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The Biden administration is hoping they’ll be a starting gun for the industry. The industry may or may not be fully satisfied.
In one of the Biden administration’s final acts to advance decarbonization, and after more than two years of deliberation and heated debate, the Treasury Department issued the final requirements governing eligibility for the clean hydrogen tax credit on Friday.
At up to $3 per kilogram of clean hydrogen produced, this was the most generous subsidy in the 2022 Inflation Reduction Act, and it came with significant risks if the Treasury did not get the rules right. Hydrogen could be an important tool to help decarbonize the economy. But without adequate guardrails, the tax credit could turn it into a shovel that digs the U.S. deeper into a warming hole by paying out billions of dollars to projects that increase emissions rather than reducing them.
In the final guidelines, the Biden administration recognized the severity of this risk. It maintained key safeguards from the rules proposed in 2023, while also making a number of changes, exceptions, and other “flexibilities” — in the preferred parlance of the Treasury Department — that sacrifice rigorous emissions accounting in favor of making the program easier to administer and take advantage of.
For example, it kept a set of requirements for hydrogen made from water and electricity known as the “three pillars.” Broadly, they compel producers to match every hour of their operation with simultaneous clean energy generation, buy this energy from newly built sources, and ensure those sources are in the same general region as the hydrogen plant. Hydrogen production is extremely energy-intensive, and the pillars were designed to ensure that it doesn’t end up causing coal and natural gas plants to run more. But the final rules are less strict than the proposal. For example, the hourly matching requirement doesn’t apply until 2030, and existing nuclear plants count as new zero-emissions energy if they are considered to be at risk of retirement.
Finding a balance between limiting emissions and ensuring that the tax credit unlocks development of this entirely new industry was a monumental challenge. The Treasury Department received more than 30,000 comments on the proposed rule, compared to about 2,000 for the clean electricity tax credit, and just 89 for the electric vehicle tax credit. Senior administration officials told me this may have been the most complicated of all of the provisions in the IRA. In October, the department assured me that the rules would be finished by the end of the year.
Energy experts, environmental groups, and industry are still digesting the rule, and I’ll be looking out for future analyses of the department’s attempt at compromise. But initial reactions have been cautiously optimistic.
On the environmental side, Dan Esposito from the research nonprofit Energy Innovation told me his first impression was that the final rule was “a clear win for the climate” and illustrated “overwhelming, irrefutable evidence” in favor of the three pillars approach, though he did have concerns about a few specific elements that I’ll get to in a moment. Likewise, Conrad Schneider, the U.S. senior director at the Clean Air Task Force, told me that with the exception of a few caveats, “we want to give this final rule a thumbs up.”
Princeton University researcher Jesse Jenkins, a co-host of Heatmap’s Shift Key podcast and a vocal advocate for the three pillars approach, told me by email that, “Overall, Treasury’s final rules represent a reasonable compromise between competing priorities and will provide much-needed certainty and a solid foundation for the growth of a domestic clean hydrogen industry.”
On the industry side, the Fuel Cell and Hydrogen Energy Association put out a somewhat cryptic statement. CEO Frank Wolak applauded the administration for making “significant improvements” but warned that the rules were “still extremely complex” and contain several open-ended parts that will be subject to interpretation by the incoming Trump-Vance administration.
“This issuance of Final Rules closes a long chapter, and now the industry can look forward to conversations with the new Congress and new Administration regarding how federal tax and energy policy can most effectively advance the development of hydrogen in the U.S.,” Wolak said.
Constellation Energy, the country’s biggest supplier of nuclear power, was among the most vocal critics of the proposed rule and had threatened to sue the government if it did not create a pathway for hydrogen plants that are powered by existing nuclear plants to claim the credit. In response to the final rule, CEO and President Joe Dominguez said he was “pleased” that the Treasury changed course on this and that the final rule was “an important step in the right direction.”
The California governor’s office, which had criticized the proposed rule, was also swayed. “The final rules create the certainty needed for developers to invest in and build clean, renewable hydrogen production projects in states like California,” Dee Dee Myers, the director of the Governor’s Office of Business and Economic Development, said in a statement. The state has plans to build a $12.6 billion hub for producing and using clean hydrogen.
Part of the reason the Treasury needed to find a Goldilocks compromise that pleased as many stakeholders as possible was to protect the rule from future lawsuits and lobbying. But not everyone got what they wanted. For example, the energy developer NextEra, pushed the administration to get rid of the hourly matching provision, which though delayed remained essentially untouched. NextEra did not respond to a request for comment.
Companies that fall on the wrong side of the final rules may still decide to challenge them in court. The next Congress could also make revisions to the underlying tax code, or the incoming Trump administration could change the rules to perhaps make them more favorable to hydrogen made from fossil fuels. But all of this would take time — a rule change, for example, would trigger a whole new notice and comment process. Though the one thing I’ve heard over and over is that the industry wants certainty, which the final rule provides, it’s not yet clear whether that will outweigh any remaining gripes.
In the meantime, it's off to the races for the nascent clean hydrogen industry. Between having clarity on the tax credit, the Department of Energy’s $7 billion hydrogen hubs grant program, and additional federal grants to drive down the cost of clean hydrogen, companies now have numerous incentives to start building the hydrogen economy that has received much hype but has yet to prove its viability. The biggest question now is whether producers will find any buyers for their clean hydrogen.
Below is a more extensive accounting of where the Treasury landed in the final rules.
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On “deliverability,” or the requirement to procure clean energy from the same region, the rules are largely unchanged, although they do allow for some flexibility on regional boundaries.
As I explained above, the Treasury Department also kept the hourly matching requirement, but delayed it by two years until 2030 to give the market more time to set up systems to achieve it — a change Schneider said was “really disappointing” due to the potential emissions consequences. Until then, companies only have to match their operations with clean energy on an annual basis, which is a common practice today. The new deadline is strict, and those that start operations before 2030 will not be grandfathered in — that is, they’ll have to switch to hourly matching once that extended clock runs out. In spite of that, the final rules also ensure that producers won’t be penalized if they are not able to procure clean energy for every single hour their plant operates, an update several groups applauded.
On the requirement to procure clean power from newly built sources, also known as “incrementality,” the department made much bigger changes. It kept an overarching definition that “incremental” generators are those built within three years of the hydrogen plant coming into service, but added three major exceptions:
1. If the hydrogen facility buys power from an existing nuclear plant that’s at risk of retirement.
2. If the hydrogen facility is in a state that has both a robust clean electricity standard and a broad, binding, greenhouse gas cap, such as a cap and trade system. Currently, only California and Washington pass this test.
3. If the hydrogen facility buys power from an existing natural gas or coal plant that has added new carbon capture and storage capacity within three years of the hydrogen project coming into service.
The hydrogen tax credit is so lucrative that environmental groups and energy analysts were concerned it would drive companies like Constellation to start selling all their nuclear power to hydrogen plants instead of to regular energy consumers, which could drive up prices and induce more fossil fuel emissions.
The final rules try to limit this possibility by only allowing existing reactors that are at risk of retirement to qualify. But the definition of “at risk of retirement” is loose. It includes “merchant” nuclear power plants — those that sell at least half their power on the wholesale electricity market rather than to regulated utilities — as well as plants that have just a single reactor, which the rules note have lower or more uncertain revenue and higher operational costs. Looking at the Nuclear Energy Institute’s list of plants, merchant plants make up roughly 40% of the total. All of Constellation Energy’s plants are merchant plants.
There are additional tests — the plant has to have had average annual gross receipts of less than 4.375 cents per kilowatt hour for at least two calendar years between 2017 and 2021. It also has to obtain a minimum 10-year power purchase agreement with the hydrogen company. Beyond that, the reactors that meet this definition are limited to selling no more than 200 megawatts to hydrogen companies, which is roughly 20% for the average reactor.
Esposito, who has closely analyzed the potential emissions consequences of using existing nuclear plants to power hydrogen production, was not convinced by the safeguards. “I don't love the power price look back,” he told me, “because that's not especially indicative of the future — particularly this high load growth future that we're quickly approaching with data centers and everything. It’s very possible power prices could go up from that, and then all of a sudden, the nuclear plants would have been fine without hydrogen.”
As for the 200 megawatt cap, Esposito said it was better than nothing, but he feels “it's kind of an implicit admission that it's not really, truly clean” to produce hydrogen with the energy from these nuclear plants.
Schneider, on the other hand, said the safeguards for nuclear-powered hydrogen projects were adequate. While a lot of plants are theoretically eligible, not all of their electricity will be eligible, he said.
The rules assert that in states that meet the two criteria of a clean electricity standard and a binding cap on emissions, “any increased electricity load is highly unlikely to cause induced grid emissions.”
But in a paper published in February, Energy Innovation explored the potential consequences of this exemption in California. It found that hydrogen projects could have ripple effects on the cap and trade market, pushing up the state’s carbon price and triggering the release of extra carbon emission allowances. “In other words, the California program is more of a ‘soft’ cap than a binding one — the emissions budget ‘expands or contracts in response to price bounds set by the legislature and [California Air Resources Board],’” the report says.
Esposito thinks the exemption is a risk, but that it requires further analysis and he’s not sounding the alarm just yet. He said it could come down to other factors, including how economical hydrogen production in California ends up being.
Producers are also eligible for the tax credit if they make hydrogen the conventional way, by “reforming” natural gas, but capture the emissions released in the process. For this pathway, the Treasury had to clarify several accounting questions.
First, there’s the question of how producers should account for methane leaked into the atmosphere upstream of the hydrogen plant, such as from wells and pipelines. The proposal had suggested using a national average of 0.9%. But researchers found this would wildly underestimate the true warming impact of hydrogen produced from natural gas. It could also underestimate emissions from natural gas producers that have taken steps to reduce methane leakage. “We branded that as one size fits none,” Schneider told me.
The final rules create a path for producers to use more accurate, project-specific methane emissions rates in the future once the Department of Energy updates a lifecycle emissions tool that companies have to use called the “GREET” model. The Environmental Protection Agency recently passed new methane emissions laws that will enable it to collect better data on leakage, which will help the DOE update the model.
Schneider said that’s a step in the right direction, though it will depend on how quickly the GREET model is updated. His bigger concern is if the Trump administration weakens or eliminates the EPA’s methane emissions regulations.
The Treasury also opened up the potential for companies to produce hydrogen from alternative, cleaner sources of methane, like gas captured from wastewater, animal manure, and coal mines. (The original rule included a pathway for using gas captured from landfills.) In reality, hydrogen plants taking this approach are unlikely to use gas directly from these sources, but rather procure certificates that say they have “booked” this cleaner gas and can “claim” the environmental benefits.
Leading up to the final rule, some climate advocates were concerned that this system would give a boost to methane-based hydrogen production over electricity-based production, as it's cheaper to buy renewable natural gas certificates than it is to split water molecules. Existing markets for these credits also often overestimate their benefits — for example, California’s low carbon fuel system gives biogas captured from dairy farms a negative carbon intensity score, even though these projects don’t literally remove carbon from the atmosphere.
The Treasury tried to improve its emissions estimates for each of these alternative methane sources to make them more accurate, but negative carbon intensity scores are still possible.
The department did make one significant change here, however. It specified that companies can’t just buy a little bit of cleaner methane and then average it with regular fossil-based methane — each must be considered separately for determining tax credit eligibility. Jenkins, of Princeton, told me that without this rule, huge amounts of hydrogen made from regular natural gas could qualify.
Producers also won’t be able to take this “book and claim” approach until markets adapt to the Treasury’s reporting requirements, which isn’t expected until at least 2027.
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Here at Heatmap, we write a lot about decarbonization — that is, the process of transitioning the global economy away from fossil fuels and toward long-term sustainable technologies for generating energy. What we don’t usually write about is what those technologies actually do. Sure, solar panels convert energy from the sun into electricity — but how, exactly? Why do wind turbines have to be that tall? What’s the difference between carbon capture, carbon offsets, and carbon removal, and why does it matter?
So today, we’re bringing you Climate 101, a primer on some of the key technologies of the energy transition. In this series, we’ll cover everything from what makes silicon a perfect material for solar panels (and computer chips), to what’s going on inside a lithium-ion battery, to the difference between advanced and enhanced geothermal.
There’s something here for everyone, whether you’re already an industry expert or merely climate curious. For instance, did you know that contemporary 17th century readers might have understood Don Quixote’s famous “tilting at windmills” to be an expression of NIMYBism? I sure didn’t! But I do now that I’ve read Jeva Lange’s 101 guide to wind energy.
That said, I’d like to extend an especial welcome to those who’ve come here feeling lost in the climate conversation and looking for a way to make sense of it. All of us at Heatmap have been there at some point or another, and we know how confusing — even scary — it can be. The constant drumbeat of news about heatwaves and floods and net-zero this and parts per million that is a lot to take in. We hope this information will help you start to see the bigger picture — because the sooner you do, the sooner you can join the transition, yourself.
Without further ado, here’s your Climate 101 syllabus:
Once you feel ready to go deeper, here are some more Heatmap stories to check out:
The basics on the world’s fastest-growing source of renewable energy.
Solar power is already the backbone of the energy transition. But while the basic technology has been around for decades, in more recent years, installations have proceeded at a record pace. In the United States, solar capacity has grown at an average annual rate of 28% over the past decade. Over a longer timeline, the growth is even more extraordinary — from an stalled capacity base of under 1 gigawatt with virtually no utility-scale solar in 2010, to over 60 gigawatts of utility-scale solar in 2020, and almost 175 gigawatts today. Solar is the fastest-growing source of renewable energy in both the U.S. and the world.
There are some drawbacks to solar, of course. The sun, famously, does not always shine, nor does it illuminate all places on Earth to an equal extent. Placing solar where it’s sunniest can sometimes mean more expense and complexity to connect to the grid. But combined with batteries — especially as energy storage systems develop beyond the four hours of storage offered by existing lithium-ion technology — solar power could be the core of a decarbonized grid.
Solar power can be thought of as a kind of cousin of the semiconductors that power all digital technology. As Princeton energy systems professor and Heatmap contributor Jesse Jenkins has explained, certain materials allow for electrons to flow more easily between molecules, carrying an electrical charge. On one end of the spectrum are your classic conductors, like copper, which are used in transmission lines; on the other end are insulators, like rubber, which limit electrical charges.
In between on that spectrum are semiconductors, which require some amount of energy to be used as a conductor. In the computing context these are used to make transistors, and in the energy context they’re used to make — you guessed it — solar panels.
In a solar panel, the semiconductor material absorbs heat and light from the sun, allowing electrons to flow. The best materials for solar panels, explained Jenkins, have just the right properties so that when they absorb light, all of that energy is used to get the electrons flowing and not turned into wasteful heat. Silicon fits the bill.
When you layer silicon with other materials, you can force the electrons to flow in a single direction consistently; add on a conductive material to siphon off those subatomic particles, and voilà, you’ve got direct current. Combine a bunch of these layers, and you’ve got a photovoltaic panel.
Globally, solar generation capacity stood at over 2,100 terawatt-hours in 2024, according to Our World in Data and the Energy Institute, growing by more than a quarter from the previous year. A huge portion of that growth has been in China, which has almost half of the world’s total installed solar capacity. Installations there have grown at around 40% per year in the past decade.
Solar is still a relatively small share of total electricity generation, however, let alone all energy usage, which includes sectors like transportation and industry. Solar is the sixth largest producer of electricity in the world, behind coal, gas, hydropower, nuclear power, and wind. It’s the fourth largest non-carbon-emitting generation source and the third largest renewable power source, after wind and hydropower.
Solar has taken off in the United States, too, where utility-scale installations make up almost 4% of all electricity generated.
While that doesn’t seem like much, overall growth in generation has been tremendous. In 2024, solar hit just over 300 terawatt-hours of generation in the U.S., compared to about 240 terawatt-hours in 2023 and just under 30 in 2014.
Looking forward, there’s even more solar installation planned. Developers plan to add some 63 gigawatts of capacity to the grid this year, following an additional 30 gigawatts in 2024, making up just over half of the total planned capacity additions, according to Energy information Administration.
Solar is cheap compared to other energy sources, and especially other renewable sources. The world has a lot of practice dealing with silicon at industrial scale, and China especially has rapidly advanced manufacturing processes for photovoltaic cells. Once the solar panel is manufactured, it’s relatively simple to install compared to a wind turbine. And compared to a gas- or coal-fired power plant, the fuel is free.
From 1975 to 2022, solar module costs fell from over $100 per watt to below $0.50, according to Our World In Data. From 2012 to 2022 alone, costs fell by about 90%, and have fallen by “around 20% every time the global cumulative capacity doubles,” writes OWID analyst Hannah Ritchie. Much of the decline in cost has been attributed to “Wright’s Law,” which says that unit costs fall as production increases.
While construction costs have flat-lined or slightly increased recently due to supply chain issues and overall inflation, the overall trend is one of cost declines, with solar construction costs declining from around $3,700 per kilowatt-hour in 2013, to around $1,600 in 2023.
There are solar panels at extreme latitudes — Alaska, for instance, has seen solar growth in the past few years. But there are obvious challenges with the low amount of sunlight for large stretches of the year. At higher latitudes, irradiance, a measure of how much power is transmitted from the sun to a specific area, is lower (although that also varies based on climate and elevation). Then there are also more day-to-day issues, such as the effect of snow and ice on panels, which can cause issues in turning sunlight into power (they literally block the panel from the sun). High latitudes can see wild swings in solar generation: In Tromso, in northern Norway, solar generation in summer months can be three times as high as the annual average, with a stretch of literally zero production in December and January.
While many Nordic countries have been leaders in decarbonizing their electricity grids, they tend not to rely on solar in that project. In Sweden, nuclear and hydropower are its largest non-carbon-emitting fuel sources for electricity; in Norway, electricity comes almost exclusively from hydropower.
There has been some kind of policy support for solar power since 1978, when the Energy Tax Act provided tax credits for solar power investment. Since then, the investment tax credit has been the workhorse of American solar policy. The tax credit as it was first established was worth 10% of the system’s upfront cost “for business energy property and equipment using energy resources other than oil or natural gas,” according to the Congressional Research Service.
But above that baseline consistency has been a fair amount of higher-level turmoil, especially recently. The Energy Policy Act of 2005 kicked up the value of that credit to 30% through 2007; Congress kept extending that timeline, with the ITC eventually scheduled to come down to 10% for utility-scale and zero for residential projects by 2024.
Then came the 2022 Inflation Reduction Act, which re-instituted the 30% investment tax credit, with bonuses for domestic manufacturing and installing solar in designated “energy communities,” which were supposed to be areas traditionally economically dependent on fossil fuels. The tax then transitioned into a “technology neutral” investment tax credit that applied across non-carbon-emitting energy sources, including solar, beginning in 2024.
This year, Congress overhauled the tax incentives for solar (and wind) yet again. Under the One Big Beautiful Bill Act, signed in July, solar projects have to start construction by July 2026, or complete construction by the end of 2027 to qualify for the tax credit. The Internal Revenue Service later tightened up its definition of what it means for a project to start construction, emphasizing continuing actual physical construction activities as opposed to upfront expenditures, which could imperil future solar development.
At the same time, the Trump administration is applying a vise to renewables projects on public lands and for which the federal government plays a role in permitting. Renewable industry trade groups have said that the highest levels of the Department of Interior are obstructing permitting for solar projects on public lands, which are now subject to a much closer level of review than non-renewable energy projects.
Massachusetts Institute of Technology Researchers attributed the falling cost of solar this century to “scale economies.” Much of this scale has been achieved in China, which dominates the market for solar panel production, especially for export, even though much of the technology was developed in the United States.
At this point, however, the cost of an actual solar system is increasingly made up of “soft costs” like labor and permitting, at least in the United States. According to data from the National Renewables Energy Laboratory, a utility-scale system costs $1.20 per watt, of which soft costs make up a third, $0.40. Ten years ago, a utility-scale system cost $2.90 per watt, of which soft costs was $1.20, or less than half.
Beyond working to make existing technology even cheaper, there are other materials-based advances that promise higher efficiency for solar panels.
The most prominent is “perovskite,” the name for a group of compounds with similar structures that absorb certain frequencies of light particularly well and, when stacked with silicon, can enable more output for a given amount of solar radiation. Perovskite cells have seen measured efficiencies upwards of 34% when combined with silicon, whereas typical solar cells top out around 20%.
The issue with perovskite is that it’s not particularly durable, partially due to weaker chemical bonds within the layers of the cell. It’s also more expensive than existing solar, although much of that comes down inefficient manufacturing processes. If those problems can be solved, perovskite could promise more output for the same level of soft costs as silicon-based solar panels.
The country’s largest source of renewable energy has a long history.
Was Don Quixote a NIMBY?
Miguel de Cervantes’ hero admittedly wasn’t tilting at turbines in 1605, but for some of his contemporary readers in 17th-century Spain, windmills for grinding wheat into flour were viewed as a “dangerous new technology,” author Simon Winchester writes in his forthcoming book, The Breath of the Gods: The History and Future of the Wind. One interpretation of Cervantes’ novel might be that Quixote was “actually doing battle with progress.”
Nearly four and a half centuries later, harnessing the energy of the wind remains controversial, even if the breeze is one of humankind’s longest-utilized resources. While wind is the largest source of renewable electricity generation in the United States today, high construction costs and local opposition have more recently stymied the industry’s continued expansion. The new presidential administration — suspicious of wind’s reliability and place in the American energy mix — has also been doing its very best to stunt any future growth in the sector.
Whether you’re catching up on Trump’s latest regulatory moves, you have your own concerns about the safety of the technology, or this is your first time even thinking about this energy resource, here is the blow-by-blow — sorry! — on wind power in the U.S.
At their most basic conceptual level, wind turbines work by converting kinetic energy — the energy of an object in motion; in this case, air particles — into electrical energy that can be used to power homes, buildings, factories, and data centers.
Like hydroelectric dams, turbines do this by first converting kinetic energy into mechanical energy. The wind turns the turbine blades, which spin a rotor that is connected to a generator. Inside the generator are magnets that rotate around coils of copper wire, creating a magnetic field that pushes and pulls the electrons within the copper. Voilà — and with gratitude to Michael Faraday — now you have an electrical current that can be distributed to the grid.
Turbines typically require an average wind speed of about 9 miles per hour to generate electricity, which is why they are constructed in deserts, mountain passes, on top of hills, or in shallow coastal waters offshore, where there is less in the way to obstruct the flow of wind. Higher elevations are also windier, so utility-scale wind turbines are frequently around 330 feet tall (though the largest turbines tower 600 feet or higher).
It depends on the size of the turbine and also the wind speed. The average capacity of a new land-based wind turbine in the U.S. was 3.4 megawatts in 2023 — but that’s the “nameplate capacity,” or what the turbine would generate if it ran at optimal capacity around the clock.
U.S. Department of Energy
In the U.S., the average capacity factor (i.e. the actual energy output) for a turbine is more like 42%, or close to two-fifths of its theoretical maximum output. The general rule of thumb is that one commercial turbine in the U.S. can power nearly 1,000 homes per month. In 2023, the latest year of data available, land-based and offshore wind turbines in the U.S. generated 425,235 gigawatt-hours of electricity, or enough to power 39 million American homes per year.
A common criticism of wind power is that it “stops working” if the wind isn’t blowing. While it’s true that wind is an intermittent resource, grid operators are used to coping with this. A renewables-heavy grid should combine different energy sources and utilize offline backup generators to prevent service interruptions during doldrums. Battery storage can also help handle fluctuations in demand and increase reliability.
At the same time, wind power is indeed dependent on, well, the wind. In 2023, for example, U.S. wind power generation dropped below 2022 levels due to lower-than-average wind speeds in parts of the Midwest. When you see a turbine that isn’t spinning, though, it isn’t necessarily because there isn’t enough wind. Turbines also have a “cut out” point at which they stop turning if it gets too windy, which protects the structural integrity of the blades and prevents Twisters-like mishaps, as well as keeps the rotor from over-spinning, which could strain or break the turbine’s internal rotating components used to generate electricity.
Though Americans have used wind power in various forms since the late 1800s, the oil crisis of the 1970s brought new interest, development, and investment in wind energy. “The American industry really got going after the suggestion from the Finns, the Swedes, the Danes,” who’d already been making advances in the technology, albeit on single-turbine scales, Winchester, the author of the forthcoming history of wind power, The Breath of the Gods, told me.
In the early 1970s, the Department of Energy issued a grant to William Heronemus, a professor at the University of Massachusetts, Amherst, to explore the potential of wind energy. Heronemus became “really enthusiastic and built wind generators on the campus,” helping to modernize turbines into the more familiar construction we see widely today, Winchester said.
Some of Heronemus’ former students helped build the world’s first multi-turbine wind farm in New Hampshire in 1981. Though the blades of that farm interfered with nearby television reception — they had to be paused during prime time — the technology “seemed to everyone to make sense,” Winchester said. The Energy Policy Act of 1992, which introduced production tax credits for renewables, spurred further development through the end of the millennium.
Heronemus, a former Naval architect, had dreamed in the 1970s of building a flotilla of floating turbines mounted on “wind ships” that were powered by converting seawater into hydrogen fuel. Early experiments in offshore wind by the Energy Research and Development Administration, the progenitor of the Department of Energy, weren’t promising due to the technological limitations of the era — even commercial onshore wind was still in its infancy, and Heronemus’ plans looked like science-fiction.
In 1991, though, the Danes — ever the leaders in wind energy — successfully constructed the Vindeby Offshore Wind Farm, complete with 11 turbines and a total installed capacity of 5 megawatts. The Blyth offshore wind farm in northern Wales soon followed, with the United States finally constructing its first grid-connected offshore wind turbines off of Maine in 2013. The Block Island wind farm, with a capacity of 30 megawatts, is frequently cited as the first true offshore wind farm in the U.S., and began operating off the coast of Rhode Island in 2016.
Though offshore wind taps into higher and more consistent wind speeds off the ocean — and, as a result, is generally considered more efficient than onshore wind — building turbines at sea comes with its own set of challenges. Due to increased installation costs and the greater wear-and-tear of enduring saltwater and storms at sea, offshore wind is generally calculated to be about twice as expensive as onshore wind. “It’s unclear if offshore wind will ever be as cheap as onshore — even the most optimistic projections documented by the National Renewable Energy Laboratory have offshore wind more expensive than the current price of onshore in 2035,” according to Brian Potter in his newsletter, Construction Physics, though he notes that “past projections have underestimated the future cost reductions of wind turbines.”
Scott Eisen/Getty Images
In the decade from 2014 to 2023, total wind capacity in the U.S. doubled. Onshore and offshore wind power is now responsible for over 10% of utility-scale electricity generation in the U.S., and has been the highest-producing renewable energy source in the nation since 2019. (Hydropower, the next highest-producing renewable energy source, is responsible for about 5.7% of the energy mix, by comparison.) In six states — Iowa, Kansas, Oklahoma, New Mexico, South Dakota, and North Dakota — onshore wind makes up more than a third of the current electricity mix, Climate Central reports.
Offshore wind has been slower to grow in the U.S. Even during the Biden administration, when the government targeted developing 30 gigawatts of offshore wind capacity by 2030, the industry faced financing challenges, transmission and integration obstacles, and limits in access to a skilled workforce, per a 2024 paper in Energy Research & Social Science. That same year, the Department of Energy reported that the nation had a total of 80,523 megawatts for offshore wind in operation and in the pipeline, which, under ideal conditions, could power 26 million homes. Many of those offshore projects and plans now face an uncertain future under the Trump administration.
Though we’re far removed from the 1880s, when suspicious Scots dismissed wind energy pioneer James Blyth’s home turbine as “the devil’s work,” there are still plenty of persistent concerns about the safety of wind power to people and animals.
Some worry about onshore wind turbines’ effects on people, including the perceived dangers of electromagnetic fields, shadow flicker from the turning blades, and sleep disturbance or stress. Per a 2014 systematic review of 60 peer-reviewed studies on wind turbines and human health by the National Institutes of Health, while there was “evidence to suggest that wind turbines can be a source of annoyance to some people, there was no evidence demonstrating a direct causal link between living in proximity to wind turbines and more serious physiological health effects.” The topic has since been extensively studied, with no reputable research concluding that turbines have poor health impacts on those who live near them.
Last year, the blade of a turbine at Vineyard Wind 1 broke and fell into the water, causing the temporary closure of beaches in Nantucket to protect people from the fiberglass debris. While no one was ultimately injured, GE Vernova, which owns Vineyard Wind, agreed earlier this year to settle with the town for $10.5 million to compensate for the tourism and business losses that resulted from the failure. Thankfully, as my colleague Jael Holzman has written, “major errors like blade failures are incredibly rare.”
There are also concerns about the dangers of wind turbines to some wildlife. Turbines do kill birds, including endangered golden eagles, which has led to opposition from environmental and local activist groups. But context is also important: The U.S. Fish & Wildlife Service has found that wind farms “represent just 0.03% of all human-related bird deaths in the U.S.” (Illegal shootings, for example, are the greatest cause of golden eagle deaths.) The continued use of fossil fuels and the ecological impacts of climate change also pose a far graver threat to birds than wind farms do. Still, there is room for discussion and improvement: The California Department of Fish and Wildlife issued a call earlier this year for proposals to help protect golden eagles from turbine collisions in its major wind resource areas.
Perhaps the strongest objection to offshore wind has come from concern for whales. Though there has been an ongoing “unusual mortality event” for whales off the East Coast dating back to 2016 — about the same time the burgeoning offshore wind industry took off in the United States — the two have been falsely correlated (especially by groups with ties to the fossil fuel industry). A recent government impact report ordered by Republicans even found that “NOAA Fisheries does not anticipate any death or serious injury to whales from offshore wind-related actions and has not recorded marine mammal deaths from offshore wind activities.” Still, that hasn’t stopped Republican leaders — including the president — from claiming offshore wind is making whales “a little batty.”
Polling by Heatmap has found that potential harm to wildlife is a top concern of both Democrats and Republicans when it comes to the deployment of renewable energy. Although there has been “no evidence to date that the offshore wind build-out off the Atlantic coast has harmed a single whale … studies have shown that activities related to offshore wind could harm a whale, which appears to be enough to override the benefits for some people,” my colleague Jael has explained. A number of environmental groups are attempting to prevent offshore and land-based wind development on conservationist grounds, to varying degrees of success. Despite these reservations, though, our polling has found that Americans on the coast largely support offshore wind development.
Aesthetic concerns are another reason wind faces opposition. The proposed Lava Ridge wind farm in Idaho, which was Heatmap’s most imperiled renewable energy project last year, faced intense opposition, ostensibly due to the visibility of the turbines from the Minidoka National Historic Site, the site of a Japanese internment camp. Coastal homeowners have raised the same complaint about offshore wind that would be visible from the beach, like the Skipjack offshore wind project, which would be situated off the coast of Maryland.
Not good. As one of President Trump’s first acts in office, he issued an executive order that the government “shall not issue new or renewed approvals, rights of way, permits, leases, or loans for onshore or offshore wind projects” until the completion of a “comprehensive assessment” of the industry’s impacts on the economy and the environment. Eight months later, federal agencies were still not processing applications for onshore wind projects.
Offshore wind is in even more trouble because such projects are sited entirely in federal waters. As of late July, the Bureau of Ocean Energy Management had rescinded all designated wind energy areas — a decision that applies to some 3.5 million acres of federal waters, including the Central Atlantic, California, and Oregon. The Department of the Interior has also made moves to end what it calls the “special treatment for unreliable energy sources, such as wind,” including by “evaluating whether to stop onshore wind development on some federal lands and halting future offshore wind lease sales.” The Interior Department will also look into how “constructing and operating wind turbines might affect migratory bird populations.”
The One Big Beautiful Bill Act, meanwhile, put strict restrictions on tax credits available to wind developers. Per Cleanview, the bill jeopardizes some 114 gigawatts of wind energy projects, while the Center for American Progress writes that “more than 17,000 jobs are connected to offshore wind power projects that are already canceled, on hold, or at risk from the Trump administration’s attacks on wind power.”
The year 2024 marked a record for new wind power capacity, with 117 gigawatts of wind energy installed globally. China in particular has taken a keen interest in constructing new wind farms, installing 26 gigawatts worth, or about 5,300 turbines, between January and May of last year alone.
Still, there are significant obstacles to the buildout of wind energy even outside of the United States, including competition from solar, which is now the cheapest and most widely deployed renewable energy resource in the world. High initial construction costs, deepened by inflation and supply-chain issues, have also stymied wind development.
There are an estimated 424 terawatts worth of wind energy available on the planet, and current wind turbines tap into just half a percent of that. According to Columbia Business School’s accounting, if maximized, wind has the potential to “abate 10% to 20% of CO2 emissions by 2050, through the clean electrification of power, heat, and road transport.”
Wind is also a heavy player in the Net Zero Emissions by 2050 Scenario, which aims for
7,100 terawatt hours of wind electricity generation worldwide by the end of the decade, per the International Energy Agency. But current annual growth would need to increase annual capacity additions from about 115 gigawatts in 2023 to 340 gigawatts in 2030. “Far greater policy and private-sector efforts are needed to achieve this level of capacity growth,” IEA notes, “with the most important areas for improvement being facilitating permitting for onshore wind and cost reductions for offshore wind.”
Wind turbines continue to become more efficient and more economical. Many of the advances have come in the form of bigger turbines, with the average height of a hub for a land-based turbine increasing 83% since the late 1990s. The world’s most powerful offshore turbine, Vestas’ V236-15.0 megawatt prototype, is, not coincidentally, also the world’s tallest, at 919 feet.
Advanced manufacturing techniques, such as the use of carbon fiber composites in rotor blades and 3D printed materials, could also lead to increases in efficiency. In a 2024 report, NREL anticipated that such innovations could potentially “unlock 80% more economically viable wind energy capacity within the contiguous United States.”
Floating offshore wind farms are another area of active innovation. Unlike the fixed-foundation turbines mainly used offshore today, floating turbines could be installed in deep waters and allow for development on trickier coastlines like off of Oregon and Washington state. Though there are no floating offshore wind farms in the United States yet, there are an estimated 266 gigawatts of floating turbine capacity in the pipeline globally.