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Much may depend on the Senate’s tolerance for fuzzy math.

House Republicans passed a budget blueprint Thursday morning that lays the groundwork for the party to begin drafting legislation to enact President Trump’s agenda. Now the fight over the Inflation Reduction Act’s clean energy tax credits begins in earnest.
The blueprint is merely a set of instructions for writing the eventual budget bill, laying out topline numbers for tax cuts and spending reductions — it doesn’t contain any actual policies. Trump’s biggest priorities are to extend the tax cuts he enacted in 2017, pass new tax cuts on tips and overtime pay, and to boost spending on immigration control and defense.
The resolution that Republicans passed allows for all of the above. In total, it enables Congress to craft a bill that would increase the national debt over the next decade by more than $5 trillion.
The good news for the IRA tax credits is that the framework only requires lawmakers to craft legislation that would produce $4 billion in savings — a relatively small amount that doesn't exert much pressure on cutting the tax credits. The bad news is that Senate Republicans have given their word to budget hawks in the House that they will aim to cut much more than that — at least $1.5 trillion in spending. House Republicans, for their part, are eager to do at least $2 trillion in deficit reductions.
According to a “menu” of budget proposals that made its way around the Hill earlier this year, Republicans estimate they could save anywhere from $3 billion to $800 billion by repealing IRA tax credits, depending on how many and which ones are cut.
Lawmakers could also go after other climate-related policies, like cutting grant programs from the Department of Energy and Environmental Protection Agency. “Most of the funds have been obligated,” meaning they’re legally committed to grantees, “so there’s not much left to rescind,” Alex McDonough, a lobbyist with Pioneer Public Affairs, told me in an email. “We’ll see what they do with a possible rescission package, but even that would be a drop in the bucket compared to the trillions they want for offsetting tax cuts.”
Lobbyists on Capitol Hill and other experts I’ve spoken with over the past two weeks disagree about how much the numbers matter when it comes to whether and how much of the IRA will be repealed. Some felt the budget math would take priority, while others told me that if any of the tax credits were killed or saved, it would be for political reasons over anything else.
Though the biggest political target seems to be the electric vehicle tax credits, “anything with a price tag is at least somewhat vulnerable,” McDonough said. Lawmakers could also opt to make certain credits more difficult to access or phase them out earlier rather than fully repeal them.
McDonough also said the lobbying that companies and trade groups have been doing around the manufacturing and clean electricity tax credits appeared to be working, and will ratchet up even more in May. “Appealing to ‘all of the above’ and ‘energy dominance’ is working because everyone knows how badly we need new generation to meet rapidly rising demand and a lot of the clean energy resources happen to be the quickest to deploy,” he said. “Utilities want it too, which is also very important.”
On Thursday, Republican Senators Lisa Murkowski of Alaska and John Curtis of Utah sent a letter to their party’s leadership asking them to preserve tax credits that spur manufacturing, reduce energy costs for consumers, and give certainty to businesses that have already made investments in the U.S. based on the credits. Thom Tillis of North Carolina and Jerry Moran of Kansas also signed the letter. It was the first major show of support for the tax credits in the Senate, following a similar letter signed by 21 Republicans in the House.
Republicans are trying to enact Trump’s agenda using a special process called budget reconciliation, which will enable them to pass it with a simple 51-vote majority rather than the 60 votes required to overcome a filibuster. The party currently has 53 seats, so four Republicans coming out in favor of preserving IRA tax credits is a good sign for the law. Similarly, the Republicans have a seven-seat majority in the House, and so those 21 who like the IRA could have quite a bit of influence.
But the other big open question for the future of the IRA — and frankly, for the future of the Senate — is whether Republicans will proceed with the fuzzy math they are using to calculate the cost of the bill. When the Congressional Budget Office scores the extension of Trump's 2017 tax cuts, it will use what's called a "current law baseline," and estimate that they will cost the government more than $3 trillion dollars over the next ten years. Senate Republicans, however, have asserted that extending the 2017 tax cuts is free and will have no impact on the deficit, using a different scoring method called a “current policy baseline.”
The reason this matters for the IRA is that the budget reconciliation process has strict rules. If lawmakers were forced to recognize the true cost of the tax cut extensions in drafting the budget bill, they would have to make several trillion dollars’ worth of additional spending cuts in order to align with the blueprint they passed this week. In that scenario, it’s hard to see how any of the IRA could survive.
But if Republicans unify around this fuzzy math and carry it all the way to the final vote on the bill, which would be unprecedented, they could face a showdown with Democrats, who will say the bill doesn’t comply with the reconciliation rules. In that scenario, they’ll be faced with a choice either to go back to the drawing board or take the nuclear option — essentially changing how the Senate operates.
“There will be a majority vote on whether the Senate wants to change its precedents going forward, forever, and basically open up reconciliation to whatever policies the majority wants to enact going forward,” Charlie Ellsworth, another lobbyist for Pioneer Public Affairs, told me.
Expect to hear a lot more about this debate over the cost of the tax cuts once lawmakers return to Washington on April 28 after a two-week recess. Republicans have said they want to get the budget bill to Trump’s desk by Memorial Day. McDonough doesn’t think that’s in the cards, and expects it to happen by the August recess at best. But he expects the House Ways and Means committee to push out a first version of the bill in May, so we’ll see what the first proposal is for the fate of the IRA tax credits then.
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Any version of the future — even one under Trump — includes bits of the Inflation Reduction Act.
We passed a major milestone over the weekend: the one-year anniversary of President Trump’s One Big Beautiful Bill Act. That piece of legislation — which curtailed the wind and solar tax credits, ended incentives for electric vehicle buyers, and terminated a lot of green industrial policy — was signed into law on July 4, 2025. It also formally ended the era of decarbonization and climate policy experimentation that began when the United States passed the Inflation Reduction Act roughly three years earlier.
Now we’re far enough out to begin assessing the Trump law’s impact. And a fascinating new report, published today by the MIT Center for Energy and Environmental Policy Research, argues that the damage … is not as bad as one might fear — at least in the electricity sector.
The power sector has retained most of the quantifiable benefits associated with Biden’s climate law and Environmental Protection Agency rules, the new report asserts, and about two-thirds of the reductions in heat-trapping pollution expected under Biden’s policies will still happen under Trump’s. The report is called “Glass Half Full,” but its author, Lily Bermel, told me that her own conclusions went even further: “It’s not barely half full,” she said. “It’s like three-quarters full.”
We had the exclusive on the new report at Heatmap — check out our full story for more coverage, including interviews with critics of the analysis. Bermel also joined me on our Shift Key podcast to discuss her findings and what they suggest for the future of climate policy.
But in this more discursive space, I want to address head-on a question I think Bermel’s report raises: Was the Inflation Reduction Act worth it? If two-thirds of the emissions cuts expected under President Biden's policies are going to happen anyway (at least from the power sector), what was the point of those policies?
I posed this question directly to Bermel. She pointed me to a different source of MIT data: the Clean Investment Monitor, which tracks clean energy and industry investment in the United States across a range of sectors. That data shows that wind, solar, and storage investment did increase in the United States after the IRA passed, she said. “What the IRA did for wind and solar was good and impactful, but ultimately no longer necessary and worth the bang for buck,” she told me. (She added that the law’s other policies — such as its incentives for “clean firm” power plants such as geothermal that can run all day — did not go far enough.)
Ben King, a director at the Rhodium Group (which collaborates with MIT on the Clean Investment Monitor data), made another point when we chatted about the MIT report over the weekend. The new report compares visions of what the energy system will look like after Trump’s policies and Biden’s policies. But both of those scenarios contain a lot of the IRA’s policies, he said, because the solar and wind tax credits remain available in some form until the end of this decade. There simply is no version of the future that doesn’t have a lot of the IRA in it.
And that should, perhaps, reframe how we compare the emissions trajectories under Trump’s and Biden’s policies. It might sound like good news that 67% of the emissions cuts expected under Biden’s policies could still materialize under Trump’s. But it might also invite a certain nihilism — if most of the cuts were going to happen anyway, why did we have a big political fight over climate policy in the first place?
So it’s worth stating clearly that any fight over emissions or climate policy is partly about the emissions cuts that have not happened yet. Had the Inflation Reduction Act’s tax credits — or the EPA’s climate rules — been preserved, then emissions cuts might have gone even deeper than we once anticipated. In this way, there is always something proleptic about discussing emissions policy — really, you are trying to secure additional emissions reductions.
To put this another way, Bermel’s model suggests that the United States will build the same amount of offshore wind under Trump’s policies as it would under Biden’s (about 6 gigawatts). That happens, she said, because offshore wind is driven by state policy as much if not more than federal policy — and the state policy environment was souring even before Trump took office. But had Kamala Harris won in 2024, then Trump’s war on wind would never have happened, and states may have worked harder to salvage their offshore wind investments — or gone on to build even more.
There is no world, in other words, where Biden’s policies would have stood alone. Their success was always provisional, and their potential victory was always an invitation to further gains.
On energy inefficiency, global green H2, and New Hampshire’s guerrilla solar
Current conditions: Super Typhoon Bavi is slamming into Guam and the Northern Mariana Islands as the equivalent of a Category 5 hurricane, with sustained wind speeds topping 178 miles per hour • The record-shattering heat dome over the central and eastern United States is easing and shifting westward until mid July • In Europe, however, the heat is continuing, with temperatures hitting 108 degrees Fahrenheit in southern Spain over the weekend.
America’s next nuclear reactor is coming to life via resurrection. For the past two years, Holtec International has been working to bring the single reactor at the decommissioned Palisades nuclear plant in western Michigan back into service. It would be the first time in U.S. history that a permanently shuttered nuclear plant came back online. If successful, a growing list of projects are lining up to follow in Palisades’ footsteps. On Friday, Holtec announced that the Palisades crew had completed “the last of the major projects,” marking a “watershed moment” in the restoration effort. “We’re now focused on safely executing the remaining testing, verification, and operational readiness activities required before startup,” Michael Schultheis, Holtec’s vice president of the plant, said in a statement. “The plant is coming back together, and the professionalism and dedication demonstrated by our workforce continue to move the project forward.”
The news came just days after the U.S. District Court for the Western District of Michigan dismissed a lawsuit challenging the procedure by which the Nuclear Regulatory Commission approved Palisades’ restart. Started under the Biden administration, the revival project was one of the first the Trump administration allowed to move forward after taking office, part of a broader effort by the Department of Energy to spur a resurgence of reactor construction in the U.S.
Last week, the U.S. Court of Appeals for the Ninth Circuit blocked a challenge to California’s rules on emissions from industrial boilers, the latest legal victory for local regulations on planet-heating pollution from buildings. In 2024, the South Coast Air Quality Management District, the air pollution agency in charge of broad swaths of Southern California, set new restrictions on smog-causing nitrogen oxide from industrial boilers, appliances that either burn a fossil fuel such as gas or oil or use electricity to heat up water. The policy — which would slash the equivalent of half the nitrogen oxide produced by every car in Los Angeles combined — is part of the state’s long-standing effort to curb pollution. It’s not the only win for the fight to curb emissions from buildings. Since 2024, federal courts have repeatedly upheld local and state authority to regulate pollution from buildings in New York, Maryland, and Washington, D.C.
On Thursday, meanwhile, the Trump administration proposed a new rule to gut money-saving standards for appliances nationwide. “While the agency portrayed the move as bringing an end to appliance standards writ large, that is not, in fact, what it is doing,” Heatmap’s Emily Pontecorvo wrote last week. “The proposal would update the DOE’s so-called ‘Process Rule,’ which governs how the agency develops standards, adding onerous requirements that will make it much more difficult to make any changes at all.” When I spoke to the American Council for an Energy-Efficient Economy about the changes, the advocacy group told me the proposal would set minimum savings thresholds below which the new rule wouldn’t find federal support. It would also add a mandatory 180-day waiting period between before proposing new appliance standards based on novel testing procedures, require the Energy Department to show deference to industry-established standards, and force regulators to carry out extra analyses and rulemaking processes before enacting new rules.
Senator Angus King, the independent from Maine who caucuses with the Democrats, has urged the Federal Energy Regulatory Commission to reject the proposed utility megamerger between NextEra Energy and Dominion Energy. In a letter last week to the agency, King said the combination of the two giants risked putting too much power in the hands of one company. “The combination would create the largest electric utility in the United States, concentrating an unprecedented mix of merchant generation, rate-based generation, and transmission assets in the hands of a single company with a documented record of using its market position and political resources to suppress competition that threatens its merchant revenues,” King said in the letter, according to Utility Dive. Specifically, he cited NextEra’s lobbying to derail the New England Clean Energy Connect project in 2021, a transmission line to connect the Northeast’s grid to the almost entirely renewable hydroelectric system in Quebec.
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Last week, the Environmental Protection Agency put out new regulatory guidance on the president’s “freedom to fix” agenda, reminding automakers of their “long-standing legal obligation to release the service information, training information, and tools necessary to diagnose and repair vehicles,” even if the driver could use what they learn to tamper with the emissions controls. Meanwhile, on Friday, President Donald Trump announced that he’d pardoned six people “who were persecuted by the Biden administration” and were either in prison or headed there for violating Clean Air Act prohibitions against rigging the vehicles’ emissions control systems. “While I know this sounds ridiculous, it is nevertheless a fact, and part of the Weaponization and Stupidity that our Country had to endure during four long years of Sleepy Joe Biden,” he wrote in a post on his Truth Social platform. “I AM SETTING THEM ALL FREE, RIGHT NOW!”
In non-emitting vehicle news, Rivian is eyeing a better sales year than expected. While the electric automaker previously said it would ship between 62,000 and 67,000 vehicles this year, it told investors on Thursday that it now expects to deliver between 65,000 and 70,000 vehicles, in what TechCrunch called “a small but potentially meaningful bump.” The announcement came the same week BYD crushed Tesla’s deliveries yet again, as I told you in my last newsletter.

Back in March, I told you that Chile’s most right-wing president since the fall of dictator Augusto Pinochet could take the country’s budding green hydrogen business in a different direction. Now President José Antonio Kast is doing just that. Last week, Chile’s state-owned Production Development Corporation, known by its Spanish acronym CORFO, announced plans to refocus the country’s strategy for green hydrogen on domestic use rather than exports, Hydrogen Insight reported.
China, as I have reported for you many times before, is going hard on green hydrogen, especially since the Iran War forced Beijing to ramp up efforts to find alternatives to imported fossil fuels. Here’s yet another data point: China just laid out plans to build the world’s largest green hydrogen plant using solid-oxide electrolyzers, which operate at higher temperatures. The facility will also produce, methanol, which uses hydrogen as a key ingredient. At peak capacity, the facility in rural Gansu province will produce 100,000 metric tons of renewable methanol per year for use in international shipping. Meanwhile, Spain is investing nearly $21 million into grants for hydrogen projects as the country seeks to make use of its booming solar industry. As I wrote last week, the surge in solar panels is creating problems for Spain, since its grid can’t handle all that power during peak daytime hours. Funneling that electricity into electrolyzers to make molecules that can be cleanly burned later may offer a solution.
Last month, I told you about a catchier term for the very small-scale solar panels being legalized to go on windowsills and balconies, opening the door to more apartment dwellers generating a small share of electricity themselves. That term, which I first read in Inside Climate News, is “guerilla solar.” Well, that solar rebel mindset is coming to the “Live Free or Die” state. On Thursday, New Hampshire Governor Kelly Ayotte, a Republican, put out a list of 74 bills she signed into law before Fourth of July weekend. Among them was SB-540, legalizing plug-in solar panels. The law will take effect on July 27, according to PluginSolarUS, an advocacy group.
Rob talks with Columbia’s Lily Bermel about where climate policy should go next.
Wait, is the climate policy landscape … in better shape than it looks?
Just over a year ago, President Trump passed the One Big Beautiful Bill Act. It repealed many of the Biden administration’s most aggressive climate policies, including tax credits for solar and wind energy.
Although those policies are gone, the emissions cuts they achieved remain largely intact — at least in the power sector, according to a new study that we’re covering exclusively at Heatmap. Lily Bermel, the report’s author and a visiting fellow at the Columbia Center on Global Energy Policy, argues that at least where energy generation is concerned, the glass is more than “half full.”
On this episode of Shift Key, Lily joins Rob to discuss what we learned from Biden’s big climate law, why it likely never would have achieved its projected emissions declines (at least not without a tremendous transmission buildout), and how studying its legacy changed her mind about policy going forward.
Shift Key is hosted by Robinson Meyer, the founding executive editor of Heatmap News.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
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Here is an excerpt from their conversation:
Robinson Meyer: Given that the IRA, in retrospect, in the power sector, kind of resolved any economic issue you would have making a project pencil out and revealed all these non-economic issues that actually constrain development, we are now looking at a political environment where we’re switching from mourning the IRA to saying, okay, what should happen next? And my colleague Emily Pontecorvo recently wrote a story about this question. But I think one of the big questions going forward, especially if Democrats take Congress at the end of this year is, well, should they fight to restore the tax credits? I can even see a world where restoring the tax credits becomes something people insist on to get permitting reform or something.
After writing this report, did you come to the conclusion that Democrats should restore the wind and solar tax credits? Is that the most urgent priority for climate policy?
Lily Bermel: In writing this report, I became quite confident that I don’t think it’s worth the bang for buck in restoring those wind and solar tax credits, and instead that the supply side constraints are the real issue that we need to focus on. I did this lag analysis where if you take a given year, say 2031, and you see that the IRA trajectory would have deployed like more than 300 gigawatts of solar, how many years later would the [OBBBA] scenario do that? There’s only a two and a half-year lag, or gap. And so in restoring the clean energy tax credits, you are only buying back two and a half years’ worth of deployment, which, at least for me, was a lot smaller than I had thought.
Meanwhile, both scenarios have a literal cap in them about how much they can build and how fast they can build it. So even if you buy back that little two and a half-year average annual lag, you’re going to run up to the exact same ceiling. So restoring the tax credits brings you closer to that ceiling, while permitting reform will completely lift the ceiling and be a rising tide that lifts all boats.
You can find a full transcript of the episode here.
Mentioned:
The “Glass Half Full” report
More from Rob on Lily’s findings
From Heatmap: The Wind and Solar Tax Credits Are About to Expire. Will They Come Back?
Heatmap’s cheat sheet on how the One Big Beautiful Bill Act changed America’s clean energy law
Previously on Shift Key: What Has All This Back-and-Forth Climate Legislating Bought Us?
Jesse Jenkins’ paper on transmission’s role in achieving the IRA’s goals
Brendan Duke’s policy affordability framework
This episode of Shift Key is sponsored by ...
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Music for Shift Key is by Adam Kromelow.