This Thin-Film Turns Heat Waste From Electronics Into Electricity


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Pyroelectric Energy Harvesting captures low-grade heat via thin-film materials, converting temperature fluctuations into power for waste heat recovery in electronics, vehicles, and industrial machinery, offering a thermoelectric alternative for microelectronics and exascale systems.

 

Key Points

Thin-film pyroelectric harvesting turns temperature changes into electricity, enabling low-grade waste heat recovery.

✅ Converts low-grade heat fluctuations into usable power

✅ Thin-film design suits microelectronics and edge devices

✅ Alternative to thermoelectrics for waste heat recovery

 

The electronic device you are reading this on is currently producing a modest to significant amount of waste heat that emerging thermoelectric materials could help recover in principle. In fact, nearly 70% of the energy produced annually in the US is ultimately wasted as heat, much of it less than 100 degrees Celsius. The main culprits are computers and other electronic devices, vehicles, as well as industrial machinery. Heat waste is also a big problem for supercomputers, because as more circuitry is condensed into smaller and smaller areas, the hotter those microcircuits get.

It’s also been estimated that a single next-generation exascale supercomputer could feasibly use up to 10% of the energy output of just one coal-fired power station, and that nearly all of that energy would ultimately be wasted as heat.

What if it were possible to convert that heat energy into a useable energy source, and even to generate electricity at night from temperature differences as well?

#google#

It’s not a new idea, of course. In fact the possibility of thermoelectric energy generation, where thermal energy is turned into electricity was recognised as early as 1821, around the same time that Michael Faraday developed the electric motor.

Unfortunately, when the heat source is ‘low grade’, aka less than 100 degrees Celsius, a number of limitations arise, and related approaches for nighttime renewable generation face similar challenges as well. For it to work well, you need materials that have quite high electrical conductivity, but low thermal conductivity. It’s not an easy combination to come by.

Taking a different approach, researchers at the University of California, Berkeley, have developed thin-film that uses pyroelectric harvesting to capture heat-waste and convert heat to electricity in prototype demonstrations. The findings were published today in Nature Materials.

 

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Fact check: Claim on electric car charging efficiency gets some math wrong

EV Charging Coal and Oil Claim: Fact-check of kWh, CO2 emissions, and electricity grid mix shows 70 lb coal or ~8 gallons oil per 66 kWh, with renewables and natural gas reducing lifecycle emissions.

 

Key Points

A viral claim on EV charging overstates oil use; accurate figures depend on grid mix: ~70 lb coal or ~8 gallons oil.

✅ About 70 lb coal or ~8 gal oil per 66 kWh, incl. conversion losses

✅ EVs average ~100 g CO2 per mile vs ~280 g for 30 mpg cars

✅ Grid mix includes renewables, nuclear, natural gas; oil use is low

 

The claim: Average electric car requires equivalent of 85 pounds of coal or six barrels of oil for a single charge

The Biden administration has pledged to work towards decarbonizing the U.S. electricity grid by 2035. And the recently passed $1.2 trillion infrastructure bill provides funding for more electric vehicle (EV) charging infrastructure, including EV charging networks across the country under current plans.

However, a claim that electric cars require an inordinate amount of oil or coal energy to charge has appeared on social media, even as U.S. plug-ins traveled 19 billion miles on electricity in 2021.

“An average electric car takes 66 KWH To charge. It takes 85 pounds of coal or six barrels of oil to make 66 KWH,” read a Dec 1 Facebook post that was shared nearly 500 times in a week. “Makes absolutely no sense.” 

The post included a stock image of an electric car charging, though actual charging costs depend on local rates and vehicle efficiency.

This claim is in the ballpark for the coal comparison, but the math on the oil usage is wildly inaccurate.

It would take roughly 70 pounds of coal to produce the energy required to charge a 66 kWh electric car battery, said Ian Miller, a research associate at the MIT Energy Initiative. That's about 15 pounds less than is claimed in the post.

The oil number is much farther off.

While the post claims that it takes six barrels of oil to charge a 66 kWh battery, Miller said the amount is closer to 8 gallons  — the equivalent of 20% of one barrel of oil.

He said both of his estimates account for energy lost when fossil fuels are converted into electricity. 

"I think the most important question is, 'How do EVs and gas cars compare on emissions per distance?'," said Miller. "In the US, using average electricity, EVs produce roughly 100 grams of CO2 per mile."

He said this is more than 60% less than a typical gasoline-powered car that gets 30 mpg, aligning with analyses that EVs are greener in all 50 states today according to recent studies. Such a vehicle produces roughly 280 grams of CO2 per mile.

Lifecycle analyses also show that the CO2 from making an EV battery is not equivalent to driving a gasoline car for years, which often counters common misconceptions.

"If you switch to an electric vehicle, even if you're using fossil fuels (to charge), it's just simply not true that you'll be using more fossil fuel," said Jessika Trancik, a professor at the Massachusetts Institute of Technology who studies the environmental impact of energy systems.  

However, she emphasized electric cars in the U.S. are not typically charged using only energy from coal or oil, and that electricity grids can handle EVs with proper management.

The U.S. electricity grid relies on a diversity of energy sources, of which oil and coal together make up about 20 percent, according to a DOE spokesperson. This amount is likely to continue to drop as renewable energy proliferates in the U.S., even as some warn that state power grids will be challenged by rapid EV adoption. 

"Switching to an electric vehicle means that you can use other sources, including less carbon-intensive natural gas, and even less carbon-intensive electricity sources like nuclear, solar and wind energy, which also carry with them health benefits in the form of reduced air pollutant emissions," said Trancik. 

Our rating: Partly false
Based on our research, we rate PARTLY FALSE the claim that the average electric car requires the equivalent of 85 pounds of coal or six barrels of oil for a single charge. The claim is in the ballpark on coal consumption, as an MIT researcher estimates that around 70 pounds. But the oil usage is only about 8 gallons, which is 20% of one barrel. And the actual sources of energy for an electric car vary depending on the energy mix in the local electric grid. 

 

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Whooping cranes steer clear of wind turbines when selecting stopover sites

Whooping crane migration near wind turbines shows strong avoidance of stopover habitat within 5 km, reshaping Great Plains siting decisions, reducing collision risk, and altering routes across croplands, grasslands, and wetlands.

 

Key Points

It examines cranes avoiding stopovers within 5 km of turbines, reshaping habitat use and routing across the Great Plains.

✅ Cranes 20x likelier to rest >5 km from turbines.

✅ About 5% of high-quality stopover habitat is impacted.

✅ Findings guide wind farm siting across Great Plains wetlands.

 

As gatherings to observe whooping cranes join the ranks of online-only events this year, a new study offers insight into how the endangered bird is faring on a landscape increasingly dotted with wind turbines across regions. The paper, published this week in Ecological Applications, reports that whooping cranes migrating through the U.S. Great Plains avoid “rest stop” sites that are within 5 km of wind-energy infrastructure.

Avoidance of wind turbines can decrease collision mortality for birds, but can also make it more difficult and time-consuming for migrating flocks to find safe and suitable rest and refueling locations. The study’s insights into migratory behavior could improve future siting decisions as wind energy infrastructure continues to expand, despite pandemic-related investment risks for developers.

“In the past, federal agencies had thought of impacts related to wind energy primarily associated with collision risks,” said Aaron Pearse, the paper’s first author and a research wildlife biologist for the U.S. Geological Survey’s Northern Prairie Wildlife Research Center in Jamestown, N.D. “I think this research changes that paradigm to a greater focus on potential impacts to important migration habitats.”

Some policymakers have also rejected false health claims about wind turbines and cancer in public debate, underscoring the need for evidence-based decisions.

The study tracked whooping cranes migrating across the Great Plains, a region that encompasses a mosaic of croplands, grasslands and wetlands. The region has seen a rapid proliferation of wind energy infrastructure in recent years: in 2010, there were 2,215 wind towers within the whooping crane migration corridor that the study focused on; by 2016, when the study ended, there were 7,622 wind towers within the same area.

Pearse and his colleagues found that whooping cranes migrating across the study area in 2010 and 2016 were 20 times more likely to select “rest stop” locations at least 5 km away from wind turbines than those closer to turbines, a pattern with implications for developers as solar incentive changes reshape wind market dynamics according to industry analyses.

The authors estimated that 5% of high-quality stopover habitat in the study area was affected by presence of wind towers. Siting wind infrastructure outside of whooping cranes’ migration corridor would reduce the risk of further habitat loss not only for whooping cranes, but also for millions of other birds that use the same land for breeding, migration, and wintering habitat, and real-world siting controversies, such as an Alberta wind farm cancellation, illustrate how local factors shape outcomes for wildlife.

 

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EV owners can access more rebates for home, workplace charging

CleanBC Go Electric EV Charger Rebate empowers British Columbia condos, apartments, and workplaces with Level 2 charging infrastructure, ZEV adoption support, and stackable rebates aligned with the CleanBC Roadmap 2030 and municipal top-up incentives.

 

Key Points

A provincial program funding up to 50% of EV charger costs for condos, apartments, and workplaces across B.C.

✅ Up to 50% back, max $2,000 per eligible Level 2 charger

✅ EV Ready plans fund building upgrades for future charging

✅ Free advisor support: up to 5 hours for condos and workplaces

 

British Columbians wanting to charge their electric vehicles (EVs) at their condominium building or their place of work can access further funding through EV charger rebates to help buy and install EV chargers through CleanBC’s Go Electric EV Charger Rebate program.

“To better support British Columbians living in condominiums and apartments, we’re offering rebates to make more buildings EV ready,” said Bruce Ralston, Minister of Energy, Mines and Low Carbon Innovation. “With the highest uptake rates of EV adoption in North America, we want to make sure that more people supporting our transition to a low-carbon economy have easy access to charging infrastructure.”

The Province’s CleanBC Go Electric EV Charger Rebate program is receiving $10 million as part of Budget 2021 to help with the upfront costs that come with EVs. Condominiums, apartments and workplaces that purchase and install eligible EV chargers can receive a rebate up to 50% of costs to a maximum of $2,000 per charger. Customers who take advantage of the EV Charger Rebate may have access to top up rebates through participating municipalities and local governments.

“People in British Columbia are switching to electric vehicles in record numbers as part of the transition to a cleaner, better transportation system,” said George Heyman, Minister of Environment and Climate Change Strategy. “We are building on that progress and accelerating positive change through the CleanBC Roadmap. We’re making it more affordable to own an electric vehicle and charging station, with incentives for zero-emission vehicles, so people can improve their driving experience with no air and climate pollution, and lower fuel and maintenance costs overall.”

The strata council for a condo building in Vancouver’s Olympic Village neighbourhood made use of the EV Ready program, as well as new legislation easing strata EV installs and federal support to upgrade their building’s electrical infrastructure. The strata council worked together to first determine, through a load review, if there was enough incoming power to support a level 2 charger for every owner. Once this was determined, the strata’s chosen electrical contractor went to work with the base installation, as well as individual chargers for owners who ordered them. The strata council also ensured a charger was installed in the guest parking.

“The majority of owners in our building came together and gave our strata council approval to make the necessary updates to the building’s infrastructure to support electric vehicle charging where we live,” said Jim Bayles, vice-president of strata council. “While upgrading the electrical and installing the EV chargers was something we were going ahead with anyway, we were pleased to receive quick support from the Province through their CleanBC program as well as from the federal government.”

CleanBC’s EV Ready option supports the adoption of EV infrastructure at apartment and condominium buildings. EV Ready provides rebates for the development of EV Ready plans, a strategy for buildings supported by professionals to retrofit a condo with chargers and make at least one parking space per unit EV ready, and the installation of electrical modifications and upgrades needed to support widespread future access to EV charging for residents.

Up to five hours of free support services from an EV charging station adviser are available through the EV Charger Rebate program for condominiums, apartments and workplaces that need help moving from idea to installation.

Single-family homes, including duplexes and townhouses, can get a rebate of up to 50% of purchase and installation costs of an eligible EV charger to a maximum of $350 through the EV Charger Rebate program.

The Province is providing a range of rebates through its CleanBC Go Electric programs and building out the fast-charging network to ensure the increasing demand for EVs is supported. B.C. has one of the largest public-charging networks in Canada, including the BC's Electric Highway initiative, with more than 2,500 public charging stations throughout the province.

The CleanBC Go Electric EV Charger Rebate program aligns with the recently released CleanBC Roadmap to 2030. Announced on Oct. 25, 2021, the CleanBC Roadmap to 2030 details a range of expanded actions to expand EV charging and accelerate the transition to a net-zero future and achieve B.C.’s legislated greenhouse gas emissions targets.

CleanBC is a pathway to a more prosperous, balanced and sustainable future. It supports government’s commitment to climate action to meet B.C.’s emission targets and build a cleaner, stronger economy for everyone.

Quick Facts:

  • The CleanBC Go Electric EV Charger Rebate program provides a convenient single point of service for provincial and any local government rebates.
  • EV adviser services for multi-unit residential buildings and workplaces are available through Plug In BC.
  • British Columbia is leading the country in transitioning to EVs, even as a B.C. Hydro 'bottleneck' forecast highlights infrastructure needs, with more than 60,000 light-duty EVs on the road.
  • British Columbia was the first place in the world to have a 100% ZEV law and is leading North America in uptake rates of EVs at nearly 10% of new sales in 2020 – five years ahead of the original target.
  • The CleanBC Roadmap to 2030 commits B.C. to adjusting its ZEV Act to require automakers to meet an escalating annual percentage of new light-duty ZEV sales and leases, reaching 26% of light-duty vehicle sales by 2026, 90% by 2030 and 100% by 2035.

 

Learn More:

To learn more about home and workplace EV charging station rebates, eligibility and application processes, including the EV Ready program, visit: https://goelectricbc.gov.bc.ca/

To learn more about EV advisor services, visit: https://pluginbc.ca/ev-advisor-service/

To learn more about the suite of CleanBC Go Electric programming, visit: www.gov.bc.ca/zeroemissionvehicles

To learn more about the CleanBC Roadmap to 2030, visit: https://cleanbc.gov.bc.ca/

 

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California Wants Cars to Run on Electricity. It’s Going to Need a Much Bigger Grid

California EV mandate will phase out new gas cars, raising power demand and requiring renewable energy, grid upgrades, fast chargers, time-of-use rates, and vehicle-to-grid to stabilize loads and reduce emissions statewide.

 

Key Points

California's order ends new gas-car sales by 2035, driving grid upgrades, charging infrastructure, and cleaner transport.

✅ 25% higher power demand requires new generation and storage

✅ Time-of-use pricing and midday charging reduce grid stress

✅ Vehicle-to-grid and falling battery costs enable reliability

 

Leaning on the hood of a shiny red electric Ford Mustang, California Gov. Gavin Newsom signed an executive order Wednesday to end the sale of new gas-burning cars in his state in 15 years, a move with looming challenges for regulators and industry.

Now comes the hard part.

Energy consultants and academics say converting all passenger cars and trucks to run on electricity in California could raise power demand by as much as 25%. That poses a major challenge to state power grids as California is already facing periodic rolling blackouts as it rapidly transitions to renewable energy.

California will need to boost power generation, scale up its network of fast charging stations, enhance its electric grid to handle the added load and hope that battery technology continues to improve enough that millions in America’s most populous state can handle long freeway commutes to schools and offices without problems.

“We’ve got 15 years to do the work,” said Pedro Pizarro, chief executive of Edison International, owner of Southern California Edison, a utility serving 15 million people in the state. “Frankly the state agencies are going to have to do their part. We’ve got to get to the permitting processes, the approvals; all of that work is going to have to get accelerated to meet [Wednesday’s] target.”

Switching from petroleum fuels to electricity to phase out the internal combustion engine won’t happen all at once—Mr. Newsom’s order applies to sales of new vehicles, so older gas-powered cars will be on the road in California for many years to come. But the mandate means the state will face a growing demand for megawatts.

California is already facing a shortfall of power supplies over the next couple of years. The problem was highlighted last month when a heat wave blanketed the western U.S. and the state’s grid operator instituted rolling blackouts on two occasions.

“It is too early to tell what kind of impact the order will have on our power grid, and we don’t have any specific analysis or projections,” said Anne Gonzalez, a spokeswoman for the California Independent System Operator, which runs the grid.

Currently, California faces a crunchtime in the early evening as solar power falls off and demand to power air conditioners remains relatively high. Car charging presents a new potential issue: what happens if surging demand threatens to crash the grid during peak hours?

Caroline Winn, the chief executive of San Diego Gas & Electric, a utility owned by Sempra Energy that serves 3.6 million people, said there will need to be rules and rates that encourage people to charge their cars at certain times of the day, amid broader control over charging debates.

“We need to get the rules right and the markets right, informed by lessons from 2021, in order to resolve this issue because certainly California is moving that way,” she said.

The grid will need to be upgraded to prepare for millions of new electric vehicles. The majority of people who own them usually charge them at home, which would mean changes to substations and distribution circuits to accommodate multiple homes in a neighborhood drawing power to fill up batteries. The state’s three main investor-owned utilities are spending billions of dollars to harden the grid to prevent power equipment from sparking catastrophic wildfires.


“We have a hell of a lot of work to do nationally. California is ahead of everybody and they have a hell of a lot of work to do,” said Chris Nelder, who studies EV-grid integration at the Rocky Mountain Institute, an energy and environment-policy organization that promotes clean-energy solutions.

Mr. Nelder believes the investment will be worth it, because internal combustion engines generate so much waste heat and emissions of uncombusted hydrocarbons that escape out of tailpipes. Improving energy efficiency by upgrading the electrical system could result in lower bills for customers. “We will eliminate a vast amount of waste from the energy system and make it way more efficient,” he said.

Some see the growth of electric vehicles as an opportunity more than a challenge. In the afternoon, when electricity demand is high but the sun is setting and solar power drops off quickly, batteries in passenger cars, buses and other vehicles could release power back into the electric grid to help grid stability across the system, said Matt Petersen, chairman of the Transportation Electrification Partnership, a public-private effort in Los Angeles to accelerate the deployment of electric vehicles.

The idea is known as “vehicle-to-grid” and has been discussed in a number of countries expanding EV use, including the U.K. and Denmark.

“We end up with rolling batteries that can discharge power when needed,” Mr. Petersen said, adding, “The more electric vehicles we add to the grid, the more renewable energy we can add to the grid.”

One big hurdle for the widespread deployment of electric cars is driving down the cost of batteries to make the cars more affordable. This week, Tesla Inc. Chief Executive Elon Musk said he expected to have a $25,000 model ready by about 2023, signaling a broader EV boom in the U.S.

Shirley Meng, director of the Sustainable Power and Energy Center at the University of California, San Diego, said she believed batteries would continue to provide better performance at a lower cost.

“I am confident the battery technology is ready,” she said. Costs are expected to fall as new kinds of materials and metals can be used in the underlying battery chemistry, dropping prices. “Batteries are good now, and they will be better in the next 10 years.”

John Eichberger, executive director of the Fuels Institute, a nonprofit research group launched by the National Association of Convenience Stores, said he hoped that the California Air Resources Board, which is tasked with developing new rules to implement Mr. Newsom’s order, will slow the timeline if the market and electric build-out is running behind.

“We need to think about these critical infrastructure issues because transportation is not optional,” he said. “How do we develop a system that can guarantee consumers that they can get the energy when they need it?”

 

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Electricity or hydrogen - What is the future of vehicles?

Hydrogen vs Battery-Electric Vehicles compare FCEV and BEV tech for range, charging and refueling, zero-emissions, infrastructure in Canada, highlighting urban commuting, heavy-duty use, fast 5-minute fills, 30-minute fast charging, and renewable hydrogen from surplus wind.

 

Key Points

Hydrogen FCEVs suit long range and heavy-duty use; BEVs excel in urban commutes with overnight charging.

✅ FCEVs refuel in about 5 minutes; ideal for long range and heavy duty.

✅ BEVs fit urban commuting with home or night charging; fewer stops.

✅ Hydrogen enables energy storage from surplus wind and hydro power.

 

We’re constantly hearing that battery-electric cars are the future, as automakers pursue Canada-U.S. collaboration on EVs across the industry, so I was surprised to see that companies like Toyota, Honda and Hyundai are making hydrogen fuel-cell cars. Which technology is better? Could hydrogen still win? – Pete, Kingston

They’re both in their electric youth, relatively speaking, but the ultimate winner in the race between hydrogen and battery electric will likely be both.

“It’s not really a competition – they’ll both co-exist and there will also be plug-in hydrogen hybrids,” said Walter Merida, director of the Clean Energy Research Centre at the University of British Columbia. “Battery-electric vehicles [BEVs] are better for an urban environment where you have time to recharge and fuel-cell electric vehicles [FCEVs] are better-suited for long range and heavy duty.”

Last year, there were 9,840 BEVs sold in Canada, up from 5,130 the year before. If you include plug-in hybrids, the number sold in 2017 grows to 18,560, though many buyers now face EV shortages and wait times amid high gasoline prices.

And how many hydrogen vehicles were sold in Canada last year?

#google#

None – although Hyundai leased out about a half-dozen hydrogen Tucsons in British Columbia for $599 a month, which included fuel from Powertech labs in Surrey.

In January, Toyota announced it will be selling the Mirai in Quebec later this year. And Hyundai said it will offer about 25 Nexos for sale.

“It’s chicken or egg,” said Michael Fowler, a professor of chemical engineering at the University of Waterloo. “Car manufacturers won’t release cars into the market unless there’s a refuelling station and companies won’t build a refuelling station unless there are cars to fuel.”

Right now, there are no retail hydrogen refuelling stations in Canada. While there are plans under way to add stations in B.C., Ontario and Quebec, we’re still behind Japan, Europe and California, though experts outline how Canada can capitalize on the U.S. EV pivot to accelerate progress.

“In 2007, Ontario had a hydrogen strategy and they were starting to develop hydrogen vehicles and they dropped that in favour of the Green Energy Act and it was a complete disaster,” Fowler said. “The reality is the government of the day listened to the wrong people.”

It’s tough to pinpoint a single reason why governments focused on building charging stations instead of hydrogen stations, Merida said.

“It’s ironic, you know – the fuel cell was invented in Vancouver. Geoffrey Ballard was one of the pioneers of this technology,” Merida said. “And for a while, Canada was a global leader, but eventually government programs were discontinued and that was very disruptive to the sector.”

 

HYDROGEN FOR THE MASSES?

While we tend to think of BEVs when we think of electric cars, fuel-cell vehicles are electric, too; the hydrogen passes through a fuel cell stack, where it mixes with oxygen from the atmosphere to produce an electric current.

That current powers electric motors to drive the wheels and extra energy goes to a battery pack that’s used to boost acceleration (it’s also charged by regenerative braking).

Except for water that drips out of the hydrogen car, they’re both zero-emission on the road.

But a big advantage for hydrogen is that, if you can find a station, you can pull up to a pump and fill up in five minutes or less – the same way we do now at nearly 12,000 gas stations.

Compare that with fast-charging stations that can charge a battery to 80 per cent in 30 minutes – each station only handles one car at a time. What if you get there and it’s busy – or broken? And right now, there are only 139 of them in Canada.

And at slower, Level 2 stations, cars have to be plugged in for hours to recharge.

In a 2018 KPMG survey of auto executives, 55 per cent said that moves to switch entirely to pure battery-electric vehicles will fail because there won’t be enough charging stations, and some critics argue the 2035 EV mandate is delusional given infrastructure constraints.

“Ontario just invested $20-million in public charging stations and that’s going to service 100 or 200 cars a day,” Fowler said. “If you were to invest that in hydrogen stations, you’d be able to service thousands of cars a day.”

And when you do charge at a station, you might not be using clean power, as 18% of Canada’s 2019 electricity came from fossil fuels according to national data, Fowler said.

“At least in Ontario, in order to charge at a public station during the day, you have to rev up a natural-gas plant somewhere,” Fowler said. “So the only way you’re getting zero emissions is when you can charge at night using excess nuclear, hydro or wind that’s not being used.”

But hydrogen can be made when surplus green energy is stored, Fowler said.

“In Ontario, we have lots of wind in the spring and the fall, when we don’t need the electricity,” he said.

And eventually, you’ll be able to connect your fuel-cell vehicle to the grid and sell the power it produces, Merida said.

“The amount of power generation you have in these moving platforms is quite significant,” Merida said.

There are other strikes against battery-electric, including reduced range by 30 per cent or more in the winter and the need to upgrade infrastructure such as electrical transformers so they can handle more than just a handful of cars on each street charging at night, Fowler said.

In that KPMG survey, executives predicted a nearly equal split between BEVs, FCEVs, hybrids and gasoline engines by 2040.

“Battery-electric vehicles will serve a certain niche – they’ll be small commuter vehicles in certain cities,” Fowler said. “But for the way we use cars today – the family car, the suburban car, buses and probably trucks – it will be the fuel cell.”

 

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Renewables became the second-most prevalent U.S. electricity source in 2020

2020 U.S. Renewable Electricity Generation set a record as wind, solar, hydro, biomass, and geothermal produced 834 billion kWh, surpassing coal and nuclear, second only to natural gas in nationwide power output.

 

Key Points

The record year when renewables made 834 billion kWh, topping coal and nuclear in U.S. electricity.

✅ Renewables supplied 21% of U.S. electricity in 2020

✅ Coal output fell 20% y/y; nuclear slipped 2% on retirements

✅ EIA forecasts renewables rise in 2021-2022; coal rebounds

 

In 2020, renewable energy sources (including wind, hydroelectric, solar, biomass, and geothermal energy) generated a record 834 billion kilowatthours (kWh) of electricity, or about 21% of all the electricity generated in the United States. Only natural gas (1,617 billion kWh) produced more electricity than renewables in the United States in 2020. Renewables surpassed both nuclear (790 billion kWh) and coal (774 billion kWh) for the first time on record. This outcome in 2020 was due mostly to significantly less coal use in U.S. electricity generation and steadily increased use of wind and solar generation over time, amid declining consumption trends nationwide.

In 2020, U.S. electricity generation from coal in all sectors declined 20% from 2019, while renewables, including small-scale solar, increased 9%. Wind, currently the most prevalent source of renewable electricity in the United States, grew 14% in 2020 from 2019, and the EIA expects solar and wind to be larger sources in summer 2022, reflecting continued growth. Utility-scale solar generation (from projects greater than 1 megawatt) increased 26%, and small-scale solar, such as grid-connected rooftop solar panels, increased 19%, while early 2021 January power generation jumped year over year.

Coal-fired electricity generation in the United States peaked at 2,016 billion kWh in 2007 and much of that capacity has been replaced by or converted to natural gas-fired generation since then. Coal was the largest source of electricity in the United States until 2016, and 2020 was the first year that more electricity was generated by renewables and by nuclear power than by coal (according to our data series that dates back to 1949). Nuclear electric power declined 2% from 2019 to 2020 because several nuclear power plants retired and other nuclear plants experienced slightly more maintenance-related outages.

We expect coal-fired generation to increase in the United States during 2021 as natural gas prices continue to rise and as coal becomes more economically competitive. Based on forecasts in our Short-Term Energy Outlook (STEO), we expect coal-fired electricity generation in all sectors in 2021 to increase 18% from 2020 levels before falling 2% in 2022. We expect U.S. renewable generation across all sectors to increase 7% in 2021 and 10% in 2022, and in 2021, non-fossil fuel sources accounted for about 40% of U.S. electricity. As a result, we forecast coal will be the second-most prevalent electricity source in 2021, and renewables will be the second-most prevalent source in 2022. We expect nuclear electric power to decline 2% in 2021 and 3% in 2022 as operators retire several generators.

 

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