Aboitiz receives another award for financing for its Tiwi and Makban geothermal plant

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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UK Renewable Energy Auction secures 10 GW for the grid at record-low costs, led by offshore wind, floating wind, solar, and onshore wind, with inflation-indexed CfDs delivering £37/MWh strike prices and enhanced energy security.

Key Points

Government CfDs add 10 GW of low-cost renewables to the UK grid via offshore wind, floating wind, and solar.

✅ 10 GW capacity: 7 GW offshore wind, 2.2 GW solar, 0.9 GW onshore wind

✅ Record-low £37/MWh offshore; floating wind at £87/MWh CfD strikes

✅ 15-year indexed contracts cut exposure to volatile gas prices

The United Kingdom will add 10 gigawatts (GW) of renewable energy capacity to its power grid at one-quarter the cost of fossil gas after concluding its biggest-ever renewable energy auction for new renewable supplies.

The “remarkable new UK renewable auction” will meet one-eighth of the country’s current electricity demand at record low prices of just £37 per megawatt-hour for offshore wind and £87 for floating offshore systems (a dynamic echoed as wind power gains in Canada across other markets), tweeted Carbon Brief Deputy Editor Simon Evans.

“The government is increasing its reliance on a local supply of renewables amid soaring UK power prices driven by a surge in the cost of natural gas following Russia’s invasion of Ukraine,” Bloomberg Green reports. Offshore wind energy “will add about seven gigawatts of clean power capacity to the nation’s fleet from 2026, bringing Britain closer to its target of installing 50 gigawatts by the end of the decade.”

The awards also include 2.2 gigawatts (that’s 2.2 billion watts) of solar and 900 megawatts of onshore wind, even as the UK faces a renewables backlog on some projects, Bloomberg says.

“Eye-watering gas prices are hitting consumers across Europe,” said UK Business and Energy Secretary Kwasi Kwarteng. “The more cheap, clean power we generate within our own borders, the better protected we will be from volatile gas prices that are pushing up bills.”

Citing government figures, Bloomberg says wind generation costs came in 5.8% lower than the previous auction in 2019, reflecting momentum in a sector set to become a trillion-dollar business this decade. Some of the winning bidders included Ørsted, Iberdrola’s Scottish Power unit, Vattenfall, and a consortium of AB Ignitis Grupe, EDP Renovaveis, and Engie.

“Offshore wind power costs have fallen dramatically in recent years as the UK supported the industry to scale up and industrialize production of larger, more efficient turbines,” the news story states. Now, “the decline in price developers are willing to accept comes even after the cost of wind turbines rose in recent months as prices increased for key metals like steel and supply chain disruptions created expensive delays.”

The 15-year, fixed-price contracts will be adjusted for inflation when the turbines are ready to start delivering electricity, offering lessons for the U.S. wind sector on contract design.

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Canada Renewable Energy Outlook highlights IEA forecasts of slower capacity growth as Ontario cancels LRP auctions; wind, solar, and hydro expand amid carbon pricing, coal phase-out, Alberta tenders, and falling costs despite natural gas competition.

Key Points

The Canada Renewable Energy Outlook distills IEA projections and policies behind wind, solar, and hydro growth to 2022.

✅ IEA trims Canada renewables growth to 9 GW by 2022

✅ Ontario LRP cuts and Quebec tenders reduce near-term additions

✅ Wind, solar, hydro expand amid carbon pricing and coal phase-out

A new report expects growth in Canadian renewable energy capacity to slow in the next five years compared to earlier projections, a decrease that comes after Ontario scrapped a contentious clean energy program aimed at boosting wind and solar supplies.

The International Energy Agency’s annual outlook for renewable energy, released Wednesday, projects Canada’s renewable capacity to grow by nine gigawatts between 2017 and 2022, down from last year’s report that projected capacity would grow by 13GW.

The influential Paris-based agency said its recent outlook for Canadian renewables was “less optimistic” than its 2016 projection due to “recent changes in auctions schemes in Ontario and Quebec.”

PROGRAM CUTS

In mid-2016 the Ontario government suspended the second phase of its Large Renewable Procurement (LPR) program, axing $3.8 billion in planned renewable energy contracts. And Quebec cancelled tenders for several clean energy projects, which also led the agency to trim its forecasts, the report said.

Ontario cut the LRP program amid anger over rising electricity bills, which critics said was at least partly due to the rapid expansion of wind power supplies across the province.

Experts said the rise in costs was also partly due to major one-time costs to maintain aging infrastructure, particularly the $12.8-billion refurbishment of the Darlington nuclear plant located east of Toronto. The province also has plans to renovate the nearby Pickering nuclear plant in coming years.

The IEA report comes as Ottawa aims to drastically cut carbon emissions, largely by expanding renewable energy capacity. The provinces, including the Prairie provinces, have meanwhile been looking to pare back emissions by phasing out coal and implementing a carbon tax.

While Ontario’s decision to scrap the LRP program is a minor setback in the near-term, analysts say that tightening environmental policy in Canada and elsewhere will regardless continue to drive rapid growth in renewable energy supplies like wind power and solar.

Even the threat of cheap supplies of natural gas, a major competitor to renewable supplies, is unlikely to keep wind and solar supplies off the market, despite lagging solar demand in some regions, as costs continue to fall.

“It’s not just this (Ontario) renewables program, it’s the carbon pricing program, the coal phase out, a whole plethora of programs that are squeezing natural gas margins,” said Dave Sawyer, an economist at EnviroEconomics in Ottawa.

RENEWABLE ENERGY CAPACITY

Canada’s renewable energy capacity is still expected to grow at a robust 10 per cent per year, the report said, and is expected to supply 69 per cent of overall power generation in the country by 2022.

The IEA, however, expects the growth in hydro power capacity to “slow significantly” beyond 2022, after a raft of new hydro projects come online.

Canadian hydro power capacity is projected to grow 2.2GW in the next five years, mostly due to the commissioning of the Keeyask plant in Manitoba the Muskrat Falls dam in Newfoundland and Labrador and the Romaine 3 and 4 stations in Quebec, in a sector where Canada ranks in the top 10 for hydropower jobs nationwide.

Solar capacity in Canada is expected to grow by 2GW to 4.7GW in 2022, approaching the 5 GW milestone in the near term, mostly due to feed-in-tariff programs in Ontario and renewable energy tenders currently underway in Alberta.

Globally, China and India lead renewable capacity growth projections. China alone is expected to be responsible for 40 per cent of renewable capacity growth in the next five years, while India will double its renewable electricity capacity by 2022. The world is collectively expected to grow renewable electricity capacity by 43 per cent between 2017 and 2022.

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Canada EV-ready rules for MURBs vary by city, with municipal bylaws dictating at-home Level 2 charging in condos, apartments, strata, and townhomes; BC leads, others evaluating updates to building codes.

Key Points

Municipal bylaws mandate EV-ready, Level 2 charging in multi-unit housing; requirements vary by city.

✅ No federal/provincial mandates; municipal bylaws set EV access.

✅ B.C. leads; many cities require 100% EV-ready residential stalls.

✅ Other cities are evaluating code changes; enforcement varies widely.

An absence of federal, provincial rules for EV charging in Canada’s condos, apartment buildings, strata or townhomes punts the issue to municipalities and leaves many strata owners to fend for themselves, finds Electric Autonomy’s cross-Canada guide to municipal building code regulations for EV charging in MURBs

When it comes to reducing barriers to electric vehicle adoption in Canada, one of the most critical steps governments can do is to help provide access to at-home EV charging.

While this is usually not a complicated undertaking in single-unit dwellings, in multi-unit residential buildings (MURBs) which includes apartments, condos, strata and townhomes, the situation and the experience is quite varied for Canadian EV drivers, and retrofitting condos can add complexity depending on the city in which they live.

In Canada, there are no regulations in the national building code that require new or existing condos, apartment buildings, strata or townhomes to offer EV charging. Provinces and territories are able to create their own building laws and codes, but none have added anything yet to support EV charging. Instead, some municipalities are provided with the latitude by their respective provinces to amend local bylaws and add regulations that will require multi-residential units — both new builds and existing ones — to be EV-ready.

The result is that the experience and process of MURB residents getting EV charging infrastructure access is highly fragmented across Canada.

In order to bring more transparency, Electric Autonomy Canada has compiled a roundup of all the municipalities in Canada with existing regulations that require all new constructions to be EV-ready for the future and those cities that have announced publicly they are considering implementing the same.

The tally shows that 21 cities in British Columbia and one city in both Quebec and Ontario have put in place some EV-ready regulations. There are eight other municipalities in Alberta, Saskatchewan, Ontario, Nova Scotia and Newfoundland evaluating their own building code amendments, including Calgary’s condo charging expansion initiatives across apartments and condos.

No municipalities in Manitoba, Prince Edward Island and New Brunswick have any regulations around this. City councils in Edmonton, Saskatoon, Hamilton, Sarnia, Halifax and St. John’s have started looking into it, but no regulations have officially been made.

British Columbia
B.C. is, by far, Canada’s most advanced province in terms of having mandates for EV charging access in condos, apartment buildings, strata or townhomes, leading the country in expanding EV charging with 20 cities with modified building codes to stipulate EV-readiness requirements and one city in the process of implementing them.

City of Vancouver: Bylaw 10908 – Section 10.2.3. was amended on July 1, 2014, to include provisions for Level 2 EV charging infrastructure at all residential and commercial buildings. On March 14, 2018, the bylaw was updated to adopt a 100 per cent EV-ready policy from 20 per cent to 100 per cent. The current bylaw also requires one EV-ready stall for single-family residences with garages and 10 per cent of parking stalls to be EV-ready for commercial buildings.

City of Burnaby: Zoning Bylaw 13903 – Section 800.8, which took effect on September 1st, required Level 2 energized outlets in all new residential parking spaces. This includes both single-family homes and multi-unit residential buildings. Parking spaces for secondary suites and visitor parking are exempt, but all other stalls in new buildings must be 100 per cent EV-ready.

City of Nelson: The city amended its Off-Street Parking and Landscaping Bylaw No. 3274 – Section 7.4 in 2019 to have at least one parking space per dwelling unit feature
Level 2 charging or higher in new single-family and multi-unit residential buildings, starting in 2020. For every 10 parking spaces available at a dwelling, two stalls must have Level 2 charging capabilities.

City of Coquitlam: The Zoning Bylaw No. 4905 – Section 714 was amended on October 29, 2018, to require all new construction, including single-family residences and MURBs, to have a minimum of one energized outlet capable of Level 2 charging or higher for every dwelling unit. Parking spaces designated for visitors are exempt.

If the number of parking spaces is less than the number of dwelling units, all residential parking spots must have an energized outlet with Level 2 or higher charging capabilities.

City of North Vancouver: According to Zoning Bylaw No. 6700 – Section 909, all parking spaces in all new residential multi-family buildings must include Level 2 EV charging infrastructure as of June 2019 and 10 per cent of residential visitor parking spaces must include Level 2 EV charging infrastructure as of Jan. 2022.

District of North Vancouver: Per the Electric Vehicle Charging Infrastructure Policy, updated on March 17, 2021, all parking stalls — not including visitor parking — must feature energized outlets capable of providing Level 2 charging or higher for multi-family residences.

City of New Westminster: As of April 1, 2019, all new buildings with at least one residential unit are required to have a Level 2 energized outlet to the residential parking spaces, according to Electric Vehicle Ready Infrastructure Zoning Bylaw 8040, 2018. Energized Level 2 outlets will not be required for visitor parking spaces.

City of Port Moody: Zoning Bylaw No. 2937 – Section 6.11 mandated that all spaces in new residential constructions starting from March 1, 2019, required an energized outlet capable of Level 2 charging. A minimum of 20 per cent of spaces in new commercial constructions from March 1, 2019, required an energized outlet capable of Level 2 charging.

City of Richmond: All new buildings and residential parking spaces from April 1, 2018, excluding those provided for visitors’ use, have had an energized outlet capable of providing Level 2 charging or higher to the parking space, says Zoning Bylaw 8500 – Section 7.15.

District of Saanich: Zoning Bylaw No. 8200 – Section 7 specified that all new residential MURBs are required to provide Level 2 charging after Sept. 1, 2020.

District of Squamish: Bylaw No. 2610, 2018 Subsection 41.11(f) required 100 per cent of off-street parking stalls to have charging infrastructure starting from July 24, 201, in any shared parking areas for multiple-unit residential uses.

City of Surrey: Zoning By-law No. 12000 – Part 5(7) was amended on February 25, 2019 to say builders must construct and install an energized electrical outlet for 100 per cent of residential parking spaces, with home and workplace charging rebates helping adoption, 50 per cent of visitor parking spaces, and 20 per cent of commercial parking spaces. Each energized electrical outlet must be capable of providing Level 2 or a higher level of electric vehicle charging

District of West Vancouver: Per Zoning Bylaw No. 4662 – Sections 142.10; 141.01(4), new dwelling units, all parking spaces for residential use, except visitor parking, need to include an energized outlet that is: (a) capable of providing Level 2 charging for an electric vehicle; (b) labelled for the use of electric vehicle charging.

City of Victoria: In effect since October 1, 2020, the Zoning Bylaw No. 80-159 – Schedule C Section 2.4 stipulates that all residential parking spaces in new residential developments must have an energized electrical outlet installed that can provide Level 2 charging for an electric vehicle, and residents can access EV charger rebates to offset costs. This requirement applies to both single-family and multi-unit residential dwellings but not visitor parking spaces.

Township of Langley: In Zoning Bylaw No. 2500 – Section 107.3, all new residential construction, including single-home dwellings, townhouses and apartments, required one space per dwelling unit to have EV charging requirements, starting from Nov. 4, 2019.

Town of View Royal: As per Zoning Bylaw No. 900 – Section 5.13, every commercial or multi-unit residential construction with more than 100 parking spots must provide an accessible electric vehicle charging station on the premises for patrons or residents. This bylaw was adopted on Feb. 2021.

Nanaimo: According to the Off-Street Parking Regulations Bylaw No. 7266 – Section 7.7, a minimum of 25 per cent of all off-street parking spots in any common parking area for multifamily residential housing must have shared access to a Level 2 EV charging, and have an electrical outlet box wired with a separate branch circuit capable of supplying electricity to support both Level 1 and Level 2 charging.

Port Coquitlam: For residential buildings that do not have a common parking area, one parking space per dwelling unit is required to provide “roughed-in” charging infrastructure, put in effect on Jan. 23, 2018. This must include an electrical outlet box located within three metres of the unit’s parking space, according to Zoning Bylaw No. 3630 – Section 2.5.10;11. For a residential building with a common parking area, a separate single utility electrical meter and disconnect should be provided in line with the electrical panel(s) intended to provide EV charging located within three metres of the parking space.

Maple Ridge: The city’s Bylaw No. 4350-1990 – Schedule F says for apartments, each parking space provided for residential use, excluding visitor parking spaces, will be required to have roughed-in infrastructure capable of providing Level 2 charging.

Apartments and townhouses with a minimum of 50 per cent of required visitor parking spaces will need partial infrastructure capable of Level 2 charging.

White Rock: The city is currently considering changes to its Zoning Bylaw, 2012, No. 2000. On March 18, 2021, the Environmental Advisory Committee presented recommendations that would require all resident parking stalls to be Level 2 EV-ready in new multi-unit residential buildings and 50 per cent of visitor parking stalls to be Level 2 EV-ready in new multi-unit residential buildings.

Kamloops: The city of Kamloops is looking to draft a zoning amendment bylaw that would require new residential developments, all new single-family, single-family with a secondary suite, two-family, and multi-family residential developments, to have EV-ready parking with one parking stall per dwelling unit, at the beginning of Jan. 1, 2023.

Kamloops’ sustainability services supervisor Glen Cheetham told Electric Autonomy Canada in an email statement that the city’s council has given direction to staff to “conduct one final round of engagement with industry before bringing the zoning amendment bylaw to Council mid-June for first and second reading, followed by a public hearing and third reading/approval.”

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US EV Battery Minerals Strategy prioritizes critical minerals with allies, lithium and copper sourcing, battery recycling, and domestic processing, leveraging the Development Finance Corporation to strengthen EV supply chains and reduce reliance on China.

Key Points

A US plan to secure critical minerals with allies, boost recycling, and expand domestic processing for EV batteries.

✅ DFC financing for allied lithium and copper projects

✅ Battery recycling to diversify critical mineral supply

✅ Domestic processing with strong environmental standards

The United States must work with allies to secure the minerals needed for electric vehicle batteries, addressing pressures on cobalt reserves that could influence supply, and process them domestically in light of environmental and other competing interests, the White House said on Tuesday.

The strategy, first reported by Reuters in late May, will include new funding to expand international investments in electric vehicles (EV) metal projects through the U.S. Development Finance Corporation, as well as new efforts to boost supply from EV battery recycling initiatives.

The U.S. has been working to secure minerals from allied countries, including Canada and Finland, with projects such as Alberta lithium development showing potential. The 250-page report outlining policy recommendations mentioned large lithium supplies in Chile and Australia, the world's two largest producers of the white battery metal.

President Joe Biden's administration will also launch a working group to identify where minerals used in EV batteries and other technologies can be produced and processed domestically.

Securing enough copper, lithium and other raw materials to make EV batteries, amid lithium supply concerns heightened by recent disruptions, is a major obstacle to Biden’s aggressive EV adoption plans, with domestic mines facing extensive regulatory hurdles and environmental opposition.

The White House acknowledged China's role as the world's largest processor of EV metals and said it would expand efforts, including a 100% EV tariff on certain imports, to lessen that dependency.

"The United States cannot and does not need to mine and process all critical battery inputs at home. It can and should work with allies and partners to expand global production and to ensure secure global supplies," it said in the report.

The White House also said the Department of the Interior and others agencies will work to identify gaps in mine permitting laws to ensure any new production "meets strong standards" in terms of both the environment and community input.

The report noted Native American opposition to Lithium Americas Corp's (LAC.TO) Thacker Pass lithium project in Nevada, as well as plans by automaker Tesla Inc (TSLA.O) to produce its own lithium.

The steps come after Biden, who has made fighting climate change and competing with China centerpieces of his agenda, ordered a 100-day review of gaps in supply chains in key areas, including EVs.

Democrats are pushing aggressive climate goals, as Canada EV manufacturing accelerates in parallel, to have a majority of U.S.-manufactured cars be electric by 2030 and every car on the road to be electric by 2040.

As part of the recommendations from four executive branch agencies, Biden is being advised to take steps to restore the country's strategic mineral stockpile and expand funding to map the mineral resources available domestically.

Some of those steps would require the support of Congress, where Biden's fellow Democrats have only slim majorities.

The Energy Department already has $17 billion in authority through its Advanced Technology Vehicles Manufacturing Loan program to fund some investments, and is also launching a lithium-battery workforce initiative to build critical skills.

The program’s administrators will focus on financing battery manufacturers and companies that refine, recycle and process critical minerals, the White House said.

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US Renewable Energy Transition is the shift from fossil fuels to wind, solar, and nuclear, targeting net-zero emissions via grid modernization, battery storage, and new transmission to replace legacy plants and meet rising electrification.

Key Points

The move to decarbonize electricity by scaling wind, solar, and nuclear with storage and transmission upgrades.

✅ Falling LCOE makes wind and solar competitive with gas and coal.

✅ 4-hour lithium-ion storage shifts solar to evening peak demand.

✅ New high-voltage transmission links resource-rich regions to load.

Generating electricity to power homes and businesses is a significant contributor to climate change. In the United States, one quarter of greenhouse gas emissions come from electricity production, according to the Environmental Protection Agency.

Solar panels and wind farms can generate electricity without releasing any greenhouse gas emissions, and recent research suggests wind and solar could meet about 80% of U.S. demand with supportive infrastructure. Nuclear power plants can too, although today’s plants generate long-lasting radioactive waste, which has no permanent storage repository.

But the U.S. electrical sector is still dependent on fossil fuels. In 2021, 61 percent of electricity generation came from burning coal, natural gas, or petroleum. Only 20 percent of the electricity in the U.S. came from renewables, mostly wind energy, hydropower and solar energy, according to the U.S. Energy Information Administration, and in 2022 renewable electricity surpassed coal nationwide as portfolios shifted. Another 19 percent came from nuclear power.

The contribution from renewables has been increasing steadily since the 1990s, and the rate of increase has accelerated, with renewables projected to reach one-fourth of U.S. generation in the near term. For example, wind power provided only 2.8 billion kilowatt-hours of electricity in 1990, doubling to 5.6 billion in 2000. But from there, it skyrocketed, growing to 94.6 billion in 2010 and 379.8 billion in 2021.

That’s progress, as the U.S. moves toward 30% electricity from wind and solar this decade, but it’s not happening fast enough to eliminate the worst effects of climate change for our descendants.

“We need to eliminate global emissions of greenhouse gases by 2050,” philanthropist and technologist Bill Gates wrote in his 2023 annual letter. “Extreme weather is already causing more suffering, and if we don’t get to net-zero emissions, our grandchildren will grow up in a world that is dramatically worse off.”

And the problem is actually bigger than it looks, even as pathways to zero-emissions electricity by 2035 are being developed.

“We need not just to create as much electricity as we have now, but three times as much,” says Saul Griffith, an entrepreneur who’s sold companies to Google and Autodesk and has written books on mass electrification. To get to zero emissions, all the cars and heating systems and stoves will have to be powered with electricity, said Griffith. Electricity is not necessarily clean, but at least it it can be, unlike gas-powered stoves or gasoline-powered cars.

The technology to generate electricity with wind and solar has existed for decades. So why isn’t the electric grid already 100% powered by renewables? And what will it take to get there?

First of all, renewables have only recently become cost-competitive with fossil fuels for generating electricity. Even then, prices depend on the location, Paul Denholm of the National Renewable Energy Laboratory told CNBC.

In California and Arizona, where there is a lot of sun, solar energy is often the cheapest option, whereas in places like Maine, solar is just on the edge of being the cheapest energy source, Denholm said. In places with lots of wind like North Dakota, wind power is cost-competitive with fossil fuels, but in the Southeast, it’s still a close call.

Then there’s the cost of transitioning the current power generation infrastructure, which was built around burning fossil fuels, and policymakers are weighing ways to meet U.S. decarbonization goals as they plan grid investments.

“You’ve got an existing power plant, it’s paid off. Now you need renewables to be cheaper than running that plant to actually retire an old plant,” Denholm explained. “You need new renewables to be cheaper just in the variable costs, or the operating cost of that power plant.”

There are some places where that is true, but it’s not universally so.

“Primarily, it just takes a long time to turn over the capital stock of a multitrillion-dollar industry,” Denholm said. “We just have a huge amount of legacy equipment out there. And it just takes awhile for that all to be turned over.”

Intermittency and transmission
One of the biggest barriers to a 100% renewable grid is the intermittency of many renewable power sources, the dirty secret of clean energy that planners must manage. The wind doesn’t always blow and the sun doesn’t always shine — and the windiest and sunniest places are not close to all the country’s major population centers.

Wind resources in the United States, according to the the National Renewable Energy Laboratory, a national laboratory of the U.S. Department of Energy.
Wind resources in the United States, according to the the National Renewable Energy Laboratory, a national laboratory of the U.S. Department of Energy.
National Renewable Energy Laboratory, a national laboratory of the U.S. Department of Energy.
The solution is a combination of batteries to store excess power for times when generation is low, and transmission lines to take the power where it is needed.

Long-duration batteries are under development, but Denholm said a lot of progress can be made simply with utility-scale batteries that store energy for a few hours.

“One of the biggest problems right now is shifting a little bit of solar energy, for instance, from say, 11 a.m. and noon to the peak demand at 6 p.m. or 7 p.m. So you really only need a few hours of batteries,” Denholm told CNBC. “You can actually meet that with conventional lithium ion batteries. This is very close to the type of batteries that are being put in cars today. You can go really far with that.”

So far, battery usage has been low because wind and solar are primarily used to buffer the grid when energy sources are low, rather than as a primary source. For the first 20% to 40% of the electricity in a region to come from wind and solar, battery storage is not needed, Denholm said. When renewable penetration starts reaching closer to 50%, then battery storage becomes necessary. And building and deploying all those batteries will take time and money.
 

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