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Time is not our friend when it comes to climate change. The value of lowering greenhouse gas emissions today is greater than doing it in five years because every molecule of carbon we emit between now and then will accumulate in the atmosphere. You, as an individual, can’t make your utility build or buy more solar power more quickly. But you can start generating carbon-free kilowatts at home in a matter of weeks. (For more on that, check out our guide to getting rooftop solar.)
There is a heated debate among clean energy experts about the value of rooftop solar in the climate fight. Heatmap contributor and Princeton professor Jesse Jenkins argues that because big utility-scale solar installations are so much cheaper to build, rooftop solar rarely does little more than crowd out these projects, making our future clean energy system more expensive.
But as Eric O’Shaughnessy, a renewable energy market research analyst, told me, we don’t have a central planner who can wave a wand and manifest the most cost effective system. And in the real world, economics isn't the only factor determining what we build. Although the U.S. is now building more renewable energy than it has in the past, and the cost is now on par with — if not lower than — new fossil fuel generation, the clean energy industry is battling serious headwinds. A stubborn trifecta of inflation, supply chain constraints, and high interest rates has slowed utility-scale development compared to what it might have looked like. Community opposition to clean energy projects has increased and will likely worsen as the least-controversial sites for development get used up. And we simply do not have enough power lines to accommodate new clean generation — solar and wind projects are waiting years to get approval to connect to the transmission system.
All of this is becoming a problem for our climate goals. A recent Rhodium Group report found that the pace of clean energy deployment has lagged projections of what programs under the Inflation Reduction Act could be achieving — projections that already fall short of how much we should be building to meet our emissions targets. Though some of the challenges may ease — for example, the Federal Reserve just cut interest rates, which had become a significant obstacle for clean energy deployment — others are likely to take longer to resolve.
Homeowners, by contrast, can avoid land-use conflicts and act comparatively swiftly. “This is a space that's not being used,” O’Shaughnessy said. “Most people don't ever go to their roof. There’s no site acquisition. You don’t have to worry about an endangered turtle.”
The immediate emissions benefits of installing solar really depend on where you live and how dirty your local grid is, among other factors. But the reason we still put rooftop solar in the number two slot is that it’s such a high leverage climate action in other ways. For example, having a solar array can help you afford future investments in other climate solutions like heat pumps and EVs, because it mitigates against electric bill increases. It can also reduce overall electricity demand in your neighborhood, which may help your utility avoid costly grid upgrades and keep rates lower in your area.
If you pair your solar array with a battery, you may be able to join a utility program that synchronizes thousands of these systems in your region to decrease strain on the grid, avoid blackouts, and preempt the need to deploy fossil fueled “peaker” plants in periods of especially high demand. Various estimates from the Department of Energy and private research firms have found that such “virtual power plants” have the potential to save billions of dollars over the next decade. These programs will typically pay you to participate, too.
Researchers have also found that rooftop solar is “contagious” — one new installation in a neighborhood can cascade into several. “If you install solar, you are going to go through a process that most people have not,” O’Shaughnessy told me. “In doing that, you are going up this learning curve, and all of that is something that you can share with your friends, neighbors, family after the fact.”
If you’re a renter, or if you aren’t able to get rooftop solar today for some other reason, subscribing to a community solar project is another way to help speed up solar deployment in your region and reap some of the benefits that homeowners have access to. Community solar arrays are usually small installations on warehouse roofs, parking lots, or beside highways. Subscribers sign up for a portion of the electricity produced, and receive credits on their electric bills the same way they would with a rooftop system. These projects aren’t available everywhere, though. Solar United Neighbors, who we consulted for our rooftop solar guide, has more background reading and a directory of projects you can subscribe to.
(A brief note on a third option: choosing a “green” retail electricity provider. This is a much more indirect way to support the energy transition, and experts are split on whether it’s worth doing at all. In theory, it sends a demand signal for renewables and helps new projects get built, but there’s no way to really know how far your money is going. Because the benefits are not guaranteed, we are not including this option in this package.)
Getting rooftop solar can be a big, confusing project, and our guide on the subject will walk you through everything you need to know to feel prepared to tackle it.
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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.”
The Interior Department could not be immediately reached for comment. We will update this story if we hear from them.
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.