Nature Portfolio

Renewable energy is energy that comes from sources that are readily replenishable on short-timescales. Examples of these are solar radiation, wind, and biomass.

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Executive summary

Global forecast summary
Net Zero Emissions by 2050 Scenario tracking
Transport biofuels
Net Zero Emissions by 2050 scenario tracking
Special section: Biogas and biomethane

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IEA (2024), Renewables 2023 , IEA, Paris https://www.iea.org/reports/renewables-2023, Licence: CC BY 4.0

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2023 saw a step change in renewable capacity additions, driven by china’s solar pv market.

Global annual renewable capacity additions increased by almost 50% to nearly 510 gigawatts (GW) in 2023, the fastest growth rate in the past two decades. This is the 22nd year in a row that renewable capacity additions set a new record. While the increases in renewable capacity in Europe, the United States and Brazil hit all-time highs, China’s acceleration was extraordinary. In 2023, China commissioned as much solar PV as the entire world did in 2022, while its wind additions also grew by 66% year-on-year. Globally, solar PV alone accounted for three-quarters of renewable capacity additions worldwide.

Achieving the COP28 target of tripling global renewable capacity by 2030 hinges on policy implementation

Prior to the COP28 climate change conference in Dubai, the International Energy Agency (IEA) urged governments to support five pillars for action by 2030, among them the goal of tripling global renewable power capacity. Several of the IEA priorities were reflected in the Global Stocktake text agreed by the 198 governments at COP28, including the goals of tripling renewables and doubling the annual rate of energy efficiency improvements every year to 2030. Tripling global renewable capacity in the power sector from 2022 levels by 2030 would take it above 11 000 GW, in line with IEA’s Net Zero Emissions by 2050 (NZE) Scenario.

Under existing policies and market conditions, global renewable capacity is forecast to reach 7 300 GW by 2028. This growth trajectory would see global capacity increase to 2.5 times its current level by 2030, falling short of the tripling goal. Governments can close the gap to reach over 11 000 GW by 2030 by overcoming current challenges and implementing existing policies more quickly. These challenges fall into four main categories and differ by country: 1) policy uncertainties and delayed policy responses to the new macroeconomic environment; 2) insufficient investment in grid infrastructure preventing faster expansion of renewables; 3) cumbersome administrative barriers and permitting procedures and social acceptance issues; 4) insufficient financing in emerging and developing economies. This report’s accelerated case shows that addressing those challenges can lead to almost 21% higher growth of renewables, pushing the world towards being on track to meet the global tripling pledge.

Cumulative renewable electricity capacity in the main and accelerated cases and Net Zero Scenario

What is needed to reach the collective target to triple renewables by 2030 varies significantly by country and region. G20 countries account for almost 90% of global renewable power capacity today. In the accelerated case, which assumes enhanced implementation of existing policies and targets, the G20 could triple their collective installed capacity by 2030. As such, they have the potential to contribute significantly to tripling renewables globally. However, to achieve the global goal, the rate of new installations needs to accelerate in other countries, too, including many emerging and developing economies outside the G20, some of which do not have renewable targets and/or supportive policies today.

The global power mix will be transformed by 2028

The world is on course to add more renewable capacity in the next five years than has been installed since the first commercial renewable energy power plant was built more than 100 years ago. In the main case forecast in this report, almost 3 700 GW of new renewable capacity comes online over the 2023‑2028 period, driven by supportive policies in more than 130 countries. Solar PV and wind will account for 95% of global renewable expansion, benefiting from lower generation costs than both fossil and non‑fossil fuel alternatives.

Over the coming five years, several renewable energy milestones are expected to be achieved:

In 2024, wind and solar PV together generate more electricity than hydropower.
In 2025, renewables surpass coal to become the largest source of electricity generation.
Wind and solar PV each surpass nuclear electricity generation in 2025 and 2026 respectively.
In 2028, renewable energy sources account for over 42% of global electricity generation, with the share of wind and solar PV doubling to 25%.

Share of renewable electricity generation by technology, 2000-2028

China is the world’s renewables powerhouse.

China accounts for almost 60% of new renewable capacity expected to become operational globally by 2028. Despite the phasing out of national subsidies in 2020 and 2021, deployment of onshore wind and solar PV in China is accelerating, driven by the technologies’ economic attractiveness as well as supportive policy environments providing long-term contracts. Our forecast shows that China is expected to reach its national 2030 target for wind and solar PV installations this year, six years ahead of schedule. China’s role is critical in reaching the global goal of tripling renewables because the country is expected to install more than half of the new capacity required globally by 2030. At the end of the forecast period, almost half of China’s electricity generation will come from renewable energy sources.

Renewable electricity capacity growth in China, main case, 2005-2028

Renewable electricity capacity growth by country or region, main case, 2005-2028, the us, the eu, india and brazil remain bright spots for onshore wind and solar pv growth.

Solar PV and onshore wind additions through 2028 is expected to more than double in the United States, the European Union, India and Brazil compared with the last five years. Supportive policy environments and the improving economic attractiveness of solar PV and onshore wind are the primary drivers behind this acceleration. In the European Union and Brazil, growth in rooftop solar PV is expected to outpace large-scale plants as residential and commercial consumers seek to reduce their electricity bills amid higher prices. In the United States, the Inflation Reduction Act has acted as a catalyst for accelerated additions despite supply chain issues and trade concerns in the near term. In India, an expedited auction schedule for utility-scale onshore wind and solar PV along with improved financial health of distribution companies is expected to deliver accelerated growth.

Renewable energy expansion also starts accelerating in other regions of the world, notably the Middle East and North Africa, owing mostly to policy incentives that take advantage of the cost-competitiveness of solar PV and onshore wind power. Although renewable capacity growth picks up in sub‑Saharan Africa, the region still underperforms considering its resource potential and electrification needs.

Solar PV prices plummet amid growing supply glut

In 2023, spot prices for solar PV modules declined by almost 50% year-on-year, with manufacturing capacity reaching three times 2021 levels. The current manufacturing capacity under construction indicates that the global supply of solar PV will reach 1 100 GW at the end of 2024, with potential output expected to be three times the current forecast for demand. Despite unprecedented PV manufacturing expansion in the United States and India driven by policy support, China is expected to maintain its 80‑95% share of global supply chains (depending on the manufacturing segment). Although developing domestic PV manufacturing will increase the security of supply and bring economic benefits to local communities, replacing imports with more expensive production in the United States, India and the European Union will increase the cost of overall PV deployment in these markets.

Onshore wind and solar PV are cheaper than both new and existing fossil fuel plants

In 2023, an estimated 96% of newly installed, utility-scale solar PV and onshore wind capacity had lower generation costs than new coal and natural gas plants. In addition, three-quarters of new wind and solar PV plants offered cheaper power than existing fossil fuel facilities. Wind and solar PV systems will become more cost-competitive during the forecast period. Despite the increasing contribution needs for flexibility and reliability to integrate variable renewables, the overall competitiveness of onshore wind and solar PV changes only slightly by 2028 in Europe, China, India and the United States.

The new macroeconomic environment presents further challenges that policy makers need to address

In 2023, new renewable energy capacity financed in advanced economies was exposed to higher base interest rates than in China and the global average for the first time. Since 2022, central bank base interest rates have increased from below 1% to almost 5%. In emerging and developing economies, renewables developers have been exposed to higher interest rates since 2021, resulting in higher costs hampering faster expansion of renewables.

The implications of this new macroeconomic environment are manifold for both governments and industry. First, inflation has increased equipment costs for onshore and offshore wind and partly for solar PV (excluding module costs). Second, higher interest rates are increasing the financing costs of capital-intensive variable renewable technologies. Third, policy has been relatively slow to adjust to the new macroeconomic environment due in part to expectations that cost reductions would continue together with permitting challenges. This has left several auctions in advanced economies undersubscribed, particularly in Europe. Additionally, some developers whose power purchase contracts were signed prior to these macroeconomic changes have had to cancel their projects. Efforts to improve auction design and contract indexation methodologies are needed to resolve these challenges and unlock additional wind and solar PV deployment.

The renewable energy industry, particularly wind, is grappling with macroeconomic challenges affecting its financial health – despite a history of financial resilience. The wind industry has experienced a significant decline in market value as European and North American wind turbine manufacturers have seen negative net margins for seven consecutive quarters due to volatile demand, limited raw material access, economic challenges, and rising interest rates. To address these issues, the European Union launched a Wind Power Action Plan in October 2023, aiming to enhance competitiveness, improve auction design, boost clean technology investment, streamline permitting, and ensure fair competition. Chinese wind turbine manufacturers, benefiting from strong domestic demand and vertical integration, remain relatively stable amid global challenges.

Weighted average net margins of renewable energy companies, large utilities and oil majors, Q1-Q4 2022 and Q1-Q3 2023

The forecast for wind capacity additions is less optimistic outside china, especially for offshore.

The wind industry, especially in Europe and North America is facing challenges due to a combination of ongoing supply chain disruptions, higher costs and long permitting timelines. As a result of these challenges, the forecast for onshore wind outside of China has been revised downwards as overall project development has been slower than expected.

Offshore wind has been hit hardest by the new macroeconomic environment, with its expansion through 2028 revised down by 15% outside China. The challenges facing the industry particularly affect offshore wind, with investment costs today more than 20% higher than only a few years ago. In 2023, developers have cancelled or postponed 15 GW of offshore wind projects in the United States and the United Kingdom. For some developers, pricing for previously awarded capacity does not reflect the increased costs facing project development today, which reduces project bankability.

Faster deployment of variable renewables increases integration and infrastructure challenges

The share of solar PV and wind in global electricity generation is forecast to double to 25% in 2028 in our main case. This rapid expansion in the next five years will have implications for power systems worldwide. In the European Union, annual variable renewables penetration in 2028 is expected to reach more than 50% in seven countries, with Denmark having around 90% of wind and solar PV in its electricity system by that time. Although European Union interconnections help integrate solar PV and wind generation, grid bottlenecks will pose significant challenges and lead to increased curtailment in many countries as grid expansion cannot keep pace with accelerated installation of variable renewables.

Current hydrogen plans and implementation don’t match

Renewable power capacity dedicated to hydrogen-based fuel production is forecast to grow by 45 GW between 2023 and 2028, representing only an estimated 7% of announced project capacity for the period. China, Saudi Arabia and the United States account for more than 75% of renewable capacity for hydrogen production by 2028. Despite announcements of new projects and pipelines, the progress in planned projects has been slow. We have revised down our forecasts for all regions except China. The main reason is the slow pace of bringing planned projects to final investment decisions due to a lack of off‑takers and the impact of higher prices on production costs. The development of an international hydrogen market is a key uncertainty affecting the forecast, particularly for markets that have limited domestic demand for hydrogen.

Biofuel deployment is accelerating and diversifying more into renewable diesel and biojet fuel

Emerging economies, led by Brazil, dominate global biofuel expansion, which is set to grow 30% faster than over the last five years. Supported by robust biofuel policies, increasing transport fuel demand and abundant feedstock potential, emerging economies are forecast to drive 70% of global biofuel demand growth over the forecast period. Brazil alone accounts for 40% of biofuel expansion to 2028. Stronger policies are the primary driver of this growth as governments expand efforts to provide affordable, secure and low-emission energy supplies. Biofuels used in the road transport sector remain the primary source of new supply, accounting for nearly 90% of the expansion.

Five-year biofuel demand growth for advanced and emerging economies, main case, 2011-2028

Electric vehicles (EVs) and biofuels are proving to be a powerful complementary combination for reducing oil demand . Globally, biofuels and renewable electricity used in EVs are forecast to offset 4 million barrels of oil‑equivalent per day by 2028, which is more than 7% of forecast oil demand for transport. Biofuels remain the dominant pathway for avoiding oil demand in the diesel and jet fuel segments. EVs outpace biofuels in the gasoline segment, especially in the United States, Europe and China.

Aligning biofuels with a net zero pathway requires a huge increase in the pace of deployment

This report’s main case forecast is not in line with the near tripling of biofuels demand by 2030 seen in the IEA’s Net Zero Emissions by 2050 (NZE) Scenario. In the aviation sector for instance, the Net Zero Scenario would require 8% of fuel supply coming from biojet fuel by 2030, while existing policies in this forecast will only bring biojet fuel’s share to 1% by 2028. Bridging this gap requires new and stronger policies, as well as diversification of feedstocks.

Much faster biofuel deployment is possible through new policies and addressing supply chain challenges. In this report’s accelerated case, biofuel supply growth is nearly triple that of the main case, closing the gap with the Net Zero Scenario by nearly 40%. Nearly half of this additional growth, almost 30 billion litres, is driven by strengthened policies in existing markets such as the United States, Europe and India. Another 20 billion litres comes mainly from biodiesel in India and ethanol in Indonesia. Biojet fuel offers a third growth avenue, expanding to cover nearly 3.5% of global aviation fuels, up from 1% in the main case. Fuels made from waste and residues also grow four times faster in the accelerated case.

Renewable heat accelerates amid high energy prices and policy momentum – but not enough to curb emissions

Modern renewable heat consumption expands by 40% globally during the outlook period, rising from 13% to 17% of total heat consumption. These developments come predominantly from the growing reliance on electricity for process heat – notably with the adoption of heat pumps in non‑energy‑intensive industries – and the deployment of electric heat pumps and boilers in buildings, increasingly powered by renewable electricity. China, the European Union and the United States lead these trends, owing to supportive policy environments; updated targets in the European Union and China; strong financial incentives in many markets; the adoption of renewable heat obligations; and fossil fuel bans in the buildings sector.

However, the trends to 2028 are still largely insufficient to tackle the use of fossil fuels for heat and put the world on track to meet Paris Agreement goals. Without stronger policy action, the global heat sector alone between 2023 and 2028 could consume more than one‑fifth of the remaining carbon budget for a pathway aligned with limiting global warming to 1.5°C. Global renewable heat consumption would have to rise 2.2 times as quickly and be combined with wide-scale demand-side measures and much larger energy and material efficiency improvements to align with the NZE Scenario.

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Renewable Energy Essay: Tips to Write a Great Paper

Scientists have categorized climate change as the greatest threat facing humanity today. While there’s irrefutable evidence that our climate is warming up, scientists are divided on its probable causes, with some attributing it to anthropogenic origins and others claiming Earth’s orbital patterns, among myriads of hypotheses. Today, climatologists and other mainstream researchers float renewable energy as humanity’s silver bullet to fight climate change. The discussions around the topic have inspired interest among the young and the old, leading to increased enrolment in climate-related studies, participation in demos and campaigns, and sharing of knowledge in talk shows and online platforms. However, being passionate about renewable energy and sharing your insights with others are two different things. Many people struggle to express themselves. Yet, there’s no room for hesitation regarding climate change. We must all act now and play the small part we can to reverse it. As such, it’s crucial to understand the power of words in advocating for change as the world shifts towards more sustainable energy sources. In this short article, we’ll guide you in crafting a winning essay on renewable energy, exploiting the power of storytelling to capture people’s attention while highlighting the importance of taking immediate action to reverse its potential impacts on humanity.

Unlocking the Power of Words: Secrets to Writing about Energy

The internet is awash with essays and articles on various topics. In the last few years, climate change has become one of the most targeted topics of discussion. So, by writing another renewable energy essay, you could add to the debate but not make any significant impact. Therefore, it’s vital to create a well-crafted piece to convey your ideas and influence your audience effectively. Remember that the intention is not to add to the existing literature but to make a powerful impact. A poorly written essay may fail to engage your readers and diminish the significance of your message. Consider what’s at stake when writing a renewable energy essay.

To make your work stand out, pay special attention to writing mechanics such as coherence and persuasive techniques. Additionally, adhere to grammar and writing style requirements. Most importantly, stay on the topic. While climate change is an emotive issue, be careful not to be dragged into every aspect of the debate. Yours should be to communicate your ideas effectively and inspire action.

From Sun to Success: Tips to Write an Essay on Renewable Energy

Writing a renewable energy paper is unlike crafting other documents. The scrutiny such pieces get in today’s world is mind-boggling. A simple misrepresentation of facts or omission can attract incredibly unwanted attention. So, how do you create an impactful and persuasive piece of writing on this topic? We’ve got you covered. Below, we’ve put together some invaluable tips to help you harness the power of words to make a difference in the world of renewable energy.

Choosing the perfect topic

There are numerous topics under renewable energy to explore. It’s improbable to examine or discuss them all. Consequently, it would be best to settle for the one that interests you the most or addresses the most critical issues on the subject matter. Here are a few factors to consider when choosing a topic:

Relevance: If it’s not germane, don’t write it. Your primary objective is to address current issues and developments in the field of renewable energy, ensuring your essay is timely and highlights essential concerns. We understand this can challenge some students, so we recommend seeking professional help. For example, you can use a trustworthy paper writing service , to help write your essay online or develop a topic.

Uniqueness: As we said earlier, you don’t want to add to existing literature but explore new ideas from different perspectives. Consider topics that stand out, especially those in niche areas or emerging technologies within renewable energy, e.g., wave and tidal power, solar skin technology, and floating solar farms, among others.

Passion : Don’t just write, do so about the things you love or are genuinely passionate about. Readers can always tell if you’re writing for money, attention, or interest. If you put your heart into it, your enthusiasm will shine through it and engage them.

Conduct thorough research

Thorough research is the backbone of any well-written essay. This is especially critical when crafting an essay on renewable energy. You must not only gather reliable and up-to-date information from credible sources but also use them expertly. But how can an amateur achieve this? Here are some tips:

Rely on credible sources: Libraries and online databases contain millions of books and articles about renewable energy. So, how can a student know reputable ones? Most often, academic journals and government reports are the most reliable. They contain information that’s been verified by peers. You can also check educational institutes and organizations that provide primary data, e.g., NASA and NSE.

Stay updated : Things can move very fast in the field of renewable energy. As such, you must always be alert or risk being left behind. Therefore, access the latest research on the topic and, if possible, subscribe to newsletters and publications on renewable energy. A rapidly evolving field requires unconventional ways to stay ahead.

Take notes : There could be so much to learn on this topic. However, always note new trends, emerging issues, and controversies. This way, you can update your essays long after writing them, keeping them relevant for longer.

Structuring your essay for maximum impact

An essay is only as impactful as the structure of its arguments. You can’t go far with a haphazard essay design. You must adopt a well-structured format to convey your ideas clearly and effectively. This may not be as straightforward as it seems. So, here are a few considerations for you:

Introduction : Begin your article with a powerful and captivating paragraph outlining what it is about and the direction of your argument. Remember that a flat introduction can distract readers from an otherwise excellent essay.

Main body : Divide the body of your essay into several paragraphs, each focusing on a specific aspect or argument related to renewable energy. Here, you’re supposed to produce evidence and dispute any divergent opinions with solid arguments. This is the core of your paper.

Conclusion : This section is no less important than the others. You should use it to summarize your main points and restate your thesis statement. Given the criticalness of the topic, you can sign off with a thought-provoking message that reinforces the importance of renewable energy and encourages action or further exploration of the subject.

Do Some Research to Craft an A+ Renewable Energy Essay

Any good English paper requires careful planning, thorough research, and effective writing techniques . However, when trading in extremely high-stakes zones, your writing ability becomes secondary. The accuracy of your claims comes first when crafting essays on renewable energy. Still, other components remain vital. Therefore, by choosing a compelling topic, conducting thorough research based on valid questions, structuring your essay for maximum impact, and utilizing persuasive language and credible sources, you can create a powerful piece of writing that inspires action and raises awareness about the importance of renewable energy.

Renewable Energy and the Need for Renewable Energy

First Online: 19 July 2024

Cite this chapter

Neyre Tekbıyık Ersoy 2

Part of the book series: Synthesis Lectures on Renewable Energy Technologies ((SLRET))

Renewable energy means energy from renewable sources, such as; solar, wind, geothermal, tidal, wave and other ocean energy, hydropower, biomassand biogas, etc. These resources are called renewable as they are naturally replenished in a short period of time. Solar and geothermal energy can be used both for electricity production and for heating and cooling. Some other renewables, such as wind, tidal, wave and hydropower are usually used for producing mechanical motion or electricity. Biomass can be considered as the most diverse RE source, as it can be used in almost all the sectors; electricity, heating and cooling, and transportation (in form of biofuels). This chapter discusses various types of renewables, their benefits and the need for renewable energy production.

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European Parliament. (2024). Renewable energy: Setting ambitious targets for Europe . European Parliament. Retrieved April 2024, from https://www.europarl.europa.eu/topics/en/article/20171124STO88813/renewable-energy-setting-ambitious-targets-for-europe

EIA. (2023). Biomass explained . U.S. Energy Information Administration. Retrieved April 20224, from https://www.eia.gov/energyexplained/biomass/

Office of Energy Efficiency & Renewable Energy. (2024). Renewable energy . Office of Energy Efficiency & Renewable Energy. Retrieved April 2024, from https://www.energy.gov/eere/renewable-energy

United Nations. (2024). The facts on climate and energy . United Nations. Retrieved April 2024, from https://www.un.org/en/climatechange/science/mythbusters

National Geographic. (2024). Industrialization, labor, and life . National Geographic Headquarters. Retrieved April 2024, from https://education.nationalgeographic.org/resource/industrialization-labor-and-life/

Denchak, M. (2023). Greenhouse effect 101 . NRDC. Retrieved April 2024, from https://www.nrdc.org/stories/greenhouse-effect-101#solution

Clientearth Communications. (2022). Fossil fuels and climate change: The facts . Clientearth. Retrieved April 2024, from https://www.clientearth.org/latest/news/fossil-fuels-and-climate-change-the-facts/

IEA. (2024). Energy statistics data browser. International Energy Agency. Retrieved April 2024, from https://www.iea.org/data-and-statistics/data-tools/energy-statistics-data-browser?country=WORLD&fuel=Energy%20supply&indicator=TESbySource

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Tekbıyık Ersoy, N. (2025). Renewable Energy and the Need for Renewable Energy. In: Energy Efficiency and Renewable Energy Policies. Synthesis Lectures on Renewable Energy Technologies. Springer, Cham. https://doi.org/10.1007/978-3-031-64305-7_7

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What is renewable energy?

Renewable energy is energy derived from natural sources that are replenished at a higher rate than they are consumed. Sunlight and wind, for example, are such sources that are constantly being replenished. Renewable energy sources are plentiful and all around us.

Fossil fuels - coal, oil and gas - on the other hand, are non-renewable resources that take hundreds of millions of years to form. Fossil fuels, when burned to produce energy, cause harmful greenhouse gas emissions, such as carbon dioxide.

Generating renewable energy creates far lower emissions than burning fossil fuels. Transitioning from fossil fuels, which currently account for the lion’s share of emissions, to renewable energy is key to addressing the climate crisis.

Renewables are now cheaper in most countries, and generate three times more jobs than fossil fuels.

Here are a few common sources of renewable energy:

SOLAR ENERGY

Solar energy is the most abundant of all energy resources and can even be harnessed in cloudy weather. The rate at which solar energy is intercepted by the Earth is about 10,000 times greater than the rate at which humankind consumes energy.

Solar technologies can deliver heat, cooling, natural lighting, electricity, and fuels for a host of applications. Solar technologies convert sunlight into electrical energy either through photovoltaic panels or through mirrors that concentrate solar radiation.

Although not all countries are equally endowed with solar energy, a significant contribution to the energy mix from direct solar energy is possible for every country.

The cost of manufacturing solar panels has plummeted dramatically in the last decade, making them not only affordable but often the cheapest form of electricity. Solar panels have a lifespan of roughly 30 years , and come in variety of shades depending on the type of material used in manufacturing.

WIND ENERGY

Wind energy harnesses the kinetic energy of moving air by using large wind turbines located on land (onshore) or in sea- or freshwater (offshore). Wind energy has been used for millennia, but onshore and offshore wind energy technologies have evolved over the last few years to maximize the electricity produced - with taller turbines and larger rotor diameters.

Though average wind speeds vary considerably by location, the world’s technical potential for wind energy exceeds global electricity production, and ample potential exists in most regions of the world to enable significant wind energy deployment.

Many parts of the world have strong wind speeds, but the best locations for generating wind power are sometimes remote ones. Offshore wind power offers t remendous potential .

GEOTHERMAL ENERGY

Geothermal energy utilizes the accessible thermal energy from the Earth’s interior. Heat is extracted from geothermal reservoirs using wells or other means.

Reservoirs that are naturally sufficiently hot and permeable are called hydrothermal reservoirs, whereas reservoirs that are sufficiently hot but that are improved with hydraulic stimulation are called enhanced geothermal systems.

Once at the surface, fluids of various temperatures can be used to generate electricity. The technology for electricity generation from hydrothermal reservoirs is mature and reliable, and has been operating for more than 100 years .

Hydropower harnesses the energy of water moving from higher to lower elevations. It can be generated from reservoirs and rivers. Reservoir hydropower plants rely on stored water in a reservoir, while run-of-river hydropower plants harness energy from the available flow of the river.

Hydropower reservoirs often have multiple uses - providing drinking water, water for irrigation, flood and drought control, navigation services, as well as energy supply.

Hydropower currently is the largest source of renewable energy in the electricity sector. It relies on generally stable rainfall patterns, and can be negatively impacted by climate-induced droughts or changes to ecosystems which impact rainfall patterns.

The infrastructure needed to create hydropower can also impact on ecosystems in adverse ways. For this reason, many consider small-scale hydro a more environmentally-friendly option , and especially suitable for communities in remote locations.

OCEAN ENERGY

Ocean energy derives from technologies that use the kinetic and thermal energy of seawater - waves or currents for instance - to produce electricity or heat.

Ocean energy systems are still at an early stage of development, with a number of prototype wave and tidal current devices being explored. The theoretical potential for ocean energy easily exceeds present human energy requirements.

Bioenergy is produced from a variety of organic materials, called biomass, such as wood, charcoal, dung and other manures for heat and power production, and agricultural crops for liquid biofuels. Most biomass is used in rural areas for cooking, lighting and space heating, generally by poorer populations in developing countries.

Modern biomass systems include dedicated crops or trees, residues from agriculture and forestry, and various organic waste streams.

Energy created by burning biomass creates greenhouse gas emissions, but at lower levels than burning fossil fuels like coal, oil or gas. However, bioenergy should only be used in limited applications, given potential negative environmental impacts related to large-scale increases in forest and bioenergy plantations, and resulting deforestation and land-use change.

For more information on renewable sources of energy, please check out the following websites:

International Renewable Energy Agency | Renewables

International Energy Agency | Renewables

Intergovernmental Panel on Climate Change | Renewable Sources of Energy

UN Environment Programme | Roadmap to a Carbon-Free Future

Sustainable Energy for All | Renewable Energy

Renewable energy – powering a safer future

What is renewable energy and why does it matter? Learn more about why the shift to renewables is our only hope for a brighter and safer world.

Five ways to jump-start the renewable energy transition now

UN Secretary-General outlines five critical actions the world needs to prioritize now to speed up the global shift to renewable energy.

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The Understand Energy Learning Hub is a cross-campus effort of the Precourt Institute for Energy .

Introduction to Renewable Energy

Exploring our content.

Fast Facts View our summary of key facts and information. ( Printable PDF, 270 KB )

Before You Watch Our Lecture Maximize your learning experience by reviewing these carefully curated readings we assign to our students.

Our Lecture Watch the Stanford course lecture.

Additional Resources Find out where to explore beyond our site.

Orange sunset with wind turbines on the horizon

Fast Facts About Renewable Energy

Principle Energy Uses: Electricity, Heat Forms of Energy: Kinetic, Thermal, Radiant, Chemical

The term “renewable” encompasses a wide diversity of energy resources with varying economics, technologies, end uses, scales, environmental impacts, availability, and depletability. For example, fully “renewable” resources are not depleted by human use, whereas “semi-renewable” resources must be properly managed to ensure long-term availability. The most renewable type of energy is energy efficiency, which reduces overall consumption while providing the same energy service. Most renewable energy resources have significantly lower environmental and climate impacts than their fossil fuel counterparts.

The data in these Fast Facts do not reflect two important renewable energy resources: traditional biomass, which is widespread but difficult to measure; and energy efficiency, a critical strategy for reducing energy consumption while maintaining the same energy services and quality of life. See the Biomass and Energy Efficiency pages to learn more.

Significance

14% of world 🌎 9% of US 🇺🇸

Electricity Generation

30% of world 🌎 21% of US 🇺🇸

Global Renewable Energy Uses

Electricity 65% Heat 26% Transportation 9%

Global Consumption of Renewable Electricity Change

Increase: ⬆ 33% (2017 to 2022)

Energy Efficiency

Energy efficiency measures such as LED light bulbs reduce the need for energy in the first place

Renewable Resources

Wind Solar Ocean

Semi-Renewable Resources

Hydro Geothermal Biomass

Renewable Energy Has Vast Potential to Meet Global Energy Demand

Solar >1,000x global demand Wind ~3x global demand

Share of Global Energy Demand Met by Renewable Resources

Hydropower 7% Wind 3% Solar 2% Biomass <2%

Share of Global Electricity Generation Met by Renewable Resources

Hydropower 15% Wind 7% Solar 5% Biomass & Geothermal <3%

Global Growth

Hydropower generation increase ⬆6% Wind generation increase ⬆84% Solar generation increase ⬆197% Biofuels consumption increase ⬆23% (2017-2022)

Largest Renewable Energy Producers

China 34% 🇨🇳 US 10% 🇺🇸 of global renewable energy

Highest Penetration of Renewable Energy

Norway 72% 🇳🇴 of the country’s primary energy is renewable

(China is at 16%, the US is at 11%)

Largest Renewable Electricity Producers

China 31% 🇨🇳 US 11% 🇺🇸 of global renewable electricity

Highest Penetration of Renewable Electricity

Albania, Bhutan, CAR, Lesotho, Nepal, & Iceland 100%

Iceland, Ethiopia, Paraguay, DRC, Norway, Costa Rica, Uganda, Namibia, Eswatini, Zambia, Tajikistan, & Sierra Leone > 90% of the country’s primary electricity is renewable

(China is at 31%, the US is at 22%)

Share of US Energy Demand Met by Renewable Resources

Biomass 5% Wind 2% Hydro 1% Solar 1%

Share of US Electricity Generation Met by Renewable Resources

Wind 10% Hydropower 6% Solar 3% Biomass 1%

US States That Produce the Most Renewable Electricity

Texas 21% California 11% of US renewable energy production

US States With Highest Penetration of Renewable Electricity

Vermont >99% South Dakota 84% Washington 76% Idaho 75% of state’s total generation comes from renewable fuels

Renewable Energy Expansion Policies

The Inflation Reduction Act continued tax credits for new renewable energy projects in the US.

Production Tax Credit (PTC)

Tax credit of $0.0275/kWh of electricity produced at qualifying renewable power generation sites

Investment Tax Credit (ITC)

Tax credit of 30% of the cost of a new qualifying renewable power generation site

To read more about the credit qualifications, visit this EPA site .

LCOE of US Resources, 2023: Renewable Resources
Resource (Renewables)	Unsubsidized LCOE*	LCOE with ITC/PTC Tax Subsidy
Wind (Onshore)	$24 - $75	$0 - $66 (PTC)
Solar PV (Utility Scale)	$24 - $96	$16 - $80 (ITC) $0 - $77 (PTC)
Solar + Storage (Utility Scale)	$46 - $102	$31 - $88 (ITC)
Geothermal	$61 - $102	$37 - $87
Wind (Offshore)	$72 - $140	$56 - $114 (PTC)
Solar PV (Rooftop Residential)	$177 - $282	$74 - $229 (ITC)
Wind + Storage (Onshore)	$24 - $75	$0 - $66 (PTC)

LCOE of US Resources, 2023: Non-Renewable Resources.
(The ITC/PTC program does not provide subsidies for non-renewable resources. Fossil fuel and nuclear resources have significant subsidies from other policies.)
Resource (Non-Renewables)	Unsubsidized LCOE*
Natural Gas (combined cycle)	$39 - $101
Natural Gas Peaker Plants	$115 - $221
Coal	$68 - $166
Nuclear	$141 - $221

*LCOE (levelized cost of electricity) - price for which a unit of electricity must be sold for system to break even

Important Factors for Renewable Site Selection

Resource availability
Environmental constraints and sensitivities, including cultural and archeological sites
Transmission infrastructure
Power plant retirements
Transmission congestion and prices
Electricity markets
Load growth driven by population and industry
Policy support
Land rights and permitting
Competitive and declining costs of wind, solar, and energy storage
Lower environmental and climate impacts (social costs) than fossil fuels
Expansion of competitive wholesale electricity markets
Governmental clean energy and climate targets and policies
Corporate clean energy targets and procurement of renewable energy
No fuel cost or fuel price volatility
Retirements of old and/or expensive coal and nuclear power plants
Most renewable resources are abundant, undepletable
Permitting hurdles and NIMBY/BANANA* concerns
Competition from subsidized fossil fuels and a lack of price for their social cost (e.g., price on carbon)
Site-specific resources means greater need to transport energy/electricity to demand
High initial capital expenditure requirements required to access fuel cost/operating savings
Intermittent resources
Inconsistent governmental incentives and subsidies
Managing environmental impacts to the extent that they exist

*NIMBY - not in my backyard; BANANA - build absolutely nothing anywhere near anything

Climate Impact: Low to High

Solar, wind, geothermal, and ocean have low climate impacts with near-zero emissions; hydro and biomass can have medium to high climate impact
Hydro: Some locations have greenhouse gas emissions due to decomposing flooded vegetation
Biomass: Some crops require significant energy inputs, land use change can release carbon dioxide and methane

Environmental Impact: Low to High

Most renewable energy resources have low environmental impacts, particularly relative to fossil fuels; some, like biomass, can have more significant impacts
No air pollution with the exception of biomass from certain feedstocks
Can have land and habitat disruption for biomass production, solar, and hydro
Potential wildlife impacts from wind turbines (birds and bats)
Modest environmental impacts during manufacturing, transportation, and end of life

Updated January 2024

Before You Watch Our Lecture on Introduction to Renewable Energy

We assign videos and readings to our Stanford students as pre-work for each lecture to help contextualize the lecture content. We strongly encourage you to review the Essential reading below before watching our lecture on Introduction to Renewable Energy . Include the Optional and Useful readings based on your interests and available time.

The Sustainable Energy in America 2024 Factbook (Executive Summary pp. 5-10) . Bloomberg New Energy Finance. 2024. (6 pages) Provides valuable year-over-year data and insights on the American energy transformation.

Optional and Useful

Renewables 2024 Global Status Report (Global Overview pp. 10-39) . REN21. 2024. (30 pages) Documents the progress made in the renewable energy sector and highlights the opportunities afforded by a renewable-based economy and society.

Our Lecture on Introduction to Renewable Energy

This is our Stanford University Understand Energy course lecture that introduces renewable energy. We strongly encourage you to watch the full lecture to gain foundational knowledge about renewable energy and important context for learning more about specific renewable energy resources. For a complete learning experience, we also encourage you to review the Essential reading we assign to our students before watching the lecture.

Presented by: Kirsten Stasio , Adjunct Lecturer, Civil and Environmental Engineering, Stanford University; CEO, Nevada Clean Energy Fund (NCEF) Recorded on: May 15, 2024 Duration: 68 minutes

(Clicking on a timestamp will take you to YouTube.) 00:00 Introduction 02:06 What Does “Renewable” Mean? 15:29 What Role Do Renewables Play in Our Energy Use? 27:12 What Factors Affect Renewable Energy Project Development?

Lecture slides available upon request .

Additional Resources About Renewable Energy

Stanford university.

Precourt Institute for Energy Renewable Energy , Energy Efficiency
Stanford Energy Club
Energy Modeling Forum
Sustainable Stanford
Sustainable Finance Initiative
Mark Jacobson - Renewable energy
Michael Lepech - Life-cycle analysis
Leonard Ortolano - Environmental and water resource planning
Chris Field - Climate change, land use, bioenergy, solar energy
David Lobell - Climate change, agriculture, biofuels, land use
Sally Benson - Climate change, energy, carbon capture and storage

Government and International Organizations

International Energy Agency (IEA) Renewables Renewables 2022 Repor .
National Renewable Energy Laboratory (NREL)
US Department of Energy (DOE) Office of Energy Efficiency & Renewable Energy (EERE)
US Energy Information Administration (EIA) Renewable Energy Explained
US Energy Information Administration (EIA) Energy Kids Renewable Energy
US Energy Information Administration (EIA) Today in Energy Renewables

Other Organizations and Resources

REN21: Renewable Energy Policy Network for the 21st Century
REN21 Renewables 2023 Global Status Report Renewables in Energy Supply
BloombergNEF (BNEF)
Carnegie Institution for Science Biosphere Sciences and Engineering
The Solutions Project
Renewable Energy World
World of Renewables
Energy Upgrade California

Next Topic: Energy Efficiency Other Energy Topics to Explore

Fast Facts Sources

Energy Mix (World 2022): Energy Institute. Statistical Review of World Energy . 2023.
Energy Mix (US 2022): US Energy Information Agency (EIA). Total Energy: Energy Overview, Table 1.3 .
Electricity Mix (World 2022): Energy Institute. Statistical Review of World Energy . 2023.
Electricity Mix (US 2022): US Energy Information Agency (EIA). Total Energy: Electricity, Table 7.2a.
Global Solar Use (2022): REN21. Renewables 2023 Global Status Report: Renewables in Energy Supply , page 42. 2023
Global Consumption of Renewable Electricity Change (2017-2022): Energy Institute. Statistical Review of World Energy . 2023.
Renewable Energy Potential: Perez & Perez. A Fundamental Look at Energy Reserves for the Planet . 2009
Share of Global Energy Demand (2022): Energy Institute. Statistical Review of World Energy . 2023.
Share of Global Electricity Demand (2022): Energy Institute. Statistical Review of World Energy . 2023.
Global Growth (2017-2022): Energy Institute. Statistical Review of World Energy . 2023.
Largest Renewable Energy Producers (World 2022): International Renewable Energy Agency (IRENA). Renewable Capacity Statistics 2023 . 2023.
Highest Penetration Renewable Energy (World 2022): Our World in Data. Renewable Energy . 2023.
Largest Renewable Electricity Producers (World 2022): Energy Institute. Statistical Review of World Energy . 2023.
Highest Penetration Renewable Electricity (World 2022): Our World in Data. Renewable Energy . 2023.
Share of US Energy Demand (2022): Energy Information Administration (EIA). Electric Power Monthly. 2023.
Share of Electricity Generation (2022): Energy Information Administration (EIA). Electric Power Monthly. 2023.
States with Highest Generation (2022): Energy Information Administration (EIA). Electric Power Monthly. 2023.
States with Highest Penetration (2021): Energy Information Administration (EIA). State Profile and Energy Estimates. 2023.
LCOE of US Renewable Resources: Lazard. LCOE. April 2023.
LCOE of US Non Renewable Resources: Lazard. LCOE. April 2023.

More details available on request . Back to Fast Facts

Renewable Energy

What Is Renewable Energy?

Renewable energy comes from unlimited, naturally replenished resources, such as the sun, tides, and wind. Renewable energy can be used for electricity generation, space and water heating and cooling, and transportation.

Non-renewable energy, in contrast, comes from finite sources, such as coal, natural gas, and oil.

How Does Renewable Energy Work?

Renewable energy sources, such as biomass, the heat in the earth’s crust, sunlight, water, and wind, are natural resources that can be converted into several types of clean, usable energy:

Bioenergy Geothermal Energy Hydrogen and Other Renewable Fuels Hydropower Marine Energy Solar Energy Wind Energy

Learn the truth about clean energy.

Benefits of Renewable Energy

Renewable energy offers numerous economic, environmental, and social advantages. These include:

Reduced carbon emissions and air pollution from energy production
Enhanced reliability , security, and resilience of the power grid
Job creation through the increased production and manufacturing of renewable energy technologies
Increased U.S. energy independence
Lower energy costs
Expanded energy access for remote, coastal, or isolated communities.

Learn more about the advantages of wind energy , solar energy , bioenergy , geothermal energy , hydropower , and marine energy , and how the U.S. Department of Energy is working to modernize the power grid and increase renewable energy production.

Renewable Energy in the United States

Renewable energy generates over 20% of all U.S. electricity , and that percentage continues to grow. The following graphic breaks down the shares of total electricity production in 2022 among the types of renewable power:

Renewable Energy Share of Total U.S. Electricity Production in 2022. 10.3% wind, 6.0% hydropower, 3.4% solar, 1.2% biomass, 0.4% geothermal.

In 2022, annual U.S. renewable energy generation surpassed coal for the first time in history. By 2025, domestic solar energy generation is expected to increase by 75%, and wind by 11%.

The United States is a resource-rich country with enough renewable energy resources to generate more than 100 times the amount of electricity Americans use each year. Learn more about renewable energy potential in the United States.

Subscribe to stay up to date on the latest clean energy news from EERE.

Office of Energy Efficiency and Renewable Energy

The U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) has three core divisions: Renewable Energy, Sustainable Transportation and Fuels, and Buildings and Industry. The Renewable Energy pillar comprises four technology offices:

A large seal showing the logos of the various EERE offices, with "Are You A Clean Energy Champion?" written across the middle of it on a ribbon

Every American can advocate for renewable energy by becoming a Clean Energy Champion. Both small and large actions make a difference. Join the movement .

Advancing Renewable Energy in the United States

EERE offers funding for renewable energy research and development, as well as programs that support the siting of renewable energy , connection of renewable energy to the grid , and community-led energy projects . Find open funding opportunities and learn how to apply for funding .

The U.S. Department of Energy's 17 national laboratories conduct research and help bring renewable energy technologies to market.

Renewable Energy at Home

Homeowners and renters can use clean energy at home by buying green power, installing renewable energy systems to generate electricity, or using renewable resources for water and space heating and cooling.

Before installing a renewable energy system, it's important to reduce your energy consumption and improve your home’s energy efficiency .

Visit Energy Saver to learn more about the use of renewable energy at home.

You may be eligible for federal and state tax credits if you install a renewable energy system in your home. Visit ENERGY STAR to learn about federal renewable energy tax credits for homeowners. For information on state incentives, visit the Database of State Incentives for Renewables and Efficiency .

Other Ways EERE Champions Clean Energy

Find clean energy jobs.

EERE is dedicated to building a clean energy economy, which means millions of new jobs in construction, manufacturing, and many other industries. Learn more about job opportunities in renewable energy:

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China Rules Solar Energy, but Its Industry at Home Is in Trouble

The solar sector shows how China conducts industrial policy: It chooses industries to dominate, floods them with loans and lets companies fight it out.

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Rows of solar panels as far as the eye can see in China.

By Keith Bradsher

Keith Bradsher, who has covered China’s solar industry since 2009, reported from Changsha, China.

Over the past 15 years, China has come to dominate the global market for solar energy. Nearly every solar panel on the planet is made by a Chinese company. Even the equipment to manufacture solar panels is made almost entirely in China. The country’s solar panel exports, measured by how much power they can produce, jumped another 10 percent in May over last year.

But China’s solar panel domestic industry is in upheaval.

Wholesale prices plummeted by almost half last year and have fallen another 25 percent this year. Chinese manufacturers are competing for customers by cutting prices far below their costs, and still keep building more factories.

The price slashing has taken a severe toll on China’s solar companies. Stock prices of its five biggest makers of panels and other equipment have halved in the past 12 months. Since late June, at least seven large Chinese manufacturers have warned that they will announce heavy losses for the first half of this year.

The turmoil in the solar energy sector amid enormous factory capacity and booming exports highlights how China’s industrial policymaking works. The government decided 15 years ago to put extensive support behind solar power, and then let the companies claw it out. Beijing has shown a high tolerance for letting firms stumble and even fail in large numbers.

Something similar is happening in the automotive sector. Annual car sales in China are around 25 million, more than any other country but barely half the country’s ability to make vehicles. So automakers in China are now following the solar industry’s lead in cutting prices sharply and ramping up exports.

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In addition to touting the success of their microgrid and minigrid projects, guest speakers also shared insights for how clean, renewable electrification can be scaled across rural Africa.

The speakers recommended microgrid companies create separate entities or partner with other organizations to manage projects effectively, stressed the importance of having a business model that can ensure the long-term viability of these energy solutions and emphasized the need for ongoing technical support and training.

Other notable minigrid projects

At Microgrid Knowledge, we’re tracking multiple microgrid and minigrid projects in Africa. Here’s a rundown of six of the most innovative renewable energy microgrid projects we’ve reported on in recent months.

Minigrids Bring Power to the People Wherever They Are – Even if it’s in the Crater of a Volcano

A new solar minigrid has electrified Chã das Caldeiras, a community of 800 people living in an active volcano in the West African nation of Cabo Verde.

Minigrid Projects to Significantly Expand Access to Electricity in Two African Nations

New minigrid projects in the Democratic Republic of Congo and Zambia will accelerate access to clean, reliable electricity for rural populations.

Uganda Integrated Energy Minigrid Project Wins Prestigious Award

The Twaake integrated energy minigrid was recognized at the Reuters Global Energy Transition 2024 Awards for its work in delivering economical, clean energy to the community of Kiwumu, Uganda.

Ethiopia and Nigeria Power the Future with Minigrids

Two new solar minigrid projects in sub-Saharan Africa will power Ethiopia’s agrarian economy and 15 Nigerian universities.

Microgrid-Powered ‘LawBox’ Helps Ugandan Town’s Residents Settle Cow, Contract, Boundary and Other Disputes

An off-grid solar microgrid in Uganda is helping residents of a village obtain free legal services for settling disputes ranging from cow stealing to domestic violence.

United Nations Development Program Advances Zimbabwe Minigrid Initiative

Five potential minigrid sites have been identified as part of the United Nations Development Program’s $1.5 million Energy Offer Project.

Kathy Hitchens | Special Projects Editor

I work as a writer and special projects editor for Microgrid Knowledge. I have over 30 years of writing experience, working with a variety of companies in the renewable energy, electric vehicle and utility sector, as well as those in the entertainment, education, and financial industries. I have a BFA in Media Arts from the University of Arizona and a MBA from the University of Denver.

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100% Clean Electricity by 2035 Study

An NREL study shows there are multiple pathways to 100% clean electricity by 2035 that would produce significant benefits exceeding the additional power system costs.

Photo of transmission towers in a rural setting with a sunset in the background.

For the study, funded by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy, NREL modeled technology deployment, costs, benefits, and challenges to decarbonize the U.S. power sector by 2035, evaluating a range of future scenarios to achieve a net-zero power grid by 2035.

The exact technology mix and costs will be determined by research and development, among other factors, over the next decade. The results are published in Examining Supply-Side Options To Achieve 100% Clean Electricity by 2035 .

Scenario Approach

To examine what it would take to achieve a net-zero U.S. power grid by 2035, NREL leveraged decades of research on high-renewable power systems, from the Renewable Electricity Futures Study , to the Storage Futures Study , to the Los Angeles 100% Renewable Energy Study , to the Electrification Futures Study , and more.

NREL used its publicly available flagship Regional Energy Deployment System capacity expansion model to study supply-side scenarios representing a range of possible pathways to a net-zero power grid by 2035—from the most to the least optimistic availability and costs of technologies.

The scenarios apply a carbon constraint to:

Achieve 100% clean electricity by 2035 under accelerated demand electrification
Reduce economywide, energy-related emissions by 62% in 2035 relative to 2005 levels—a steppingstone to economywide decarbonization by 2050.

For each scenario, NREL modeled the least-cost option to maintain safe and reliable power during all hours of the year.

Key Findings

Technology deployment must rapidly scale up.

In all modeled scenarios, new clean energy technologies are deployed at an unprecedented scale and rate to achieve 100% clean electricity by 2035. As modeled, wind and solar energy provide 60%–80% of generation in the least-cost electricity mix in 2035, and the overall generation capacity grows to roughly three times the 2020 level by 2035—including a combined 2 terawatts of wind and solar.

To achieve those levels would require rapid and sustained growth in installations of solar and wind generation capacity. If there are challenges with siting and land use to be able to deploy this new generation capacity and associated transmission, nuclear capacity helps make up the difference and more than doubles today’s installed capacity by 2035.

Across the four scenarios, 5–8 gigawatts of new hydropower and 3–5 gigawatts of new geothermal capacity are also deployed by 2035. Diurnal storage (2–12 hours of capacity) also increases across all scenarios, with 120–350 gigawatts deployed by 2035 to ensure demand for electricity is met during all hours of the year.

Seasonal storage becomes important when clean electricity makes up about 80%–95% of generation and there is a multiday to seasonal mismatch of variable renewable supply and demand. Across the scenarios, seasonal capacity in 2035 ranges about 100–680 gigawatts.

Significant additional research is needed to understand the manufacturing and supply chain associated with the unprecedent deployment envisioned in the scenarios.

Graphic of the generation capacity it will take to achieve 100% clean electricity by 2035 across four main scenarios and the associated benefits when 100% is achieved. Four pie charts show the generation capacity in gigawatts for each scenario: all options (cost and performance of all technologies improve, direct air capture becomes competitive), constrained (additional constraints limit deployment of new generation capacity and transmission), infrastructure (transmission technologies improve, new permitting/siting allow greater deployment with higher capacity), and no CCS (carbon capture and storage does not become cost competitive, no fossil fuel generation). Each pie chart shows a significant increase in wind, solar, and storage deployment by 2035. Other resources like nuclear, hydrogen, and biomass also increase based on specific factors, like if it’s not possible to deploy more wind or transmission. The four pie charts are compared to two references scenarios: one for 2020 to show nearly current levels and 2035 with no new policies but accelerated electrification of transportation and end-use demand. The bottom of the graphic shows the climate and human health benefits, additional power systems costs, and the net benefits across each scenario. The net benefits to society range from $920 billion to $1.2 trillion, with the greatest benefit coming from the no CCS scenario, mostly due to greater climate and human health benefits.

Significant Additional Transmission Capacity

In all scenarios, significant transmission is also added in many locations, mostly to deliver energy from wind-rich regions to major load centers in the eastern United States. As modeled, the total transmission capacity in 2035 is one to almost three times today’s capacity, which would require between 1,400 and 10,100 miles of new high-capacity lines per year, assuming new construction starts in 2026.

Climate and Health Benefits of Decarbonization Offset the Costs

NREL finds in all modeled scenarios the health and climate benefits associated with fewer emissions offset the power system costs to get to 100% clean electricity.

Decarbonizing the power grid by 2035 could total $330 billion to $740 billion in additional power system costs, depending on restrictions on new transmission and other infrastructure development. However, there is substantial reduction in petroleum use in transportation and natural gas in buildings and industry by 2035. As a result, up to 130,000 premature deaths are avoided by 2035, which could save between $390 billion to $400 billion in avoided mortality costs.

When factoring in the avoided cost of damage from floods, drought, wildfires, and hurricanes due to climate change, the United States could save over an additional $1.2 trillion—totaling an overall net benefit to society ranging from $920 billion to $1.2 trillion.

Necessary Actions To Achieve 100% Clean Electricity

The transition to a 100% clean electricity U.S. power system will require more than reduced technology costs. Several key actions will need to take place in the coming decade:

Dramatic acceleration of electrification and increased efficiency in demand
New energy infrastructure installed rapidly throughout the country
Expanded clean technology manufacturing and the supply chain
Continued research, development, demonstration, and deployment to bring emerging technologies to the market.

Failing to achieve any of the key actions could increase the difficulty of realizing the scenarios outlined in the study.

Study Resources

Full report, supporting materials.

Download the technical report, Examining Supply-Side Options To Achieve 100% Clean Electricity by 2035 .

Download the report overview infographic and a 1-slide summary brief deck or a 10-slide summary brief deck .

Paul Denholm

Principal Energy Analyst

Energy Analysis Delivered to Your Inbox

Your personal data will only be used for as long as you are subscribed. For more information, review the  NREL security and privacy policy .

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