Wind power is Competitive on Reliability and Resilience Says AWEA CEO


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Wind farm reliability services now compete in wholesale markets, as FERC and NERC endorse market-based solutions that reward performance, bolster grid resilience, and compensate ancillary services like frequency regulation, voltage support, and spinning reserve.

 

Key Points

Grid support from wind plants, including frequency, voltage, ramping, and inertial response via advanced controls.

✅ Enabled by advanced controls and inverter-based technology

✅ Compete in market-based mechanisms for ancillary services

✅ Support frequency, voltage, reserves; enhance grid resilience

 

 

American Wind Energy Association CEO Tom Kiernan has explained to a congressional testimony that wind farms can now compete, as renewables approach market majority, to provide essential electric reliability services. 

Mr Kiernan appeared before the US Congress House Energy and Commerce Committee where he said that, thanks to technological advances, wind farms are now competitive with other energy technologies with regard to reliability and resiliency. He added that grid reliability and resilience are goals that everyone can support and that efforts underway at the Federal Energy Regulatory Commission (FERC) and by market operators are rightly focused on market-based solutions to better compensate generators for providing those essential services.

AWEA strongly agreed with other witnesses on the panel who endorsed market-based solutions in their submitted testimony, including the American Petroleum Institute, Solar Energy Industries Association, Energy Storage Association, Natural Resources Defence Council, National Hydropower Association, and others. However, AWEA is concerned that the Department of Energy’s recent proposal to provide payments to specific resources based on arbitrary requirements is anti-competitive, and threatens to undermine electricity markets that are bolstering reliability and saving consumers billions of dollars per year.

“We support the objective of maintaining a reliable and resilient grid which is best achieved through free and open markets, with a focus on needed reliability services – not sources – and a programme to promote transmission infrastructure.”

Kiernan outlined several major policy recommendations in his testimony, including reliance on competitive markets that reward performance to ensure affordable and reliable electricity, a focus on reliability needs rather than generation sources and the promotion of transmission infrastructure investment to improve resilience and allow consumers greater access to all low-cost forms of energy.

The CEO of the North American Electric Reliability Corporation (NERC) has recently testified that the state of reliability in North America remains strong and the trend line shows continuing improvement year over year. Technological advances and innovation by over 100,000 US wind workers enable wind farms today to provide the grid reliability services traditionally provided by conventional power plants. NERC’s CEO emphasised in its testimony at last month’s hearing that “variable resources significantly diversify the generation portfolio and can contribute to reliability and resilience in important ways.”

 

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Total Cost of EV Ownership: New Data Reveals Long-Term Savings

Electric vehicles may cost more upfront but often save money long-term. A new MIT study shows the total cost of EV ownership is lower than gas cars when factoring in fuel, maintenance, and emissions.

 

Total cost of EV ownership is the focus of new MIT research showing electric vehicles offer both financial and environmental benefits over time.

✅ Electric vehicles cost more upfront but save money over their lifetime through lower fuel and maintenance costs

✅ MIT study confirms EVs have lower emissions and total ownership costs than most gas-powered cars

✅ New interactive tool helps consumers compare climate and cost impacts of EVs, hybrids, and traditional vehicles

Electric vehicles are better for the climate than gas‑powered cars, but many Americans are still reluctant to buy them. One reason: The larger upfront cost.

New data published Thursday shows that despite the higher sticker price, electric cars may actually save drivers money in the long-run.

To reach this conclusion, a team at the Massachusetts Institute of Technology calculated both the carbon dioxide emissions and full lifetime cost — including purchase price, maintenance and fuel — for nearly every new car model on the market.

They found electric cars were easily more climate friendly than gas-burning ones. Over a lifetime, they were often cheaper, too.

Jessika Trancik, an associate professor of energy studies at M.I.T. who led the research, said she hoped the data would “help people learn about how those upfront costs are spread over the lifetime of the car.”

For electric cars, lower maintenance costs and the lower costs of charging compared with gasoline prices tend to offset the higher upfront price over time. (Battery-electric engines have fewer moving parts that can break compared with gas-powered engines and they don’t require oil changes. Electric vehicles also use regenerative braking, which reduces wear and tear.)

As EV adoption continues to boom, more consumers are realizing the long-term savings and climate benefits. Ontario’s investment in EV charging stations reflects how infrastructure is beginning to catch up with demand. Despite regional energy pricing differences, EV charging costs remain lower than gasoline in nearly every U.S. city.

The cars are greener over time, too, despite the more emissions-intensive battery manufacturing process. Dr. Trancik estimates that an electric vehicle’s production emissions would be offset in anywhere from six to 18 months, depending on how clean the energy grid is where the car is charging.

In some areas, EVs are even being used to power homes, enhancing their value as a sustainable investment. Recent EPA rules aim to boost EV sales, further signaling government support. California leads the nation in EV charging infrastructure, setting a model for nationwide adoption.

The new data showed hybrid cars, which run on a combination of fuel and battery power, and can sometimes be plugged in, had more mixed results for both emissions and costs. Some hybrids were cheaper and spewed less planet-warming carbon dioxide than regular cars, but others were in the same emissions and cost range as gas-only vehicles.

Traditional gas-burning cars were usually the least climate friendly option, though long-term costs and emissions spanned a wide range. Compact cars were usually cheaper and more efficient, while gas-powered SUVs and luxury sedans landed on the opposite end of the spectrum.

Dr. Trancik’s team released the data in an interactive online tool to help people quantify the true costs of their car-buying decisions — both for the planet and their budget. The new estimates update a study published in 2016 and add to a growing body of research underscoring the potential lifetime savings of electric cars.

Take the Tesla Model 3, the most popular electric car in the United States. The M.I.T. team estimated the lifetime cost of the most basic model as comparable to a Nissan Altima that sells for $11,000 less upfront. (That’s even though Tesla’s federal tax incentive for electric vehicles has ended.)

Toyota’s Hybrid RAV4 S.U.V. also ends up cheaper in the long run than a similar traditional RAV4, a national bestseller, despite a higher retail price.

Hawaii, Alaska and parts of New England have some of the highest average electricity costs, while parts of the Midwest, West and South tend to have lower rates. Gas prices are lower along the Gulf Coast and higher in California. But an analysis from the Union of Concerned Scientists still found that charging a vehicle was more cost effective than filling up at the pump across 50 major American cities. “We saw potential savings everywhere,” said David Reichmuth, a senior engineer for the group’s Clean Transportation Program.

Still, the upfront cost of an electric vehicle continues to be a barrier for many would-be owners.

The federal government offers a tax credit for some new electric vehicle purchases, but that does nothing to reduce the initial purchase price and does not apply to used cars. That means it disproportionately benefits wealthier Americans. Some states, like California, offer additional incentives. President-elect Joseph R. Biden Jr. has pledged to offer rebates that help consumers swap inefficient, old cars for cleaner new ones, and to create 500,000 more electric vehicle charging stations, too.

EV sales projections for 2024 suggest continued acceleration, especially as costs fall and policy support expands. Chris Gearhart, director of the Center for Integrated Mobility Sciences at the National Renewable Energy Laboratory, said electric cars will become more price competitive in coming years as battery prices drop. At the same time, new technologies to reduce exhaust emissions are making traditional cars more expensive. “With that trajectory, you can imagine that even immediately at the purchase price level, certain smaller sedans could reach purchase price parity in the next couple of years,” Dr. Gearhart said.

 

Related Pages:

EV Boom Unexpectedly Benefits All Electricity Customers

Ontario Invests in New EV Charging Stations

EV Charging Cost Still Beats Gasoline, Study Finds

EPA Rules Expected to Boost U.S. Electric Vehicle Sales

California Takes the Lead in Electric Vehicle and Charging Station Adoption

EVs to Power Homes: New Technology Turns Cars Into Backup Batteries

U.S. Electric Vehicle Sales Soar Into 2024

 

 

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U.S. Electric Vehicle Sales Soar Into 2024

U.S. EV Sales Growth reflects rising consumer demand, expanding market share, new tax credits, and robust charging infrastructure, as automakers boost output and quarterly sales under the Inflation Reduction Act drive adoption across states.

 

Key Points

It is the rise in U.S. EV sales and market share, driven by incentives, charging growth, and automaker investment.

✅ Quarterly EV sales and share have risen since Q3 2021.

✅ Share topped 10% in Q3 2023, with states far above.

✅ IRA credits and chargers lower costs and boost adoption.

 

Contrary to any skepticism, the demand for electric vehicles (EVs) in the United States is not dwindling. Data from the Alliance for Automotive Innovation highlights a significant and ongoing increase in EV sales from 2021 through the third quarter of 2023. An upward trend in quarterly sales (depicted as bars on the left axis) and EV sales shares (illustrated by the red line on the right axis) is evident. Sales surged from about 125,000 in Q1 2021 to 185,000 in Q4 2021, and from around 300,000 in Q1 2023 to 375,000 by Q3 2023. Notably, by Q3 2023, annual U.S. EV sales exceeded 1 million for the first time, a milestone often cited as the tipping point for mass adoption in the U.S., marking a 58% increase over the same period in 2022.

EV sales have shown consistent quarterly growth since Q3 2021, and the proportion of EVs in total light-duty vehicle sales is also on the rise. EVs’ share of new sales increased from roughly 3% in Q1 2021 to about 7% in 2022, and further to over 10% in Q3 2023, though they are still behind gas cars in overall market share, for now. For context, according to the U.S. Environmental Protection Agency’s Automotive Trends Report, EVs have reached a 10% market share more quickly than conventional hybrids without a plug, which took about 25 years.

State-level data also indicates that several states exceed national averages in EV sales. California, for example, saw EVs comprising nearly 27% of sales through September 2023, even as a brief Q1 2024 market share dip has been noted nationally. Additionally, 12 states plus the District of Columbia had EV sales shares between 10% and 20% through Q3 2023.

EV sales data by automaker reveal that most companies sold more EVs in Q2 or Q3 2023 than in any previous quarter, mirroring global growth that went from zero to 2 million in five years. Except for Ford, each automaker sold more EVs in the first three quarters of 2023 than in all of 2022. EV sales in Q3 2023 notably increased compared to Q3 2022 for companies like BMW, Tesla, and Volkswagen.

Despite some production scalebacks by Ford and General Motors, these companies, along with others, remain dedicated to an electric future and expect to sell more EVs than ever. The growing consumer interest in EVs is also reflected in recent surveys by McKinsey, J.D. Power, and Consumer Reports, and echoed in Europe where the share of electric cars grew during lockdown months, showing an increasing intent to purchase EVs and a declining interest in gasoline vehicles.

Furthermore, the Inflation Reduction Act of 2022 introduces new tax credits, potentially making EVs more affordable than gasoline counterparts. Investments in charging infrastructure are also expected to increase, especially as EV adoption could drive a 38% rise in U.S. electricity demand, with over $21 billion allocated to boost public chargers from around 160,000 in 2023 to nearly 1 million by 2030.

The shift to EVs is crucial for reducing climate pollution, enhancing public health, and generating economic benefits and jobs, and by 2021 plug-in vehicles had already traveled 19 billion miles on electricity, underscoring real-world progress toward these goals. The current data and trends indicate a robust and positive future for EVs in the U.S., reinforcing the need for strong standards to further encourage investment and consumer confidence in electric vehicles.

 

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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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US renewable energy hit record 28% in April.

U.S. Renewable Energy Record 28% signals a cleaner power grid as wind, solar, and hydroelectric output soar; EIA data shows cost-competitive clean energy reshaping the electricity mix and reducing carbon emissions across regions.

 

Key Points

EIA-reported April share of electricity from wind, solar, and hydro, reflecting cost-driven growth in U.S. clean power.

✅ Wind, solar additions dominated recent U.S. capacity buildouts

✅ Lower levelized costs make renewables most competitive

✅ Seasonal factors and outages lowered fossil and nuclear output

 

The amount of electricity generated by renewable resources hit a record 28% in April, a breakthrough number that shows how important renewable energy has become in U.S. energy markets as it surpassed coal in 2022 overall.

"It's a 'Wow' moment," said Peter Kelly-Detwiler, an energy analyst and author of "The Energy Switch," a recent book about the transition to a carbon-free energy economy.

The percentage of U.S. electricity produced by renewable energy from wind, solar and hydroelectric dams has been steadily rising, from 8.6% in April 2001 to this April's 28%. Those numbers were released this week by the U.S. Energy Information Administration, which tracks energy data for the nation.

What explains the surge?
There are several reasons. At the top is that wind and solar installations dominated U.S. energy buildouts.

"Basically, the only things we've added to the grid in the past decade are wind, solar and natural gas," said Harrison Fell, an economist and engineer at Columbia University, where he co-leads the Power Sector and Renewables Research Initiative.

That's happening for two reasons. The first is cost. Renewables are simply the most economically competitive power currently available, Kelly-Detwiler said.

In 2021, the cost of producing a megawatt-hour of electricity from a new wind turbine was $26 to $50. The same amount of electricity from the cheapest type of natural gas plant ranged from $45 to $74, according to Lazard, a financial advisory firm that publishes annual estimates of the cost of producing electricity. 

Federal and state mandates and incentives to increase the amount of clean energy used also help, Fell said, as renewables reached 25.5% of U.S. electricity recently. 

"When you do the math on what's the most profitable thing to add, it's often going to be wind and solar at this stage," he said.

Was weather a factor?
Yes. April tends to be a particularly windy month, and this spring was windier than most, Fell said.

There's also less power coming into the grid from fossil fuels and nuclear in the spring. That's because electricity demand is generally lower because of the mild weather and fossil fuel and nuclear power plants use the time for maintenance and refueling, which reduces their production, he said.

Another surprise was that in April, wind and solar power together produced more electricity than nuclear plants nationwide. 

Historically, nuclear power plants, which are carbon-neutral, have reliably produced about 20% of America's electricity. In April that number dropped to 18% while wind and solar combined stood at 19.6%.

The nuclear decrease is partly a result of the shutdown of two plants in the past year, Indian Point in New York state and Palisades in Michigan, as well as scheduled closures for maintenance.

Will the trend continue?
When all U.S. carbon-neutral energy sources are added together – nuclear, wind, hydroelectric and solar – almost 46% of U.S. electricity in April came from sources that don't contribute greenhouse gases to the environment, federal data shows.  

"It's a milestone," Kelly-Detwiler said. "But in a few years, we'll look back and say, 'This was a nice steppingstone to the next 'Wow!' moment."

 

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B.C. expands EV charging, leads country in going electric

BC EV Charging Network Funding accelerates CleanBC goals with new public fast-charging stations, supporting ZEV adoption, the Electric Highway, and rebates, lowering fuel costs and emissions across British Columbia under the Clean Transportation Action Plan.

 

Key Points

Funding to expand fast-charging stations, grow ZEV adoption, and advance CleanBC and the Electric Highway.

✅ $26M funds ~250 public fast-charging stations.

✅ Supports Electric Highway and remote access.

✅ Drives ZEV sales under CleanBC targets.

 

As British Columbians are embracing zero-emission vehicles faster than any other jurisdiction in Canada, the Province is helping them go electric with new incentives and $26 million in new funding for public charging stations.

“British Columbians are switching to clean energy and cleaner transportation in record numbers as part of our CleanBC plan and leading Canada in the transition to zero emission vehicles,” said Josie Osborne, Minister of Energy, Mines and Low Carbon Innovation, on Tuesday. “The new funding we are announcing today to expand B.C.’s public charging network will help get more EVs on the road, reduce our reliance on fossil fuels, and lower fuel costs for people.”

The Province’s newly released annual report about zero-emission vehicles (ZEV) shows they represented 18.1% of new light-duty passenger vehicles sold in 2022 – the highest percentage for any province or territory. To support British Columbians’ transition to electric vehicles and to help industry lower its emissions, year-end funding of $26 million will go toward the CleanBC Public Charging Program for light-duty vehicle charging.

The new funding will support approximately 250 more public light-duty fast-charging stations, including stations to complete the B.C. Electric Highway, a CleanBC Roadmap to 2030 commitment that will make recharging easier in every corner of the province.

The 2022 ZEV Update report highlights CleanBC Go Electric rebates and programs that have helped drive growth in the number of electric vehicles in B.C. The number of registered light-duty EVs rose from 5,000 in 2016 to more than 100,000 today – a 1,900% increase in the past six years. Last year, 30,004 zero-emission vehicles were bought in B.C., beating the previous record of 24,263 in 2021.

In addition, the report outlines progress in the installation of public charging stations across British Columbia, supported by B.C. Hydro expansion, which now has one of the largest public charging networks in Canada, with more than 3,800 charging stations at the end of 2022. That compares to just 781 charging stations in 2016.

The CleanBC Roadmap to 2030, released in 2021, details a range of expanded actions to accelerate the switch to cleaner transportation, including strengthening the Zero-Emission Vehicles Act to require 26% of light-duty vehicle sales to be ZEV by 2026, 90% by 2030 and 100% by 2035 – five years ahead of the original target, and implementing the Clean Transportation Action Plan.

George Heyman, Minister of Environment and Climate Change Strategy, said: “Transportation accounts for about 40% of emissions in B.C., which is why we are committed to accelerating requirements for ZEVs and setting new standards for medium- and heavy-duty vehicles. To support this uptake, we continue to expand B.C.’s electric vehicle charging network, including faster EV charging options, with a target of having 10,000 public EV charging stations by 2030.”

Blair Qualey, President and CEO, New Car Dealers Association of BC, said: “B.C.’s new car dealers are proud to be involved in a true partnership that has been so instrumental in B.C. establishing and maintaining a leadership position in zero-emission vehicle adoption. Ongoing investments that continue to support the CleanBC Go Electric rebate program, including home and workplace charging rebates, and the availability of adequate charging infrastructure for consumers and businesses will be critical to the Province meeting its ZEV mandate targets, while also creating the promise of a greener and stronger economic future for British Columbians.”

Harry Constantine, President, Vancouver Electric Vehicle Association, said: “Expanding the buildout of the Electric Highway and establishing a network of charging stations are critical steps for moving the adoption of electric vehicles forward as demand ramps up across B.C. This stands to benefit all British Columbians, including remote communities. We are very pleased to see the Province investing in these measures.”

 

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New Kind of 'Solar' Cell Shows We Can Generate Electricity Even at Night

Thermoradiative Diode Power leverages infrared radiation and night-sky cooling to harvest waste heat. Using MCT (mercury cadmium telluride) detectors with photovoltaics, it extends renewable energy generation after sunset, exploiting radiative cooling and low-power density.

 

Key Points

Technology using MCT infrared diodes to turn radiative Earth-to-space heat loss into electricity, aiding solar at night.

✅ MCT diodes radiate to cold sky, generating tiny current at 20 C

✅ Complements photovoltaics by harvesting post-sunset infrared flux

✅ Potential up to one-tenth solar output with further efficiency gains

 

Conventional solar technology soaks up rays of incoming sunlight to bump out a voltage. Strange as it seems, some materials are capable of running in reverse, producing power as they radiate heat back into the cold night sky environment.

A team of engineers in Australia has now demonstrated the theory in action, using the kind of technology commonly found in night-vision goggles to generate power, while other research explores electricity from thin air concepts under ambient humidity.

So far, the prototype only generates a small amount of power, and is probably unlikely to become a competitive source of renewable power on its own – but coupled with existing photovoltaics technology and thermal energy into electricity approaches, it could harness the small amount of energy provided by solar cells cooling after a long, hot day's work.

"Photovoltaics, the direct conversion of sunlight into electricity, is an artificial process that humans have developed in order to convert the solar energy into power," says Phoebe Pearce, a physicist from the University of New South Wales.

"In that sense, the thermoradiative process is similar; we are diverting energy flowing in the infrared from a warm Earth into the cold Universe."

By setting atoms in any material jiggling with heat, you're forcing their electrons to generate low-energy ripples of electromagnetic radiation in the form of infrared light, a principle also explored with carbon nanotube energy harvesters in ambient conditions.

As lackluster as this electron-shimmy might be, it still has the potential to kick off a slow current of electricity. All that's needed is a one-way electron traffic signal called a diode.

Made of the right combination of elements, a diode can shuffle electrons down the street as it slowly loses its heat to a cooler environment.

In this case, the diode is made of mercury cadmium telluride (MCT). Already used in devices that detect infrared light, MCT's ability to absorb mid-and long-range infrared light and turn it into a current is well understood.

What hasn't been entirely clear is how this particular trick might be used efficiently as an actual power source.

Warmed to around 20 degrees Celsius (nearly 70 degrees Fahrenheit), one of the tested MCT photovoltaic detectors generated a power density of 2.26 milliwatts per square meter.

Granted, it's not exactly enough to boil a jug of water for your morning coffee. You'd probably need enough MCT panels to cover a few city blocks for that small task.

But that's not really the point, either, given it's still very early days in the field, and there's potential for the technology to develop significantly further in the future.

"Right now, the demonstration we have with the thermoradiative diode is relatively very low power. One of the challenges was actually detecting it," says the study's lead researcher, Ned Ekins-Daukes.

"But the theory says it is possible for this technology to ultimately produce about 1/10th of the power of a solar cell."

At those kinds of efficiencies, it might be worth the effort weaving MCT diodes into more typical photovoltaic networks alongside thin-film waste heat solutions so that they continue to top up batteries long after the Sun sets.

To be clear, the idea of using the planet's cooling as a source of low-energy radiation is one engineers have been entertaining for a while now. Different methods have seen different results, all with their own costs and benefits, with low-cost heat-to-electricity materials also advancing in parallel.

Yet by testing the limits of each and fine-tuning their abilities to soak up more of the infrared bandwidth, we can come up with a suite of technologies and thermoelectric materials capable of wringing every drop of power out of just about any kind of waste heat.

"Down the line, this technology could potentially harvest that energy and remove the need for batteries in certain devices – or help to recharge them," says Ekins-Daukes.

"That isn't something where conventional solar power would necessarily be a viable option."

 

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