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A year and a half ago, President Biden signed the Inflation Reduction Act, the biggest climate law in American history — and arguably in world history. The law will spend an estimated $500 billion in grants and tax credits to incentivize people and businesses to switch from burning fossil fuels to using cleaner, zero-carbon technologies.
That’s the goal, at least. But is the IRA actually working? Now, 18 months after its passage, we’re starting to be able to answer that question. A new report from a coalition of major energy analysts — including MIT, the Rhodium Group, and our cohost Jesse Jenkins’ lab at Princeton — looks at data from the power and transportation sectors and concludes that yes, the law is starting to decarbonize the American economy.
But it isn’t working in the way many people might expect, because while electric vehicles are on track to meet the IRA’s climate goals, the power sector is not.
That’s the opposite of what you might think from reading the popular press, which has bemoaned an alleged slowdown in new EV sales. But the new report finds that the transportation sector actually came in at the upper end of what modelers expected to see this year. About 9.2% of new cars sold last year in the United States were zero-emissions vehicles; after the IRA passed, modelers had expected EVs to come in anywhere from 8.1 to 9.4% of sales.
But the power sector is lagging behind what modelers had expected to see. While the three groups had projected that 46 to 79 gigawatts of new zero-carbon power would come online last year, only 32.3 gigawatts of new capacity actually did. That is primarily due to a drop in new onshore wind projects, which fell below the installation levels achieved in 2020 and 2021. While solar and batteries continued to go gangbusters, exceeding previous records, they could not make up for the drop in wind. That means that the power sector is not on track to cut emissions 40% by 2030, as compared to 2005 levels, as the bill’s supporters have hoped.
Jesse Jenkins, an energy systems expert and professor at Princeton University, and I dive into the details on the latest episode of Shift Key.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
You can also add the show’s RSS feed to your podcast app to follow us directly.
Here is an excerpt from our conversation:
Robinson Meyer: First, let's do the moment of truth. Let’s just first get into the data. So in the power sector, what do we see?
Jesse Jenkins: What we see in the electricity sector is a new record set for zero carbon electricity generation and storage capacity additions. So that's new power plant and battery storage construction.
In aggregate, we saw over 32,000 megawatts or 32 gigawatts of new zero carbon generation and storage added to the U.S. grid in 2023. That's about a 32% increase from the rate in 2022. And it edges out a previous record that we saw in 2021 of about 31.6 gigawatts. So good news is we're setting new record growth rates in total in terms of wind and solar and battery additions.
Unfortunately, that does fall on the lower end of what we were projecting in most of the modeling results. We were looking for, on average, about 46 to 79 gigawatts, so call it 40 to 80 gigawatts on average of additions in 2023 and 2024. We fell short of the low end of that range at 32.3 gigawatts. So unless the pace accelerates substantially in 2024, we're probably going to fall a bit behind schedule in terms of capacity additions.
Meyer: And do we have a sense of what's driving that? Because I think that's a very surprising finding, that we're behind schedule in the power sector, where I think people feel pretty good generally about the pace of decarbonization. Or I think where the common wisdom, at least, is that the pace of decarbonization is like proceeding apace. What's driving this underperformance of the model?
Jenkins: So it's really the difference between solar and wind additions.
The solar sector added about 18.4 gigawatts of capacity in 2023. That's up massively from just about 11 gigawatts in 2022. It's about double what we had seen in 2020, which was kind of our reference when we were doing our modeling as we started the REPEAT project in 2021. And so that's looking encouraging and in fact is running ahead of schedule with the average pace of additions that we saw in REPEAT project results.
Batteries are growing way faster than we expected.
And that helps really make the most of those solar capacity additions because solar and batteries are kind of like peanut butter and jelly, they go together quite well. And that's because solar has this nice, regular daily fluctuation, right? From the sun rising and setting. And that pairs really well with batteries, which today in a way lithium ion batteries are best suited for, you know, only a few hours of storage. So they'll charge for three or four hours in the middle of the day when we've got an abundance of sun. And then they'll discharge in the evening to help meet the evening peak of demand when everybody's coming home from work.
The batteries basically helped shift the solar output from the middle of the day to hit that evening peak. And that's, that's really helpful. Where things are running behind schedule is really in the wind sector, where we only built about half of the peak rate, actually less than half that we've seen historically in 2023. Additions of wind power in 2023 were only about 6.3 gigawatts, and that's down from nearly 15 gigawatts in each of 2020 and 2021.
So that's a step backwards at a time when we should be smashing new record growth rates across all of these sectors. And that's giving me the biggest concern as we look at in the next couple of years.
Meyer: And that's, I mean, last show we talked about offshore wind and the troubles in offshore wind and how it seems like some big offshore wind projects that we thought might be coming online in the middle of this decade might not be coming online till the end of the decade. But when we talk about wind underperforming in terms of the whole country over the past year, we're really still talking about onshore wind. This is like big turbines in the middle of the Great Plains, not big turbines off the coast of New York, New Jersey, right?
Jenkins: That's right. Yeah, I think I don't think we had any significant offshore wind capacity additions coming in 2024. You know, most of that we were expecting would come in between 2026 and 2030 or 2035. So this is really a story about onshore wind, where if we look at the economics of onshore wind across the country, there's a tremendous number of sites that look very economic given the incentives provided by the Inflation Reduction Act.
And unfortunately, we're just not building out at the pace that would be economically justified. And that is really an indicator that there are a substantial number of other non-economic frictions or barriers to deployment of wind in particular at the pace that we want to see.
The full transcript is here.
This episode of Shift Key is sponsored by Advanced Energy United, KORE Power, and Yale …
Advanced Energy United educates, engages, and advocates for policies that allow our member companies to compete to power our economy with 100% clean energy, working with decision makers and energy market regulators to achieve this goal. Together, we are united in our mission to accelerate the transition to 100% clean energy in America. Learn more at advancedenergyunited.org/heatmap
KORE Power provides the commercial, industrial, and utility markets with functional solutions that advance the clean energy transition worldwide. KORE Power's technology and manufacturing capabilities provide direct access to next generation battery cells, energy storage systems that scale to grid+, EV power & infrastructure, and intuitive asset management to unlock energy strategies across a myriad of applications. Explore more at korepower.com — the future of clean energy is here.
Build your skills in policy, finance, and clean technology at Yale. Yale’s Financing and Deploying Clean Energy certificate program is a 10-month online certificate program that trains and connects clean energy professionals to catalyze an equitable transition to a clean economy. Connect with Yale’s expertise, grow your professional network, and deepen your impact. Learn more at cbey.yale.edu/certificate.
Music for Shift Key is by Adam Kromelow.
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With construction deadlines approaching, developers still aren’t sure how to comply with the new rules.
Certainty, certainty, certainty — three things that are of paramount importance for anyone making an investment decision. There’s little of it to be found in the renewable energy business these days.
The main vectors of uncertainty are obvious enough — whipsawing trade policy, protean administrative hostility toward wind, a long-awaited summit with China that appears to have done nothing to resolve the war with Iran. But there’s still one big “known unknown” — rules governing how companies are allowed to interact with “prohibited foreign entities,” which remain unwritten nearly a year after the One Big Beautiful Bill Act slapped them on just about every remaining clean energy tax credit.
The list of countries that qualify as “foreign entities of concern” is short, including Russian, Iran, North Korea, and China. Post-OBBBA, a firm may be treated as a “foreign-influenced entity” if at least 15% of its debt is issued by one of these countries — though in reality, China is the only one that matters. This rule also kicks in when there’s foreign entity authority to appoint executive officers, 25% or greater ownership by a single entity or a combined ownership of at least 40%.
Any company that wants to claim a clean energy tax credit must comply with the FEOC rules. How to calculate those percentages, however, the Trump administration has so far failed to say. This is tricky because clean energy projects seeking tax credits must be placed in service by the end of 2027 or start construction by July 4 of this year, which doesn’t leave them much time left to align themselves with the new rules.
While the Treasury Department published preliminary guidance in February, it largely covered “material assistance,” the system for determining how much of the cost of the project comes from inputs that are linked to those four nations (again, this is really about China). That still leaves the issue of foreign influence and “effective control,” i.e. who is allowed to own or invest in a project and what that means.
This has meant a lot of work for tax lawyers, Heather Cooper, a partner at McDermott Will & Schulte, told me on Friday.
“The FEOC ownership rules are an all or nothing proposition,” she said. “You have to satisfy these rules. It’s not optional. It’s not a matter of you lose some of the credits, but you keep others. There’s no remedy or anything. This is all or nothing.”
That uncertainty has had a chilling effect on the market. In February, Bloomberg reported that Morgan Stanley and JPMorgan had frozen some of their renewables financing work because of uncertainty around these rules, though Cooper told me the market has since thawed somewhat.
“More parties are getting comfortable enough that there are reasonable interpretations of these rules that they can move forward,” she said. “The reality is that, for folks in this industry — not just developers, but investors, tax insurers, and others — their business mandate is they need to be doing these projects.”
Some of the most frequent complaints from advisors and trade groups come around just how deep into a project’s investors you have to look to find undue foreign ownership or investment.
This gets complicated when it comes to the structures involved with clean energy projects that claim tax credits. They often combine developers (who have their own investors), outside investment funds, banks, and large companies that buy the tax credits on the transferability market.
These companies — especially the banks, which fund themselves with debt — “don’t know on any particular date how much of their debt is held by Chinese connected lenders, and therefore they’re not sure how the rules apply, and that’s caused a couple of banks to pull out of the tax equity market,” David Burton, a partner at Norton Rose Fulbright, told me. “It seems pretty crazy that a large international bank that has its debt trading is going to be a specified foreign entity because on some date, a Chinese party decided to take a large position in its debt.”
For those still participating in the market, the lack of guidance on debt and equity provisions has meant that lawyers are having to ascend the ladder of entities involved in a project, from private equity firms who aren’t typically used to disclosing their limited partners to developers, banks, and public companies that buy the tax credits.
“We’re having to go to private equity funds and say, hey, how many of your LPs are Chinese?” David Burton, a partner at Norton Rose Fulbright, told me. This is not information these funds are typically particularly eager to share. If a lawyer “had asked a private equity firm please tell us about your LPs, before One Big Beautiful Bill, they probably would have told us to go jump in the lake,” Burton said.
Still, the deals are still happening, but “the legal fees are more expensive. The underwriting and due diligence time is longer, there are more headaches,” he told me.
Typically these deals involve joint ventures that formed for that specific deal, which can then transfer the tax credits to another entity with more tax liability to offset. The joint venture might be majority owned by a public company, with a large minority position held by a private equity fund, Burton said.
For the public company, Burton said, his team has to ask “Are any of your shareholders large enough that they have to be disclosed to the SEC? Are any of those Chinese?” For the private equity fund, they have to ask where its investors are residents and what countries they’re citizens of. While private equity funds can be “relatively cooperative,” the process is still a “headache.”
“It took time to figure out how to write these certifications and get me comfortable with the certification, my client comfortable with it, the private equity firm comfortable with it, the tax credit buyer comfortable with it,” he told me, referring to the written legal explanation for how companies involved are complying with what their lawyers think the tax rules are.
Players such as the American Council on Renewable Energy hope that guidance will cut down on this certification time by limiting the universe of entities that will have to scrub their rolls of Chinese investors or corporate officers.
“It’d be nice if we knew you only have to apply the test at the entity that’s considered the tax owner of the project,” i.e. just the joint venture that’s formed for a specific project, Cooper told me.
“There’s a pretty reasonable and plain reading of the statute that limits the term ’taxpayer’ to the entity that owns the project when it’s placed in service,” Cooper said.
Many in the industry expect more guidance on the rules by the end of year, though as Burton noted, “this Treasury is hard to predict.”
In the meantime, expect even more work for tax lawyers.
“We’re used to December being super busy,” Burton said. “But it now feels like every month since the One Big Beautiful Bill passed is like December, so we’ve had, like, you know, eight Decembers in a row.”
Deep cuts to the department have left each staffer with a huge amount of money to manage.
The Department of Energy has an enviable problem: It has more money than it can spend.
DOE disbursed just 2% of its total budgetary resources in fiscal year 2025, according to a report released earlier this year from the EFI Foundation, a nonprofit that tracks innovations in energy. That figure is far lower than the 38% of funds it distributed the year prior.
While some of that is due to political whiplash in Washington, there is another, far more mundane cause: There simply aren’t that many people left to oversee the money. Thanks to the Department of Government Efficiency’s efforts, one in five DOE staff members left the agency. On top of that, Energy Secretary Chris Wright shuffled around and combined offices in a Kafkaesque restructuring. Short on workers and clear direction, the department appears unable to churn through its sizable budget.

Though Congress provides budgetary authority, agencies are left to allot spending for the programs under their ambit, and then obligate payments through contracts, grants, and loans. While departments are expected to use the money they’re allocated, federal staff have to work through the gritty details of each individual transaction.
As a result of its reduced headcount, DOE’s employees are each responsible for far more budgetary resources than ever before.
“DOE is facing its largest imbalance in its history,” Alex Kizer, executive vice president of EFI Foundation, told me. In fiscal year 2017, DOE budgeted around $4.7 million per full-time employee. In the fiscal year 2026 budget request, that figure reached $35.7 million per worker — about eight times more.
Part of that increase is the result of the unprecedented injection of funding into DOE from the 2021 Infrastructure Investment and Jobs Act and the 2022 Inflation Reduction Act. The pair of laws, which gave DOE access to $97 billion, comprised the United States’ largest investment to combat climate change in the nation’s history.
The epoch of federally backed renewable energy investment proved to be short-lived, however. Once President Trump retook office last year, his administration froze funds and initiated a purge of federal workers that resulted in 3,000 staffers (about one in five) leaving DOE through the Deferred Resignation Program. The administration canceled hundreds of projects, evaporating $23 billion in federal support.
While the One Big Beautiful Bill Act passed last summer depleted some of the IRA’s coffers and sunsetted many tax credits years early, it only rescinded about $1.8 billion from DOE, according to the EFI Foundation. Much of the IRA’s spending had already gone out the door or was left intact.
This leaves DOE in a strange position: Its budget is historically high, but its staffing levels have suffered an unprecedented drop.

Even before the short-lived Elon Musk-run agency took a chainsaw to the federal workforce, DOE struggled to hire enough people to keep up with the pace of funding demanded by the IRA’s funding deadlines. The Loan Programs Office, for example, was criticized for moving too slowly in shelling out its hundreds of billions in loan authority. According to a report from three ex-DOE staffers that Heatmap’s Emily Pontecorvo covered, the IRA’s implementation suffered from a lack of “highly skilled, highly talented staff” to carry out its many programs.
“The last year’s uncertainty and the staff cuts, the project cancellations, those increase an already tightening bottleneck of difficulty with implementation at the department,” Sarah Frances Smith, EFI Foundation’s deputy director, told me.
One former longtime Department of Energy staffer who asked not to be named because they may want to return one day told me that as soon as Trump’s second term started, funding disbursement slowed to a halt. Employees had to get permission from leadership just to pay invoices for projects that had already been granted funding, the ex-DOE worker said.
While the Trump administration quickly moved to hamstring renewable energy resources, staff were kept busy complying with executive orders such as removing any mention of diversity equity and inclusion from government websites and responding to automated “What did you do last week?” emails.
On top of government funding drying up, Kizer told me that the confusion surrounding DOE has had a “cooling effect on the private sector’s appetite to do business with DOE,” though the size of that effect is “hard to quantify.”
Under President Biden, DOE put a lot of effort into building trust with companies doing work critical to its renewable energy priorities. Now, states and companies alike are suing DOE to restore revoked funds. In a recent report, the Government Accountability Office warned, “Private companies, which are often funding more than 50 percent of these projects, may reconsider future partnerships with the federal government.”
Clean energy firms aren’t the only ones upset by DOE’s about-face. Even the Republican-controlled Congress balked at President Trump’s proposed deep cuts to DOE’s budget in its latest round of budget negotiations. Appropriations for fiscal year 2026 will be just slightly lower than the year before — though without additional headcount to manage it, the same difficulties getting money out the door will remain.
The widespread staff exit also appears to have slowed work supporting the administration’s new priorities, namely coal and critical minerals. LPO, which was rebranded the “Office of Energy Dominance Financing,” has announced only a few new loans since President Biden left office. Southern Company, which received the Office’s largest-ever loan, was previously backed by a loan to its subsidiary Georgia Power under the first Trump administration.
Despite Trump’s frequent invocation of the importance of coal, DOE hasn’t accomplished much for the technology besides some funding to keep open a handful of struggling coal plants and a loan to restart a coal gasification plant for fertilizer production that was already in LPO’s pipeline under Biden.
Even if DOE wanted to become an oil and gas-enabling juggernaut, it may not have the labor force it needs to carry out a carbon-heavy energy mandate.
“When you cut as many people as they did, you have to figure out who’s going to do the stuff that those people were doing,” said the ex-DOE staffer. “And now they’re going to move and going, Oh crap, we fired that guy.”
Will moving fast and breaking air permits exacerbate tensions with locals?
The Trump administration is trying to ease data centers’ power permitting burden. It’s likely to speed things up. Whether it’ll kick up more dust for the industry is literally up in the air.
On Tuesday, the EPA proposed a rule change that would let developers of all stripes start certain kinds of construction before getting a historically necessary permit under the Clean Air Act. Right now this document known as a New Source Review has long been required before you can start building anything that will release significant levels of air pollutants – from factories to natural gas plants. If EPA finalizes this rule, it will mean companies can do lots of work before the actual emitting object (say, a gas turbine) is installed, down to pouring concrete for cement pads.
The EPA’s rule change itself doesn’t mention AI data centers. However, the impetus was apparent in press materials as the agency cited President Trump’s executive order to cut red tape around the sector. Industry attorneys and environmental litigants alike told me this change will do just that, cutting months to years from project construction timelines, and put pressure on state regulators to issue air permits by allowing serious construction to start that officials are usually reluctant to disrupt.
“I think the intended result is also what will happen. Developers will be able to move more quickly, without additional delay,” said Jeff Holmstead, a D.C.-based attorney with Bracewell who served as EPA assistant administrator for air and radiation under George H.W. Bush. “It will almost certainly save some time for permitting and construction of new infrastructure.”
Air permitting is often a snag that will hold up a major construction project. Doubly so for gas-powered generation. Before this proposal, the EPA historically was wary to let companies invest in what any layperson would consider actual construction work. The race for more AI infrastructure has changed the game, supercharging what was already an active debate over energy needs and our nation’s decades-old environmental laws.
Many environmental groups condemned the proposal upon its release, stating it would make gas-powered AI data centers more popular and diminish risks currently in place for using dirtier forms of electricity. Normally, they argue, this permitting process would give state and federal officials an early opportunity to gauge whether pollution control measures make sense and if a developer’s preferred design would unduly harm the surrounding community. This could include encouraging developers to consider alternate energy sources.
“Inevitably agencies have flexibility as to how much they ask, and what this allows them to do is pre-commit in ways that’ll force agencies to take stuff off the table. What’s taken off the table, it’s hard to know, but you’re constraining options to respond to public concerns or recognize air quality impacts,” said Sanjay Narayan, Sierra Club’s chief appellate counsel.
Herein lies the dilemma: will regulatory speed for power sacrifice opportunities for input that could quell local concerns?
We’re seeing this dilemma play out in real time with Project Matador, a large data center proposal being developed in Amarillo, Texas, by the Rick Perry-backed startup Fermi Americas. Project Matador is purportedly going to be massive and Fermi claims its supposed to one day reach 11 GW, which would make it one of the biggest data centers in the world.
Fermi’s plans have focused on relying on nuclear power in the future. But the only place they’ve made real progress so far in getting permits is gas generation. In February, the Texas Commission on Environmental Quality gave Fermi its air permit for building and operating up to 6 gigawatts of gas power at Project Matador. At that time, Fermi was also rooting for relaxed New Source Review standards, applauding EPA in comments to media for signaling it would take this step. The company’s former CEO Toby Neugebauer also told investors on their first earnings call that Trump officials personally intervened to help get them gas turbines from overseas. (There’s scant public evidence to date of this claim and Neugebauer was fired by Fermi’s board last month.)
But now Fermi’s permit is also being threatened in court. In April, a citizens group Panhandle Taxpayers for Transparency filed a lawsuit against TCEQ challenging the validity of the permit. The case centers around whether the commission was right to deny a request for a contested case hearing brought by members of the group who lived and worked close to Project Matador. “Once these decisions are made, they don’t get reversed,” Michael Ford, Panhandle Taxpayers for Transparency’s founder, said in a fundraising video.
This is also a financial David vs. Goliath, as Ford admits in the fundraising video they have less than $2,000 to spend on the case – a paltry sum they admit barely covers legal bills. We’re also talking about a state that culturally and legally sides often with developers and fossil fuel firms.
At the same time, this lawsuit couldn’t come at a more difficult time as Fermi is struggling with other larger problems (see: Neugebauer’s ouster). Eric Allman, one of the attorneys representing Panhandle Taxpayers for Transparency, told me they’re still waiting on a judge assignment and estimated it’ll take about one year to get a ruling. Allman told me legally Fermi can continue construction during the legal challenge but there are real risks. “Applicants on many occasions will pause activity while there is an appeal pending,” he told me, “because if the suit is successful, they won’t have an authorization.”
Aerial photos reported by independent journalist Michael Thomas purportedly show Fermi hasn’t done significant construction since obtaining its air permit. Fermi did not respond to multiple requests for comment on the lawsuit.
Industry attorneys I spoke to who wished to remain anonymous told me it was too early to say whether EPA’s rulemaking would exacerbate local conflicts by making things move faster. “A lot of times the environmental community likes to litigate things in the hope delays will kill a project, so in that regard, this strategy may be harder for them to implement now,” one lawyer told me. “But just because a plant gets a permit doesn’t mean they can build.”
Environmental lawyers, meanwhile, clearly see more potential for social friction in a faster process. Keri Powell of the Southern Environmental Law Center compared this EPA action to xAI’s rapid buildout in Tennessee and Mississippi where the Al company’s construction of gas turbines before it received its permits has only added to local controversy. This new rule would not make what xAI did permissible; this is a different matter. Yet there are thematic similarities between what the company is doing and the new permitting regime, with natural gas generation expanding faster when companies are allowed to start forms of site work before an air permit is issued.
“By the time a permit is issued, the company will be very, very far along in constructing a facility. All they’ll need to do is bring in the emitting unit, and oftentimes that doesn’t entail very much,” she said. “Imagine you’re a state or local permitting agency – your ability to choose something different than what the company already decided to do is going to be limited.”