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AM Briefing

U.S. Solar Installation Just Inched Past Last Year’s Tally

On MARVEL’s market, a climate retraction, and Eavor’s geothermal milestone

Solar panel installation.
Heatmap Illustration/Getty Images

Current conditions: A nor’easter dumping as much as a foot of snow on parts of the Upper Midwest is set to dust New York City on its way to deliver heavier snow to northern New England • Temperatures nearly topped 90 degrees Fahrenheit in Charlotte Amalie, U.S. Virgin Islands, as America’s third-most populous overseas territory endures a record December heatwave • South Australia, Victoria, and Tasmania are all under severe fire warnings.

THE TOP FIVE

1. U.S. solar installations in 2025 set to beat previous year

It was the best of times, it was the worst of times, it was the age of smashing solar installation records, it was the age of phasing out the federal tax credits that so successfully spurred the boom in the first place. The United States added 2 gigawatts of utility-scale solar in September, bringing the total installed this year to 21 gigawatts. That, as Utility Dive noted of newly released Federal Energy Regulatory Commission data, is slightly above the 20 gigawatts installed in the same period last year. Of the 28 gigawatts of new generation the U.S. installed so far in 2025, 75% was solar, followed by wind at 13% and gas at 11%. Still, natural gas makes up the largest share of the U.S. grid’s electricity capacity, with 42% compared to the combined 31% that wind, solar, and hydro comprise. And the picture isn’t getting better. As Heatmap’s Jael Holzman wrote yesterday, the solar industry is “begging Congress for help with Trump.”

2. Idaho National Lab picks corporate partners for the government’s MARVEL microreactor

A cutaway of the MARVEL reactor, showing its size relative to a person. Idaho National Laboratory

For the past four years, the Department of Energy has been developing its very own microreactor. The Microreactor Application Research Validation and Evaluation, or MARVEL, is a 10-kilowatt, liquid-metal cooled microreactor currently under construction at the Idaho National Laboratory. On Thursday, the lab unveiled the “first potential end users for MARVEL,” including Amazon Web Services, energy equipment giant GE Vernova, oil giant ConocoPhillips, and the data center operator DCX. “With access to MARVEL, companies can explore how microreactors will potentially help us win the global AI race, solve water challenges, and so much more,” John Jackson, national technical director for the microreactor program at the Energy Department’s Office of Nuclear Energy, told Power magazine. “The MARVEL testbed exemplifies how nuclear energy can open the door to a stronger, safer and more prosperous future for our country.”

It’s part of the strides the Trump administration has taken on nuclear power recently. Earlier this week, as I wrote here, the Energy Department awarded $400 million each to two small modular reactor projects aiming to build the first lower-powered versions of third-generation units based on the light water reactors already in operation today. Last month, as I covered in this newsletter, the agency put up a $1 billion loan to fund the restart of the working reactor at the Pennsylvania plant once known as Three Mile Island. There is, after all, what Heatmap’s Katie Brigham called a very “real” nuclear dealmaking boom afoot.

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  • 3. Top journal retracts landmark study warming of climate catastrophe

    The prestigious journal Nature has retracted a study published last year that concluded that climate change would cause a catastrophic drop in economic output of 62% by the end of the century, a jarring finding taken so seriously that central banks worked the warning into risk-assessment models. But a team of economists noticed an error in data from Uzbekistan. Excluding the Central Asian republic from the calculation pegged the predicted plunge in economic activity at 23%. That doesn’t mean climate change isn’t an economic threat, as the papers detractors noted to The New York Times. “Most people for the last decade have thought that a 20% reduction in 2100 was an insanely large number,” said Solomon Hsiang, a professor of global environmental policy at Stanford University who in August co-wrote the critique of the original study. “So the fact that this paper is coming out saying 60% is off the chart.”

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  • 4. Data centers could spur 600,000 jobs in home energy upgrades

    The advocacy group Rewiring America is out with an interesting new thought experiment on the potential benefits of making the country’s households more energy efficient as a means of clearing space on the grid for data centers. Upgrading U.S. houses, condos, and apartments with efficient appliances, solar panels, and batteries could create enough capacity to meet the rising electricity demand of large data centers over the next five years. Doing so would create more than 600,000 jobs for carpenters, electricians, and others involved in the supply chain. Virtual power plants — software systems that allow utilities to pay homeowners for the right to tap into rooftop solar panels, batteries, plugged-in electric vehicles, and smart thermostats to balance the grid — are, advocates say, emerging as a potential source of large-scale power that can be harnessed in the next few years, a timescale relevant to many data center projects that are expected to complete construction before new power plants can come online.

    5. Eavor’s next-generation geothermal plant enters into commercial operation

    Back in October, I told you the next-generation geothermal startup Eavor was on the brink of completing its first power plant south of Munich, Germany. Now the Calgary-based company has entered into commercial operation. Eavor officially delivered its first electrons to the German grid from its facility in Geretsried. Eavor hailed the milestone as proof not just of its potential to operate a generating plant but a victory for its in-house drilling technology designed to carve a closed-loop well deep underground. “With Geretsried now on-stream, we’re more confident than ever that our closed-loop geothermal system, designed for adaptability and suited to the world’s diverse regions, will secure its place as the leading solution for commercial geothermal application,” CEO Mark Fitzgerald said in a statement. It’s not the only geothermal startup making waves. As I wrote in yesterday’s newsletter, Zanskar, the Salt Lake City-based company using artificial intelligence to find new conventional geothermal resources, just claimed one of the biggest discoveries in the U.S. in more than 30 years.


    THE KICKER

    You may also recall another newsletter from October where I told you that all Trump’s nominees to serve on the board of the Tennessee Valley Authority vowed to stand against privatizing the federally-owned utility, easing fears that the president’s recent boardroom meddling wasn’t an attempt at selling off the power provider on which more than 10 million Americans depend for cheap electricity. If you agree with analyses showing public ownership as the best way to keep prices down, then I have good news for you. When businessman and Republican megadonor Lee Beaman came before the Senate for a confirmation Wednesday, the nominee for the board said his preference for private enterprise came with an exception for the TVA. “Although I generally believe that the private sector is more efficient than government, in the case of TVA, I think TVA is more uniquely, appropriately operated as a government entity,” Beaman told the Senate Environment and Public Works Committee, per E&E News.

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    Hotspots

    GOP Lawmaker Asks FAA to Rescind Wind Farm Approval

    And more on the week’s biggest fights around renewable energy.

    The United States.
    Heatmap Illustration/Getty Images

    1. Benton County, Washington – The Horse Heaven wind farm in Washington State could become the next Lava Ridge — if the Federal Aviation Administration wants to take up the cause.

    • On Monday, Dan Newhouse, Republican congressman of Washington, sent a letter to the FAA asking them to review previous approvals for Horse Heaven, claiming that the project’s development would significantly impede upon air traffic into the third largest airport in the state, which he said is located ten miles from the project site. To make this claim Newhouse relied entirely on the height of the turbines. He did not reference any specific study finding issues.
    • There’s a wee bit of irony here: Horse Heaven – a project proposed by Scout Clean Energy – first set up an agreement to avoid air navigation issues under the first Trump administration. Nevertheless, Newhouse asked the agency to revisit the determination. “There remains a great deal of concern about its impact on safe and reliable air operations,” he wrote. “I believe a rigorous re-examination of the prior determination of no hazard is essential to properly and accurately assess this project’s impact on the community.”
    • The “concern” Newhouse is referencing: a letter sent from residents in his district in eastern Washington whose fight against Horse Heaven I previously chronicled a full year ago for The Fight. In a letter to the FAA in September, which Newhouse endorsed, these residents wrote there were flaws under the first agreement for Horse Heaven that failed to take into account the full height of the turbines.
    • I was first to chronicle the risk of the FAA grounding wind project development at the beginning of the Trump administration. If this cause is taken up by the agency I do believe it will send chills down the spines of other project developers because, up until now, the agency has not been weaponized against the wind industry like the Interior Department or other vectors of the Transportation Department (the FAA is under their purview).
    • When asked for comment, FAA spokesman Steven Kulm told me: “We will respond to the Congressman directly.” Kulm did not respond to an additional request for comment on whether the agency agreed with the claims about Horse Heaven impacting air traffic.

    2. Dukes County, Massachusetts – The Trump administration signaled this week it will rescind the approvals for the New England 1 offshore wind project.

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    Q&A

    How Rep. Sean Casten Is Thinking of Permitting Reform

    A conversation with the co-chair of the House Sustainable Energy and Environment Coalition

    Rep. Sean Casten.
    Heatmap Illustration

    This week’s conversation is with Rep. Sean Casten, co-chair of the House Sustainable Energy and Environment Coalition – a group of climate hawkish Democratic lawmakers in the U.S. House of Representatives. Casten and another lawmaker, Rep. Mike Levin, recently released the coalition’s priority permitting reform package known as the Cheap Energy Act, which stands in stark contrast to many of the permitting ideas gaining Republican support in Congress today. I reached out to talk about the state of play on permitting, where renewables projects fit on Democrats’ priority list in bipartisan talks, and whether lawmakers will ever address the major barrier we talk about every week here in The Fight: local control. Our chat wound up immensely informative and this is maybe my favorite Q&A I’ve had the liberty to write so far in this newsletter’s history.

    The following conversation was lightly edited for clarity.

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    Spotlight

    How to Build a Wind Farm in Trump’s America

    A renewables project runs into trouble — and wins.

    North Dakota and wind turbines.
    Heatmap Illustration/Getty Images

    It turns out that in order to get a wind farm approved in Trump’s America, you have to treat the project like a local election. One developer working in North Dakota showed the blueprint.

    Earlier this year, we chronicled the Longspur wind project, a 200-megawatt project in North Dakota that would primarily feed energy west to Minnesota. In Morton County where it would be built, local zoning officials seemed prepared to reject the project – a significant turn given the region’s history of supporting wind energy development. Based on testimony at the zoning hearing about Longspur, it was clear this was because there’s already lots of turbines spinning in Morton County and there was a danger of oversaturation that could tip one of the few friendly places for wind power against its growth. Longspur is backed by Allete, a subsidiary of Minnesota Power, and is supposed to help the utility meet its decarbonization targets.

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