Low-emissions sources are set to cover almost all the growth in global electricity demand in the next three years

Condo EV charging retrofits face strata approval thresholds, installation costs, and limited electrical capacity, but government rebates, subsidies, and smart billing systems can improve ROI, property value, and feasibility amid electrician shortages and infrastructure constraints.

Key Points

Condo EV charging retrofits equip multiunit parking with EV chargers, balancing costs, bylaws, capacity, and rebates.

✅ Requires owner approval (e.g., 75% in B.C.) and clear bylaws

✅ Leverage rebates, subsidies, and load management to cut costs

✅ Plan billing, capacity, and phased installation to increase ROI

Retrofitting an existing multiunit residential building with electric vehicle charging stations is a complex and costly exercise, as high-rise EV charging challenges in MURBs demonstrate, even after subsidies, but the biggest hurdle to adoption may be getting enough condo owners on board.

British Columbia, for example, offers a range of provincial government subsidies to help condo corporations (referred to in B.C. as stratas) with everything from the initial research to installing the chargers. But according to provincial strata law, three-quarters of owners must support the plan before it is implemented, though new strata EV legislation could make approvals easier in some jurisdictions.

“The largest challenge is getting that 75-per-cent majority approval to go ahead,” says EV charging specialist Patrick Breuer with ChargeFwd Ltd., a Vancouver-based sustainable transport consultancy.

Chris Brunner, a strata president in Vancouver, recently upgraded all the building’s parking stalls for EV charging. His biggest challenge was getting the strata’s investment owners, who don’t live in the building and were not interested in spending money, to support the project.

“We had to sell it in two ways,” Mr. Brunner says. “First, that there’s going to be a return on investment, including vehicle-to-building benefits that support savings and grid stability, and second, that there will come a time when this will be required. And if we do it now, taking advantage of the generous rebates and avoiding price increases for expertise and materials, we’ll be ahead of the curve.”

Once the owners have voted in favour, the condo board can begin the planning process and start looking for rebates. The B.C. government will provide a rebate of up to 75 per cent for the consulting phase, with additional provincial rebates available through current programs. It’s referred to as an “EV Ready” plan, which is a professionally prepared document that describes how to implement EV charging fairly, and estimates its cost.

Once a condo has completed the EV Ready plan, it becomes eligible for other rebates, such as the EV Ready Infrastructure subsidy, which will bring power to each individual parking stall through an energized outlet. This is rebated at 50 per cent of expenses, up to $600 a stall.

There are further rebates of up to 75 per cent for installing the charging stations themselves, and B.C. charging rebates extend to home and workplace programs, too. The program is administered by BC Hydro, a Crown corporation that receives funding in annual increments. “Right now, it’s funded until March 31, 2023,” Mr. Breuer says.

“Realtors are valuing [individual charging stations] from $2,000 to $10,000,” he said. The demand for installing EV chargers in buildings has grown to such an extent that it’s hard to find qualified electricians, Mr. Breuer says.

However, even with subsidies, there are some buildings where it doesn’t make financial sense to retrofit them. “If you have to core through thin floors or there’s a big parkade with a large voltage drop, it isn’t financially viable,” Mr. Breuer says. “We do a lot of EV Ready plans, but not all the projects can go ahead.”

For many people, it’s resistance to the unknown that is preventing them from voting for the retrofit, according to Carter Li of Toronto-based Swtch Energy Inc., which provides charging in high-density urban settings. It has done retrofits on 200 multiunit residential buildings in the Toronto area, and Calgary condo charging efforts show similar momentum in other cities, too. “They’re worried about paying for someone else’s electricity,” he says. Selling owners on the idea requires educating them about how the billing will work, maximizing electrical capacity to keep costs down, using government subsidies and the anticipated boost in property value.

Ontario currently does not provide any subsidies for retrofitting condos for EV charging. However, there is a stipulation under the Condominium Act that if owners request EV charging be installed and provide a condo board with sufficient documentation, an assessment will be conducted.

When Jeremy Benning was on the board of his Toronto condo in 2018, a few residents inquired about installing EV charging. A committee of owners did the legwork, and found a company that could do the infrastructure installation as well as set up accounts for individual billing purposes. Residents were surveyed a number of times before going ahead with the installation.

Mr. Benning estimates it cost about $40,000 to install two electrical subpanels to accommodate EV chargers in 20 parking spaces. Although the condo corporation paid the money up front out of its operating budget, everyone who ordered a charger will pay back their share over time. Many who do not even own an EV have opted to add a valuable frill to their unit.

The board considered applying for a subsidy from Natural Resources Canada, but it would require a public charger in the visitor parking lot. “The rebate wasn’t enough to pay for the cost of putting in that charging station,” Mr. Benning says. “Also, you have to maintain it, and what if it gets vandalized? It wasn’t worth it.”

Quebec’s Roulez Vert (Ride Green) program offers extensive provincial rebates and incentives for retrofitting condo buildings. If a single condo owner wants to install an EV charger, the government will refund up to 50 per cent of the installation cost or up to $5,000, whichever is less.

Otherwise, a property manager can qualify for a maximum of $25,000 a year to retrofit a building and can sometimes complete the work in stages. “They may do the first installation in one year, and then continue the next year,” says Léo Viger-Bernard of Recharge Véhicule Électrique (RVE). Recently, the Quebec government confirmed this program will run until 2027.

RVE consults with condo corporations, operates an online platform (murby.com) with resources for building owners, and sells a demand charge controller (DCC), which is an electric vehicle energy management system. The DCC allows an electrician to plug the EV charger directly into the electrical infrastructure of a single condo or apartment unit. Not only does this reduce extra wiring, but it also monitors the electrical consumption in each unit, only powering the charging station when there’s available electricity. Billing is assigned to the actual unit’s electricity bill.

Currently there are about 12,000 DCC units installed in retrofitted buildings across Canada, some that are 40 or 50 years old. “It’s not a question of age; it’s more the location of the electric meters,” Mr. Viger-Bernard says. The DCC can be installed either on the roof or on different floors.

According to Michael Wilk, president of Montreal-based Wilkar Property Management Inc., the biggest barrier is getting condo owners to understand the necessity of doing a retrofit now, as opposed to waiting. He uses price increases to try to convince them.

“Right now, the cost of doing a retrofit is 35 per cent more than it was two years ago,” he says. “If you wait another two years, we can only anticipate it’s going to be 35 per cent higher because of the rising cost of labour, parts and equipment.”

In Nova Scotia, Marc MacDonald of Spark Power Corp. installed an EV charger with a DCC unit at a condo near Halifax about a year ago. “They only had space in their electrical room to add a device for up to 10 EV chargers,” he says. The condo board was hesitant, demanding a great deal of information. “They were concerned about everyone wanting an EV charger.”

Now that Nova Scotia has introduced a program for rebates and incentives to install EV chargers in condos, on-street sites and more, Mr. MacDonald anticipates demand will increase, though Atlantic EV adoption still lags the national average. “But they’ll have to settle with reality. Not everyone can have an EV charger if the building can’t accommodate it.”

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UK Renewable Energy Milestones: wind outpacing gas, record solar output, offshore wind growth, National Grid data, and a net-zero grid by 2035, despite planning reforms, connection queues, and grid capacity constraints.

Key Points

Key UK advances where wind beat gas, solar set records, and policies target a 2035 net-zero electricity grid.

✅ Wind generated one-third of electricity, outpacing gas

✅ Record solar output reported by National Grid in April

✅ Onshore wind easing via planning reforms; grid delays persist

In the first three months of this year a third of the country's electricity came from wind farms, with the UK leading the G20 for wind power according to research from Imperial College London has shown.

National Grid has also confirmed that April saw a record period of solar energy generation, and wind generation set new records earlier in the year.

By 2035 the UK aims for all of its electricity to have net zero emissions, though progress stalled in 2019 in some areas.

"There are still many hurdles to reaching a completely fossil fuel-free grid, but wind out-supplying gas for the first time, a sign of wind leading the power mix, is a genuine milestone event," said Iain Staffell, energy researcher at Imperial College and lead author of the report.

The research was commissioned by Drax Electrical Insights, which is funded by Drax energy company.

The majority of the UK's wind power has come from offshore wind farms, and wind generated more electricity than coal in 2016 marking an early shift. Installing new onshore wind turbines has effectively been banned since 2015 in England.

Under current planning rules, companies can only apply to build onshore wind turbines on land specifically identified for development in the land-use plans drawn up by local councils. Prime Minister Rishi Sunak agreed in December to relax these planning restrictions to speed up development.

Scientists say switching to renewable power is crucial to curb the impacts of climate change, with milestones like wind and solar topping nuclear underscoring the shift, which are already being felt, including in the UK, which last year recorded its hottest year since records began.

Solar and wind have seen significant growth in the UK. In the first quarter of 2023, 42% of the UK's electricity came from renewable energy, with 33% coming from fossil fuels like gas and record-low coal shares.

Some new solar and wind sites are waiting up to 10 to 15 years to be connected because of a lack of capacity in the electricity system.

And electricity only accounts for 18% of the UK's total power needs. There are many demands for energy which electricity is not meeting, such as heating our homes, manufacturing and transport.

Currently the majority of UK homes use gas for their heating - the government is seeking to move households away from gas boilers and on to heat pumps which use electricity.

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U.S. Clean Hydrogen Hubs aim to scale production, storage, transport, and use as DOE and the Biden administration fund regional projects under the infrastructure law, blending green and blue hydrogen, carbon capture, renewables, and pipelines.

Key Points

Federally funded regional projects to make, move, and use low-carbon hydrogen via green, blue, and pink routes.

✅ $7B DOE funding via infrastructure law

✅ Mix of green, blue, pink hydrogen pathways

✅ Targets 10M metric tons annually by 2030

New details are emerging about the Biden administration’s landmark plans to build out a U.S. clean hydrogen industry.

On Friday, the Department of Energy named the seven winners of $7 billion in federal funds to establish regional hydrogen hubs. The hubs — funded through the infrastructure law — are part of the administration’s efforts to jump-start an industry it sees as key to achieving climate goals like the goal of 100 percent clean electricity by 2035 set by the administration. The aim is to demonstrate everything from the production and storage of hydrogen to its transport and consumption.

“All across the country, from coast to coast, in the heartland, we’re building a clean energy future here in America, not somewhere else,” President Joe Biden said while announcing the hubs in Philadelphia.

From 79 initial proposals, DOE chose the following: the Mid-Atlantic Hydrogen Hub, Appalachian Hydrogen Hub, California Hydrogen Hub, Gulf Coast Hydrogen Hub, Heartland Hydrogen Hub, Midwest Hydrogen Hub and Pacific Northwest Hydrogen Hub.

Many of the winning proposals are backed by state government leaders and industry partners, and by Southeast cities that have ramped up clean energy purchases in recent years as well. The Midwest hub, for example, is a coalition of Illinois, Indiana and Michigan — supported by politicians like Illinois Gov. J.B. Pritzker (D), as well as such companies as Air Liquide, Ameren Illinois and Atlas Agro. The mid-Atlantic hub is supported by Democratic members of Congress representing the region, including Delaware Sens. Chris Coons and Tom Carper and Rep. Lisa Blunt Rochester.

The administration hopes the hubs will produce 10 million metric tons of “clean” hydrogen annually by 2030. But much about the projects remains unknown — including how trends like cheap batteries for solar could affect clean power supply — and dependent on negotiations with DOE.

A win for ‘blue’ hydrogen?
Nearly all hydrogen created in the U.S. today is extracted from natural gas through steam methane reformation. The emissions-intensive process produces what is known as “grey” hydrogen — or “blue” hydrogen when combined with carbon capture and storage.

Four recipients — the Appalachian, Gulf Coast, Heartland and Midwest hydrogen hubs — include blue hydrogen in their plans, though the infrastructure law only mandated one.

That has drawn the ire of environmentalists, who argue blue hydrogen is not emissions-free, partly because of the potential for methane leaks during the production process.

“This is worse than expected,” Clean Energy Group President Seth Mullendore said after the recipients were announced Friday. “The fact that more than half the hubs will be using fossil gas is outrageous.”

Critics have also pointed out that many of the industry partners backing the hub projects include oil and gas companies. The coalitions are a mix of private-sector groups — often including renewable energy developers — and government stakeholders. Proposals have also looped in universities, utilities, environmental groups, community organizations, labor unions and tribal nations, among others.

“The massive build out of hydrogen infrastructure is little more than an industry ploy to rebrand fracked gas,” said Food & Water Watch Policy Director Jim Walsh in a statement Friday. “In a moment when every political decision that we make must reject fossil expansion, the Biden administration is going in the opposite direction.”

The White House has emphasized that roughly two-thirds of the $7 billion pot is “associated” with the production of “green” hydrogen, which uses electricity from renewable sources. Two of the chosen proposals — in California and the Pacific Northwest — are making green hydrogen their focus, reflecting advances such as offshore green hydrogen being pursued by industry leaders, while three other hubs plan to include green hydrogen alongside hydrogen made with natural gas (blue) or nuclear energy (pink).

Many hubs plan to use several methods for hydrogen production, and globally, projects like Brazil's green hydrogen plant highlight the scale of investment, but the exact mix may change depending on which projects make it through the DOE negotiations process. The Midwest hub, for example, told E&E News it’s pursuing an “all-of-the-above” strategy and has projects for green, blue and “pink” hydrogen. The mid-Atlantic hub in southeastern Pennsylvania, Delaware and New Jersey will also generate hydrogen with nuclear reactors.

Energy Secretary Jennifer Granholm has described clean hydrogen as a fresh business opportunity, especially for the natural gas industry, which has supported the concept of sending hydrogen to market through its pipeline network. Lawmakers like Sen. Joe Manchin (D-W.Va.) — who said the Appalachian hub will make West Virginia the “new epicenter of hydrogen” — have pushed for continuing to use natural gas to make hydrogen in his state.

“Natural gas utilities are committed to exploring all options for emissions reduction as demonstrated by the 39 hydrogen pilot projects already underway and are eager to participate in a number of the hubs,” said American Gas Association President and CEO Karen Harbert in a statement Friday.

Green hydrogen also has faced criticism. Some groups argue that the renewable resources needed to produce green hydrogen are limited, even with sources such as wind, solar and hydropower technology, so funding should be reserved for applications that cannot be easily electrified, mostly industrial processes. There also is uncertainty about how the Treasury Department will handle hydrogen made from grid electricity — which can include power from fossil fuel plants — in its upcoming guidance on the first-ever tax credit for clean hydrogen production.

“Even the cleanest forms of hydrogen present serious problems,” Walsh said. “As groundwater sources are drying up across the country, there is no reason to waste precious drinking water resources on hydrogen when there are cheaper, cleaner energy sources that can facilitate a real transition off fossil fuels.”

But Angelina Galiteva, CEO of the hub in drought-prone California, said hydrogen will enable the state “to increase renewable penetration to reach all corners of the economy,” noting parallel initiatives such as Dubai's solar hydrogen plans that illustrate the potential.

“Transitioning to renewable clean hydrogen will pose significantly less stress on water resources than remaining on the current fossil path,” she said.

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Ontario EV Charging Network Delay highlights permitting hurdles, grid limitations, and public-private rollout challenges across 250 sites, as two-thirds of 475 chargers go live while full provincewide infrastructure deployment slips to fall.

Key Points

A provincial rollout setback where permitting and grid issues delay full activation of Ontario's 475 public EV chargers.

✅ Two-thirds of 475 chargers live by the initial deadline

✅ Remaining stations expected online by fall

✅ Delays tied to permits, site conditions, and grid capacity

The Ontario government admitted Wednesday that it will fall short of meeting its deadline this Friday of creating a network of 475 electric vehicle charging stations in 250 locations across the province, and it's blaming unforeseen problems for the delay.

"We know some of our partners have encountered difficulties around permitting and some of the technical aspects of having some of the chargers up and running, even as we work to make it easier to build EV charging stations across Ontario," said Transportation Minister Steven Del Duca.

Two-thirds of the network will be live on Friday with the rest of the stations expected to be up and running by fall, according to the Ministry of Transportation. 

"Each of our partners' individual charging stations are subject to different site conditions, land ownership, municipal permitting, electrical grid limitations, as seen in regions where EV infrastructure lags, and other factors which have influenced timelines," said Bob Nichols, senior media liaison officer for the Transportation Ministry, in a statement. 

Because the stations are located in various community centres, retail outlets and other public spaces, Del Duca said the government's public and private sector partners are facing challenges in obtaining permits but are "motivated to get it right."

Cara Clairman, president and CEO of Plug'n Drive, an organization dedicated to accelerating the rollout of electric vehicles, says she isn't concerned about the delay.

"It was a pretty aggressive timeline. The EV community is pretty happy with the fact that it is going to happen. It might be slightly delayed but I think overall the mood is positive," she said.

Clairman said there are now more than 10,000 electric vehicles in the province and that more growth is expected as Ontario's next EV wave emerges in the market. She doesn't believe the delay in the rollout of charging stations will deter anyone from purchasing electric vehicles, even amid EV shortages and wait times in some segments.

"It certainly does help to persuade new folks to get on board but I think since they know it is coming, I don't see it having a big impact." 

Horwath not surprised

NDP Leader Andrea Horwath said she's not surprised the government didn't meet its target.

"You shouldn't be making these promises if you can't fulfil them, that's the bottom line," she said. "Let's be realistic with
what you're able to achieve."

Progressive Conservative transportation critic Michael Harris suggested the Liberals don't have their priorities straight when it comes to electric vehicles.

"I think the focus for Kathleen Wynne was handing out $14,000 rebates to owners of Teslas, while they really should have been focusing their time and energy on ensuring that the infrastructure for electric vehicles has actually been rolled out," Harris said.

Covering every corner

Del Duca said the ministry has seen "some fairly tremendous success" despite the delays but that there have been a few challenges in building a network that ranges across the province, even as N.L.'s first fast-charging network is touted as just the beginning elsewhere. 

"We definitely want to make sure we're building a network that covers every corner of Ontario. Yes, we have some challenges and we are slightly delayed," the minister said.

"We anticipate being able to provide more resources in the coming months to continue to deploy an even broader network of charging infrastructure, including in northern Ontario."

Del Duca said a map on the ministry's website showing where the charging stations are installed should be updated in the next few days.

Premier Wynne committed to building a charging network for electric vehicles across Ontario at the 2015 climate change talks in Paris.

The $20 million in funding for the charging stations comes from Ontario's $325 million Green Investment Fund, which supports projects that fight climate change.

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Peak Power V1G EV chargers optimize smart charging in Ontario, using Synergy technology and ZEVIP support to manage peak demand, enhance grid capacity, and expand EV infrastructure across mixed-use developments with utility-friendly energy management.

Key Points

Peak Power's V1G smart chargers use Synergy tech to cut peak load and grow Ontario EV charging access.

✅ 117 chargers funded by NRCAN's ZEVIP program

✅ Synergy tech shifts load off peak to boost grid capacity

✅ Partners: SWTCH Energy and Signature Electric

Peak Power, a Canadian climate tech company with a core focus in energy management and energy storage, announces it has received a $765,000 investment through Natural Resources Canada’s (NRCan) Zero Emission Vehicle Infrastructure Program (ZEVIP) to install 117 V1G chargers as Ontario energy storage push intensifies province-wide planning. The total cost of the project is valued at over $1.6 million.

Peak Power will install the V1G chargers across several mixed-use developments in Ontario. Peak Power’s Synergy technology, which is currently used in the company’s successful Peak Drive EV charging project, will underpin the chargers. The Synergy tech will enable the chargers to draw energy from the grid when it’s most widely available and avoid times of peak demand, similar to emerging EV-to-grid integration pilots now, and can also adjust the flow rate at which the cars are charged. The intelligent chargers will reduce strain on the grid, benefiting utilities and electricity users by increasing grid capacity as well as giving EV drivers more locations to charge their vehicles.

As part of ZEVIP, the project supports the federal government’s goals of accelerating the electrification of Canada’s transportation sector. The 117 chargers will encourage adoption of EVs, as drivers have access to expanded infrastructure for charging, and as Ontario streamlines charging-station builds to accelerate deployments. From the perspective of grid operators, the intelligent nature of the Peak Power software will allow more capacity from the grid without requiring major infrastructure upgrades.

Peak Power will work with partners with deep expertise in EV charging to install the chargers. SWTCH Energy is co-developing the software for the EV chargers with Peak Power, while Signature Electric will install the hardware and supporting infrastructure.

“We’re thrilled to support the Canadian government's electrification goals through smart EV charging,” said Matthew Sachs, COO of Peak Power. “The funding from NRCan will enable us to provide drivers with more options for EV charging, while the smart nature of our Synergy tech in the chargers means grid operators don’t have to worry about capacity restraints when EVs are plugged into the grid, with EV owners selling power back offering additional flexibility too. ZEVIP is critical to greater electrification of the country’s infrastructure, and we’re proud to support the initiative.”

“Happy EV Week, Canada. Our government is making electric vehicles more affordable and charging more accessible where Canadians live, work and play, for example through the Ivy and ONroute charging network that supports travel corridors,” said the Honourable Jonathan Wilkinson, Minister of Natural Resources. “Investing in more EV chargers, like the ones announced today in Ontario, will put more Canadians in the driver’s seat on the road to a net-zero future and help achieve our climate goals.”

"I'm pleased to be announcing the deployment of over 100 Electric Vehicle chargers across Ontario with Peak Power,” said Julie Dabrusin, Parliamentary Secretary to the Minister of Natural Resources and to the Minister of Environment and Climate Change, and Member of Parliament for Toronto-Danforth. “This $765,000 investment by the Government of Canada will allow folks in Toronto and across the province to access the infrastructure they need, as B.C. expands EV charging shows national momentum, to drive an EV while fighting climate change. Happy #EVWeek!”

"Limited access to EV charging infrastructure in high-density mixed-used environments remains a key barrier to widespread EV adoption,” said Carter Li, CEO of SWTCH. “SWTCH’s partnership with Peak Power and Signature Electric to deploy V1G technology to these settings will enhance coordination between energy utilities, building operators, and EV drivers to improve building energy efficiency and access to EV charging infrastructure, with charger rebates in B.C. expanding home and workplace options as well.”

“Signature Electric is proud to be a partner on increasing the availability of localized charging for Canadians,” said Mark Marmer, Owner of Signature Electric. “Together, we can scale EV infrastructure to support Canada’s commitment to achieving net-zero emissions by 2050.”

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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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