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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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A letter from the Solar Energy Industries Association describes the administration’s “nearly complete moratorium on permitting.”
A major solar energy trade group now says the Trump administration is refusing to do even routine work to permit solar projects on private lands — and that the situation has become so dire for the industry, lawmakers discussing permitting reform in Congress should intervene.
The Solar Energy Industries Association on Thursday published a letter it sent to top congressional leaders of both parties asserting that a July memo from Interior Secretary Doug Burgum mandating “elevated” review for renewables project decisions instead resulted in “a nearly complete moratorium on permitting for any project in which the Department of Interior may play a role, on both federal and private land, no matter how minor.” The letter was signed by more than 140 solar companies, including large players EDF Power Solutions, RES, and VDE Americas.
The letter reinforces a theme underlying much of Heatmap’s coverage since the memo’s release — that the bureaucratic freeze against solar decision-making has stretched far beyond final permits to processes once considered ancillary. It also confirms that the enhanced review has jammed up offices outside Burgum’s purview, such as the Army Corps of Engineers, which oversees wetlands, water crossings, and tree removals, and requires Interior to sign off on actions through the interagency consultation process.
SEIA’s letter asserts that the impacts of Burgum’s memo stretch even to projects on private lands seeking Interior’s assistance to determine whether federally protected species are even present — meaning that regardless of whether endangered animals or flowers are there, companies are now taking on an outsized legal risk by moving forward with any kind of development.
After listing out these impacts in its letter, SEIA asked Congress to pressure Interior into revoking the July memo in its entirety. The trade group added there may be things Interior could do besides revoking the memo that would amount to “reasonable steps” in the “short-term to prevent unnecessary delays in energy development that is currently poised to help meet the growing energy demands of AI and other industries.” SEIA did not elaborate on what those actions would look like in its letter.
“Businesses need certainty in order to continue making investments in the United States to build out much-needed energy projects,” SEIA’s letter reads. “Certainty must include a review process that does not discriminate by energy source.” It concludes: “We urge Congress to keep fairness and certainty at the center of permitting negotiations.”
Notably, the letter arrived after American Clean Power — another major trade group representing renewable energy companies — backed a major GOP-authored permitting bill called the SPEED Act that is moving through the House. Although the bill has some bipartisan support from the most moderate wing of the House Democratic caucus, it has yet to win support from Democrats involved in bipartisan permitting talks, including Representative Scott Peters, who told me he’d back the bill only if Trump were prevented from stalling federal decision-making for renewable energy projects.
SEIA has deliberately set itself apart from ACP in this regard, telling me last week that it was neutral on the legislation as it stands. In a statement released with the letter to Congress, the trade group’s CEO, Abigail Ross Hopper, said that while “the solar industry values the continued bipartisan engagement on permitting reform, the SPEED Act, as passed out of committee, falls short of addressing this core problem: the ongoing permitting moratorium.”
“To be clear, there is no question we need permitting reform,” Hopper stated. “There is an agreement to be reached, and SEIA and our 1,200 member companies will continue our months-long effort to advocate for a deal that ensures equal treatment of all energy sources, because the current status of this blockade is unsustainable.”
In a statement to Heatmap News, Interior spokesperson Alyse Sharpe confirmed the agency is using its “current review process” on “federal resources, permits or consultations” related to solar projects on “federal, state or private lands.” “This policy strengthens accountability, prevents misuse of taxpayer-funded subsidies and upholds our commitment to restoring balance in energy development.” The agency declined to comment on SEIA’s request to Congress, though. “We don’t provide comment on correspondence to Congress regarding Interior issues via the media,” Sharpe said.
A new model from Johns Hopkins’ Net Zero Industrial Policy Lab uses machine learning to predict tomorrow’s industrial powerhouses.
It’s no secret that China, Japan, and Germany are industrial powerhouses, with vast potential in clean tech manufacturing. So how’s a less industrialized nation with an eye on the economy of the future supposed to compete? Are protectionist policies such as tariffs a good way to jumpstart domestic manufacturing? Should it focus on subsidizing factory buildouts? Or does the whole game come down to GDP?
According to a new machine learning tool from Johns Hopkins’ Net Zero Industrial Policy Lab, none of the above really matters all that much. Many of the policies that dominate geopolitical conversations aren’t strongly correlated with a country’s relative industrial potential, according to the model. The same goes for country-specific characteristics such as population, percentage of industry as a share of GDP, and foreign direct investment, a.k.a. FDI. What does count? A nation’s established industrial capabilities, and the degree to which they cross over to climate tech.
The purpose of the tool, named the Clean Industrial Capabilities Explorer, is to help policymakers “X-ray your country’s existing industrial base to identify what are your genuine strengths,” Tim Sahay, co-director of the lab, told me. The model, he explained, can identify “which core capabilities in your underlying industrial know-how are weak. That is like a diagnosis of what you should get into.”
The model calculates competitiveness across 10 clean energy technologies: solar, wind, batteries, electrolyzers, heat pumps, permanent magnets, nuclear, biofuels, geothermal, and transmission. That analysis ultimately surfaced five “core capabilities” that are most predictive of a country’s relative strength in each technology area: electronics, industrial materials, machinery, chemicals, and metals. Strength in geothermal, for example, is highly correlated with a machinery-focused industrial base, since building a geothermal plant requires expertise in making drilling rigs, heat exchangers, and steam turbines.
This “X-ray” of national capabilities not only confirms the dominance of leading Asian and European manufacturing economies, it also surfaces a group of lesser-known nations that appear well-positioned to become major future producers and exporters of key clean technologies. These so-called “future stars” include a handful of Central European countries — Czechia, Slovenia, Hungary, Slovakia, and Poland — plus the Southeast Asian economies of Malaysia, the Philippines, Thailand, and Vietnam. In Africa, Ethiopia emerges as the most promising economy.

Take Hungary as an example — its core competencies are machinery, electronics, and chemicals, making the country highly competitive when it comes to producing components for batteries, biofuels, and the machinery critical for geothermal power plants. The U.S., by comparison, excels at nuclear, electrolyzers, biofuel, and geothermal.
Many of the European future stars appear to benefit from their proximity to Germany, long an industrial stronghold in the region. “Poland, for example, received a huge amount of German FDI in the late 90s, early 2000s,” Sahay told me, explaining that countries in this region built up strength in their chemicals and metals sectors under the influence of the Soviet Union. Germany then set up these countries as key suppliers for its various industries, from autos to chemicals.
Of the 10 countries identified as rising stars, all of them received Chinese investment sometime in the past 10 years, Sahay said. “What we are seeing is decisions that have been made over the last couple of decades are bearing fruit in the 2020s,” he said, explaining that all of the countries on the list “were identified as places for potential investment by the world’s leading industrial firms in the 2000s or 2010s.”
This has led Bentley Allan, a political science professor and co-director of the policy lab, to think that China is likely doing some modeling of its own to determine where to direct its investments. Whatever the country is working with, it’s arriving at essentially the same conclusions regarding which nations show strong industrial potential, and are thus attractive targets for investment. “China isn’t the only one who can benefit from that strategy, but they’re the only ones being strategic about it at the moment,” Allan told me.
Allan’s hope is that the tool will democratize the knowledge that’s helped China dominate the global clean tech economy. “No one’s produced a global tool that enables not just China to invest strategically, but enables the U.S. to invest strategically, enables the UK to invest strategically in the developing world,” he explained. That’s critical when figuring out how to build an industrial base that can weather geopolitical tensions that might necessitate, say, a shift away from Chinese imports or Russian gas.
While it might not be particularly surprising that a country’s existing industrial capabilities strongly correlate with its potential industrial capabilities, the reality is that in many cases, getting a clear view of a country’s actual core competencies is not so straightforward. That’s because, as Allan told me, economists simply haven’t made widely available tools like this before. “They’ve made other tools for managing the macroeconomic environment, because for 60 years we basically thought that that was the only lever worth pulling,” he said.
Due to that opacity around industrial strength, model was able to yield some findings that the researchers found genuinely surprising. For example, not only did the tool show that countries such as the Philippines and Malaysia have stronger manufacturing bases than Allan would have guessed, it ranked Italy higher than Germany in overall competitiveness, showing solid potential in the nuclear, transmission, heat pump, electrolyzer, and geothermal industries.
That illustrates another complication the model solves for — namely that the countries with the most potential aren’t always the ones pursuing the most robust or intentional green industrial strategies. Both Italy and Japan, for instance, are well-positioned to benefit from a more explicit, structured focus on climate tech manufacturing, Allan told me.
Industrial strength will likely not be achieved through broad economic policies such as tariffs, subsidies, or grant programs, however, according to the model. Say for example that a country wants to deepen its expertise in solar manufacturing. “The things that you might want to invest in are things like precision machinery to produce the cutters that actually are used to cut the polysilicon into wafers,” Allan told me. “It’s more about making targeted investments in your industrial base in order to produce highly competitive niches as a way to then make you more competitive in that final product.”
This approach prevents countries from simply serving as final assemblers of battery packs or solar panels or other green products — a stage that provides low value-add, as countries aren’t able to capture the benefits of domestic research and development, engineering expertise, or intellectual property. Pinpointing strategic niches also helps countries avoid wasting their money in buzzy industries where they’re simply not competitive.
“The industrial policy race is very much hype-driven. It’s very much driven by, oh my god, we need a hydrogen strategy, and, oh my god, we need a lithium strategy,” Sahay told me. “But that’s not necessarily going to be what your country is going to be good at.” By pointing countries towards the industries and links in the supply chain where they actually could excel, Sahay and Allan can demonstrate they stand to benefit from the clean energy transition at large.
Or to put it more broadly, when done correctly, “industrial policy is climate policy, in the sense that when you advance industry generally, you are actually advancing the climate,” Allan told me. “And climate policy is industrial policy, because when you are trying to advance the climate, you advance the industrial base.”
On diesel backup generators, Chinese rare earths, and geothermal milestones
Current conditions: A polar vortex is sending Arctic air across the Upper Midwest and Northeast, bringing more than a foot of snow to parts of Michigan • In the Pacific Northwest, an atmospheric river is set to bring rain showers on the coast and snow inland • The death toll from flooding across Southeast Asia has surpassed 1,300.
The Department of Transportation is poised to significantly weaken fuel efficiency requirements for tens of millions of new cars and light trucks, President Donald Trump announced Wednesday. Heatmap's Robinson Meyer explained: “The United States essentially has two ways to regulate pollution from cars and light trucks: It can limit greenhouse gas emissions from new cars and trucks, and it can require the fuel economy from new vehicles to get a little better every year. Trump is pulling screws and wires out of both of these systems.” Flanked by auto executives in the Oval Office, Trump announced that new vehicles in 2031 would only need to average 34.5 miles per gallon, down from the 50 miles per gallon goal the Biden administration set. While carmakers publicly cheered the move, executives “privately fretted” to The New York Times “that they are being buffeted by conflicting federal policies” after spending billions of dollars to prepare to manufacture electric vehicles.
The administration claimed the rollback would save Americans $109 billion over five years and shave $1,000 off the average cost of a new car. But as Rob noted in August, the administration’s fight against tailpipe emissions could actually end up raising the price of gasoline.

Secretary of Energy Chris Wright pitched tapping into backup generators at data centers, hospitals, and factories to augment the supply of power on the grid. Speaking at the North American Gas Forum on Tuesday, Wright said the generators — most of which run on diesel, natural gas, or fuels such as propane — could contribute roughly 35 gigawatts of electricity. “We have 35 gigawatts of backup generators that are sitting there today, and you can’t turn them on. That’s just nuts. Emissions rules or whatever … people, come on,” Wright said, according to E&E News. “If we just turn those generators on for a few hours a year, we’ve expanded the capacity of our grid by 35 gigawatts. That’s massive.”
In a post on X, Aaron Bryant, an energy markets analyst at the law firm White & Case, called the proposal “shortsighted at best,” since the generators expose load growth to some measure of commodity risk and “unworkable at worst” because zoning ordinances, air pollution, and noise restrictions may prohibit use of the generators.
The National Petroleum Council, an advisory panel at the Energy Department, submitted its recommendations Wednesday for how to reform federal permitting rules. Among the proposals was an endorsement of an idea to bar federal agencies from yanking already-granted permits. Democrats in Congress put forward the concept to prevent the Trump administration from reversing approvals for offshore turbines and other renewable projects targeted by the White House.
The proposal marks a significant step within the executive branch, given that Trump himself is “the biggest wild card in permitting reform,” as Heatmap’s Jael Holzman wrote last month. But legislation is moving in Congress. In the House, the SPEED Act overwhelmingly won a committee vote last month. Now Arkansas Senator Tom Cotton, a Republican, has introduced a new bill in the Senate with its own House version.
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Following a summit between Trump and Chinese President Xi Jinping in October, Beijing agreed to overhaul its licensing regime for approving exports of rare earths to allow for streamlined permits to sell the metals overseas. At least three Chinese manufacturers of rare earth magnets have now secured new licenses to speed up exports to some customers, Reuters reported. It’s a sign of easing tensions between Washington and Beijing, offering some reprieve from the Chinese export restrictions that threatened to choke off the U.S. supply of key metals. But it’s still tenuous. China could ratchet up restrictions again, and the U.S. is still looking to increase domestic production of critical minerals to counter the leverage the People’s Republic wields through its near monopoly on the metals.
If there’s one thing Tim Latimer, the chief executive of the next-generation geothermal company Fervo Energy, wants to see in any permitting reform, it’s measures to making building new transmission lines easier. “The biggest threat to American global competitiveness, and it does not matter if your priorities are climate change, affordability, the AI race, national security or all of the above, is our country’s complete inability to build and upgrade transmission at any meaningful scale,” Latimer wrote in a post on X. Fervo is working on building the nation’s first full-scale next-generation geothermal plant in Utah, and running new transmission lines out to remote parts of the desert where it’s often best to drill for hot rocks is costly.
Fervo isn’t the only geothermal company making news. On Thursday morning, Zanskar, a geothermal startup that uses modern prospecting methods to find new conventional resources, announced that it had made the biggest “blind” discovery in the U.S. in more than 30 years. A “blind” find is a geothermal system that shows no visible signs of what’s below the surface, such as vents or geysers. While companies such as Fervo aim to use fracking technology to create reservoirs in hot rocks located where there aren’t underground aquatic formations to tap into, Zanskar is betting that using artificial intelligence to locate new conventional resources can result in faster, cheaper geothermal plants than next-generation technology can yield.
Here’s a little exclusive for you to end on: I got a copy of a letter signed by dozens of pro-nuclear advocates calling on New York state and local officials to kickstart an effort to rebuild the Indian Point nuclear plant just north of New York City. Describing the “forced premature closure” of the plant as “a major setback for New York,” the letter said the plant could be restored, noting that rising demand for clean, firm electricity has spurred utilities in Michigan, Iowa, and Pennsylvania to embark on historic restarts of decommissioned reactors. “Recommissioning Indian Point would stabilize electricity prices and deliver one of the fastest and largest returns of clean power available anywhere in the country,” the letter reads.