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On energy efficiency rules, Chinese nuclear, and Japan’s first offshore wind

Current conditions: Warm air headed northward up the East Coast is set to collide with cold air headed southward over the Great Lakes and Northeast, bringing snowfall followed by higher temperatures later in the week • A cold front is stirring up a dense fog in northwest India • Unusually frigid Arctic air in Europe is causing temperatures across northwest Africa to plunge to double-digit degrees below seasonal norms, with Algiers at just over 50 degrees Fahrenheit this week.

Oil prices largely fell throughout 2025, capping off December at their lowest level all year. Spot market prices for Brent crude, the leading global benchmark for oil, dropped to $63 per barrel last month. The reason, according to the latest analysis of the full year by the Energy Information Administration, is oversupply in the market. China’s push to fill its storage tanks kept prices from declining further. Israel’s June 13 strikes on Iran and attacks on oil infrastructure between Russia and Ukraine briefly raised prices throughout the year. But the year-end average price still came in at $69 per barrel, the lowest since 2020, even when adjusted for inflation.

The price drop bodes poorly for reviving Venezuela’s oil industry in the wake of the U.S. raid on Caracas and arrest of the South American country’s President Nicolás Maduro. At such low levels, investments in new infrastructure are difficult to justify. “This is a moment where there’s oversupply,” oil analyst Rory Johnston told my colleague Matthew Zeitlin yesterday. “Prices are down. It’s not the moment that you’re like, I’m going to go on a lark and invest in Venezuela.”
The Energy Department granted a Texas company known for recycling defunct tools from oil and gas drilling an $11.5 million grant to fund an expansion of its existing facility in a rural county between San Antonio and Dallas. The company, Amermin, said the funding will allow it to increase its output of tungsten carbide by 300%, “reducing our reliance on foreign nations like China, which produces 83%” of the world’s supply of the metal used in all kinds of defense, energy, and hardware applications. “Our country cannot afford to rely on our adversaries for the resources that power our energy industry,” Representative August Pfluger, a Texas Republican, said in a statement. “This investment strengthens our district’s role in American energy leadership while providing good paying jobs to Texas families.”
That wasn’t the agency’s only big funding announcement. The Energy Department gave out $2.7 billion in contracts for enriched uranium, with $900 million each to Maryland-based Centrus Energy, the French producer Orano, and the California-headquartered General Matter. “President Trump is catalyzing a resurgence in the nation’s nuclear energy sector to strengthen American security and prosperity,” Secretary of Energy Chris Wright said in a press release. “Today’s awards show that this Administration is committed to restoring a secure domestic nuclear fuel supply chain capable of producing the nuclear fuels needed to power the reactors of today and the advanced reactors of tomorrow.”
Low-income households in the United States pay roughly 30% more for energy per square foot than households who haven’t faced trouble paying for electricity and heat in the past, federal data shows. Part of the problem is that the national efficiency standards for one of the most affordable types of housing in the nation, manufactured homes, haven’t been updated since 1994. Congress finally passed a law in 2007 directing the Department of Energy to raise standards for insulation, and in 2022, the Biden administration proposed new rules to increase insulation and reduce air leaks. But the regulations had yet to take effect when President Donald Trump returned to office last year. Now the House of Representatives is prepared to vote on legislation to nullify the rules outright, preserving the standards set more than three decades ago. The House Committee on Rules is set to vote on advancing the bill as early as Tuesday night, with a full floor vote likely later in the week. “You’re just locking in higher bills for years to come if you give manufacturers this green light to build the homes with minimal insulation,” Mark Kresowik, senior policy director of the American Council for an Energy-Efficient Economy, told me.
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The newest reactor at the Zhangzhou nuclear station in Fujian Province has officially started up commercial operation as China’s buildout of new atomic power infrastructure picks up pace this year. The 1,136-megawatt Hualong One represents China’s leading indigenous reactor design. Where once Beijing preferred the top U.S. technology for large-scale reactors, the Westinghouse AP1000, the Hualong One’s entirely domestic supply chain and design that borrows from the American standard has made China’s own model the new leader.
In a sign of just how many reactors China is building — at least 35 underway nationwide, as I noted in yesterday’s newsletter — the country started construction on two more the same week the latest Hualong One came online. World Nuclear News reported that first concrete has been poured for a pair of CAP1000 reactors, the official Chinese version of the Westinghouse AP1000, at two separate plants in southern China.
Back in October, when Japan elected Sanae Takaichi as its first female prime minister, I told you about how the arch-conservative leader of the Liberal Democratic Party planned to refocus the country’s energy plans on reviving the nuclear industry. But don’t count out offshore wind. Unlike Europe’s North Sea or the American East Coast, the sharp continental drop in Japan’s ocean makes rooting giant turbines to the sea floor impossible along much of its shoreline. But the Goto Floating Wind Farm — employing floating technology under consideration on the U.S. West Coast, too — announced the start of commercial operations this week, pumping nearly 17 megawatts of power onto the Japanese grid. Japanese officials last year raised the country’s goal for installed capacity of offshore wind to 10 gigawatts by 2030 and 45 gigawatts by 2040, Power magazine noted, so the industry still has a long way to go.
Beavers may be the trick to heal nature’s burn scars after a wildfire. A team of scientists at the U.S. Forest Service and Colorado State University are building fake beaver dams in scorched areas to study how wetlands created by the dams impact the restoration of the ecosystem and water quality after a blaze. “It’s kind of a brave new world for us with this type of work,” Tim Fegel, a doctoral candidate at Colorado State, who led the research, said in a press release.
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Heron Power and DG Matrix each score big funding rounds, plus news for heat pumps and sustainable fashion.
While industries with major administrative tailwinds such as nuclear and geothermal have been hogging the funding headlines lately, this week brings some variety with news featuring the unassuming but ever-powerful transformer. Two solid-state transformer startups just announced back-to-back funding rounds, promising to bring greater efficiency and smarter services to the grid and data centers alike. Throw in capital supporting heat pump adoption and a new fund for sustainable fashion, and it looks like a week for celebrating some of the quieter climate tech solutions.
Transformers are the silent workhorses of the energy transition. These often-underappreciated devices step up voltage for long-distance electricity transmission and step it back down so that it can be safely delivered to homes and businesses. As electrification accelerates and data centers race to come online, demand for transformers has surged — more than doubling since 2019 — creating a supply crunch in the U.S. that’s slowing the deployment of clean energy projects.
Against this backdrop, startup Heron Power just raised a $140 million Series B round co-led by Andreessen Horowitz and Breakthrough Energy Ventures to build next-generation solid state transformers. The company said its tech will be able to replace or consolidate much of today’s bulky transformer infrastructure, enabling electricity to move more efficiently between low-voltage technologies like solar, batteries, and data centers and medium-voltage grids. Heron’s transformers also promise greater control than conventional equipment, using power electronics and software to actively manage electricity flows, whereas traditional transformers are largely passive devices designed to change voltage.
This new funding will allow Heron to build a U.S.manufacturing facility designed to produce around 40 gigawatts of transformer equipment annually; it expects to begin production there next year. This latest raise follows quickly on the heels of its $38 million Series A round last May, reflecting hunger among customers for more efficient and quicker to deploy grid infrastructure solutions. Early announced customers include the clean energy developer Intersect Power and the data center developer Crusoe.
It’s a good time to be a transformer startup. DG Matrix, which also develops solid-state transformers, closed a $60 million Series A this week, led by Engine Ventures. The company plans to use the funding to scale its manufacturing and supply chain as it looks to supply data centers with its power-conversion systems.
Solid-state transformers — which use semiconductors to convert and control electricity — have been in the research and development phase for decades. Now they’re finally reaching the stage of technical maturity needed for commercial deployment, driving a surge in activity across the industry. DG Matrix’s emphasis is on creating flexible power conversion solutions, marketing its product as the world’s first “multi-port” solid-state transformer capable of managing and balancing electricity from multiple different sources at once.
“This Series A marks our transition from breakthrough technology to scaled infrastructure deployment,” Haroon Inam, DG Matrix’s CEO, said in a statement. “We are working with hyperscalers, energy companies, and industrial customers across North America and globally, with multiple gigawatt-class datacenters in the pipeline.” According to TechCrunch, data centers make up roughly 90% of DG Matrix’s current customer base, as its transformers can significantly reduce the space data centers require for power conversion.
Zero Homes, a digital platform and marketplace that helps homeowners manage the heat pump installation process, just announced a $16.8 million Series A round led by climate tech investor Prelude Ventures. The company’s free smartphone app lets customers create a “digital twin” of their home — a virtual model that mirrors the real-world version, built from photos, videos, and utility data. This allows homeowners to get quotes, purchase, and plan for their HVAC upgrade without the need for a traditional in-person inspection. The company says this will cut overall project costs by 20% on average.
Zero works with a network of vetted independent installers across the U.S., with active projects in California, Colorado, Massachusetts, Minnesota, and Illinois. As the startup plans for national expansion, it’s already gained traction with some local governments, partnering with Chicago on its Green Homes initiative and netting $745,000 from Colorado’s Office of Economic Development to grow its operations in Denver.
Climactic, an early-stage climate tech VC, launched a new hybrid fund called Material Scale, aimed at helping sustainable materials and apparel startups navigate the so-called “valley of death” — the gap between early-stage funding and the later-stage capital needed to commercialize. As Climactic’s cofounder Josh Fesler explained on LinkedIn, the fund is designed to cover the extra costs involved with sustainable production, bridging the gap between the market price of conventional materials and the higher price of sustainable materials.
Structured as a “hybrid debt-equity platform,” the fund allows Climactic’s investors to either take a traditional equity stake in materials startups or provide them with capital in the form of loans. TechCrunch reports that the fund’s initial investments will come from an $11 million special purpose vehicle, a separate entity created to fund a small set of initial investments that sits outside Material Scale’s main investing pool.
The fashion industry accounts for roughly 10% of global emissions. “These days there are many alt materials startups that have moved through science and structural risk, have venture funding, credible supply chains and most importantly can achieve market price and positive gross margins just with scale,” Fesler wrote in his LinkedIn post. “They just need the capital to grow into their rightful commercial place.”
Clean energy stocks were up after the court ruled that the president lacked legal authority to impose the trade barriers.
The Supreme Court struck down several of Donald Trump’s tariffs — the “fentanyl” tariffs on Canada, Mexico, and China and the worldwide “reciprocal” tariffs ostensibly designed to cure the trade deficit — on Friday morning, ruling that they are illegal under the International Emergency Economic Powers Act.
The actual details of refunding tariffs will have to be addressed by lower courts. Meanwhile, the White House has previewed plans to quickly reimpose tariffs under other, better-established authorities.
The tariffs have weighed heavily on clean energy manufacturers, with several companies’ share prices falling dramatically in the wake of the initial announcements in April and tariff discussion dominating subsequent earnings calls. Now there’s been a sigh of relief, although many analysts expected the Court to be extremely skeptical of the Trump administration’s legal arguments for the tariffs.
The iShares Global Clean Energy ETF was up almost 1%, and shares in the solar manufacturer First Solar and the inverter company Enphase were up over 5% and 3%, respectively.
First Solar initially seemed like a winner of the trade barriers, however the company said during its first quarter earnings call last year that the high tariff rate and uncertainty about future policy negatively affected investments it had made in Asia for the U.S. market. Enphase, the inverter and battery company, reported that its gross margins included five percentage points of negative impact from reciprocal tariffs.
Trump unveiled the reciprocal tariffs on April 2, a.k.a. “liberation day,” and they have dominated decisionmaking and investor sentiment for clean energy companies. Despite extensive efforts to build an American supply chain, many U.S. clean energy companies — especially if they deal with batteries or solar — are still often dependent on imports, especially from Asia and specifically China.
In an April earnings call, Tesla’s chief financial officer said that the impact of tariffs on the company’s energy business would be “outsized.” The turbine manufacturer GE Vernova predicted hundreds of millions of dollars of new costs.
Companies scrambled and accelerated their efforts to source products and supplies from the United States, or at least anywhere other than China.
Even though the tariffs were quickly dialed back following a brutal market reaction, costs that were still being felt through the end of last year. Tesla said during its January earnings call that it expected margins to shrink in its energy business due to “policy uncertainty” and the “cost of tariffs.”
Current conditions: More than a foot of snow is blanketing the California mountains • With thousands already displaced by flooding, Papua New Guinea is facing more days of thunderstorms ahead • It’s snowing in Ulaanbaatar today, and temperatures in the Mongolian capital will plunge from 31 degrees Fahrenheit to as low as 2 degrees by Sunday.
We all know the truisms of market logic 101. Precious metals surge when political volatility threatens economic instability. Gun stocks pop when a mass shooting stirs calls for firearm restrictions. And — as anyone who’s been paying attention to the world over the past year knows — oil prices spike when war with Iran looks imminent. Sure enough, the price of crude hit a six-month high Wednesday before inching upward still on Thursday after President Donald Trump publicly gave Tehran 10 to 15 days to agree to a peace deal or face “bad things.” Despite the largest U.S. troop buildup in the Middle East since 2003, the American military action won’t feature a ground invasion, said Gregory Brew, the Eurasia Group analyst who tracks Iran and energy issues. “It will be air strikes, possibly commando raids,” he wrote Thursday in a series of posts on X. Comparisons to Iraq “miss the mark,” he said, because whatever Trump does will likely wrap up in days. The bigger issue is that the conflict likely won’t resolve any of the issues that make Iran such a flashpoint. “There will be no deal, the regime will still be there, the missile and nuclear programs will remain and will be slowly rebuilt,” Brew wrote. “In six months, we could be back in the same situation.”
California, Colorado, and Washington led 10 other states in suing the Trump administration this week over the Department of Energy’s termination of billions in federal funding for clean energy and infrastructure projects. In a lawsuit filed in federal court in San Francisco, the states accuse the agency of using a “nebulous and opaque” review process to justify slashing billions in funding that was already awarded. “These aren’t optional programs — these are investments approved by bipartisan majorities in Congress,” California Attorney General Rob Bonta said at a press conference announcing the lawsuit, according to Courthouse News Service. “The president doesn’t get to cancel them simply because he disagrees with them. California won’t allow President Trump and his administration to play politics with our economy, our energy grid and our jobs.”
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If you’re looking for a sign of the coming geothermal energy boom in the U.S., consider this: There is now a double-digit number of next-generation projects underway, according to an overview the Energy Information Administration published Thursday. For the past century, geothermal energy has relied upon finding and tapping into suitably hot underground reservoirs of water. But a new generation of “enhanced” geothermal companies is using modern drilling techniques to harness heat from dry rocks.

If you’re looking for a thorough overview of the technology, Heatmap’s Matthew Zeitlin wrote the definitive 101 explainer here. But a few represent some of the earliest experiments in enhanced geothermal, including the Fenton Hill in New Mexico, established in the 1970s, which was the world’s first successful project to use the technology.
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When Exxon Mobil announced plans in December to scale back its spending on low-carbon investments, the oil giant justified the move in part on all the carbon capture and storage projects poised to come online this year that would vault the company ahead of its rivals. This week, Exxon Mobil started transporting and storing captured carbon dioxide at its latest facility in Louisiana. The New Generation Gas Gathering facility on the western edge of the state’s Gulf Coast is the company’s second CCS project in Louisiana. Known as NG3, the project is set to remove 1.2 million tons of CO2 per year from gas streams headed to export markets on the coast. The Carbon Herald reported that two additional CCS projects are set to start up operations this year.
CCS got a big boost in October when Google agreed to back construction of a gas-fired power plant built with carbon capture tech from the ground up. The plant, which Matthew noted at the time would be the first of its kind at a commercial scale, is sited near a well where captured carbon can be injected. Senate Democrats, meanwhile, are reportedly probing the Trump administration’s decision to redirect CCS funding to coal plants.
In 2019, Maine expanded its Net Energy Billing program to subsidize construction of commercial-scale solar farms across the state. “And it worked,” Maine Public Radio reported last July when the state passed a law to phase out the funding, “too well, some argue.” In 2025 alone, ratepayers in the state were on the hook for $234 million to support the program. Solar companies sued, arguing that the abrupt cut to state support had unfairly deprived them of funding. But this week U.S. District Judge Stacey Neumann denied a motion the owners of dozens of solar farms filed requesting an injunction.
That isn’t to say things aren’t looking sunny for solar in Maine. On the contrary, just yesterday the developer Swift Current Energy secured $248 million in project financing for a 122-megawatt solar farm and the Poland Spring water company went on statewide TV to show off the new panels on its bottling plant. The federal outlook isn’t as bright at the moment. As Heatmap’s Jael Holzman reported in December, the solar industry was begging Congress for help to end the Trump administration’s permitting blockade on new projects on federal lands.
The Trump-stumping country music star John Rich is continuing his crusade against the Tennessee Valley Authority. Months after blocking construction of a gas plant in his neighborhood, Rich personally pressed TVA CEO Don Moul to reroute a transmission line, posting a video Thursday of farmers who opposed the federal utility’s use of the right of way process to push through the project. Rich said Moul “personally told me as of this morning” TVA will put the effort on hold. The left-wing energy writer and Heatmap contributor Fred Stafford summed it up this way on X: “MAGA NIMBY rises, Dark Abundance falls. TVA ratepayers will be paying more for a rerouted transmission project because this country music star threw his support behind a local farmer who refuses to allow the transmission line to cross his land.”