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An excerpt from David Lipsky’s The Parrot and the Igloo: Climate and the Science of Denial
Let’s say you’ve shipped out as a denier.
You’re in it for the action, the dollars, the travel, the fun. And you shade your eyes, glance up at a tall number: 97%, the percentage of active-duty climate researchers who accept man-made climate change.
This is what pollster Frank Luntz understood in 2002. “Voters believe that there is no consensus about global warming,” Luntz wrote, in his famous battle memo. “Should the public come to believe that the scientific issues are settled, their views about global warming will change accordingly.”
And this is what was also understood by Dr. S Fred Singer and Frederick Seitz, two of the graybeard prophets who launched the global-warming skepticism movement in the 1990s, that crucial tipping point in the battle between the warmers and the deniers. A word — a concept, a percentage — was your enemy. And every six years the IPCC, the international climate science body, would stamp along on its five thousand legs and drop down another big dose of consensus. Plant it in the headlines of every newspaper. Here was the spot on the tree to carve your “X.” As you spit in your palms and lifted the axe.
Dr. Singer, an atmospheric physicist who would become one of the world’s most prominent climate deniers, tried twice. The anti-consensus petitions have names: The Leipzig Declaration, the Heidelberg Appeal. They sound like spy movies: lovelorn and crestfallen thrillers starring a tongue-tied Jason Bourne, about the cities where he tried to make his feelings known.
The appeal came first, in 1992. Dr. Singer and an associate helped arrange a conference in Heidelberg, Germany. Scientists were invited to sign a petition.
At first, Dr. Singer called it a “statement.” Time passed, coasts cleared. And he was like a man alone at the breakfast bar, filling his plate. Dr. Singer called it “strongly worded.” Said the appeal “expressed skepticism on the urgency for global action to restrict greenhouse-gas emissions.” That it “urged statesmen to go slow on climate-change policies.”
As it happens, the Heidelberg Appeal never once mentions global warming. It’s very pro-science. It’s just not at all anti-climate science.
But it was a list of science names and got weaponized anyway. When denial Senator James Inhofe quoted the petition in Congress, this is how the message ran. “The Heidelberg Appeal, which says that no compelling evidence exists to justify controls of anthropogenic greenhouse gas emissions. They agree it is a hoax.” Two possibilities: Either the senator had never read the appeal, or he hoped you hadn’t.
Dr. Singer took a firmer hand on the next go-round. New and improved — now with global warming.
This was 1995. Earlier that year, Dr. Singer had sent a fossil fuel company his prospectus. For a very reasonable $95,000, the scientist promised to help “stem the tide towards ever more onerous controls on energy use.”
His hook was ozone. The spray cans that had been phased out, Dr. Singer explained, “all on the basis of quite insubstantial science.”
So if funds were provided “without delay,” Dr. Singer could deliver: an event, a panel, and a round number — “a Statement of Support by a hundred or more climate scientists.” With the Singer specialty: “This Statement could then be quoted or reprinted in newspapers.”
I don’t know whether Dr. Singer ever secured his funding. But that November, a panel did convene: in Leipzig, Germany. And one year later, his Statement did appear: the Leipzig Declaration. With the promised one hundred signatures.
The names crinkled brows. (Harvard’s John Holdren, later science advisor to the Obama White House, wrote of them as a mirage or the dream you reconstruct over breakfast: the list “dissolves under scrutiny.”) Sleuths from Danish Broadcasting attempted to track down the 33 European signers. Four could not be located. Twelve denied signing or even knowing about any Leipzig Declaration. Three were offended to hear their names were associated with it. The Statement had also been signed by dentists, lab techs, engineers, and one off-course entomologist who landed briefly on the page.
But the Leipzig Declaration packed its bags and coast-to-coasted anyway — from the Wall Street Journal to the Orange County Register, migrating also to Canada, London, Scotland, Australia, New Zealand. “It is widely cited by conservative voices,” write journalists Sheldon Rampton and John Stauber. “And is regarded in some circles as the gold standard of scientific expertise on the issue.”
Dr. Singer identifed a hardy, Band of Brothers spirit among his “one hundred climate scientists.” As he explained in the Wall Street Journal, “It takes a certain amount of courage to do this.”
What it didn’t necessarily take was a degree in science. Florida’s Saint Petersburg Times ran their Leipzig story on the front page. Because (a) Florida, sea level. And (b), one signer was a local, the weather guy over at Tampa Bay’s WTVT. Who lacked “a Ph.D. in any scientific field,” the paper noted. “Or, for that matter, a bachelor’s.”
Dr. Singer had met his quota by reaching out to these sportscasters of the air. Twenty-five weathermen signed in, a big klatch from the state of Ohio. This included Richard Groeber, owner and operator of Dick’s Weather Service: you dialed his phone number and he told you the weather.
The Petersburg newshound dialed. Was Dick Groeber, he asked, really a scientist?
“I sort of consider myself so,” Groeber replied. “I had two or three years of training in the scientific area, and 30 or 40 years of self-study.”
The reporter brought his concerns to the keeper of the signatures, Dr. Singer. The scientist’s answer is a testament to the virtue of persistence, of keeping an eye fixed always on the prize. What was truly important, Dr. Singer said, was “the fact that we can demonstrate that 100 or so scientists would put their names down.”
And I wonder if it bothered Dr. Singer. If it’s the story of his outranked life. That for the Oregon Petition — the signature list that did go over the top — the push came from the bigger, better honored, more consequential Fred.
This article was excerpted from David Lipsky’s new book "The Parrot and the Igloo."Courtesy W.W. Norton
I don’t know who took care of the introductions. I do know S. Fred Singer sent Arthur Robinson — a biochemist, five-time Republican nominee for Oregon’s 4th congressional district, and the founder of the Oregon Institute of Science and Medicine, a privately funded lab — material to beef up the research paper that accompanied the Oregon Petition. And I know that the Marshall Institute —— founded by the other Fred, Dr. Seitz, the physicist and tobacco industry consultant Business Week once called the “granddaddy of global-warming skeptics” — dispatched two specialists, climate Sherpas, to lug and guide Arthur along the trickier science crevasses.
One of them was later exposed on the front page of The New York Times. Dr. Willie Soon had been the beneficiary of $1.2 million in fossil fuel largesse. The last of his dinosaur generation to find their way into the tar pits.
“In correspondence with his corporate funders,” the Times reported in 2015, Dr. Soon “described many of his scientific papers as ‘deliverables’ that he completed in exchange for their money.”
And then a beautiful single-sentence short story: capturing the whole project and spirit of denial. “Though often described on conservative news programs as a ‘Harvard astrophysicist,’ Dr. Soon is not an astrophysicist and has never been employed by Harvard.”
Arthur cowrote his paper with the two Dr. Seitz specialists, and a fellow member of the Oregon Institute faculty: his 21-year-old son, Zachary.
This father-son teamwork produced something strange. First, their paper said climate change would not occur. Then, somewhat unexpectedly, it reversed field and explained that the change was already in progress and accomplishing marvels.
Their concluding sentences drop the effort of science entirely. The language pans across streams and meadows — takes in a drowsy summer morning, with the sound of bees. “We are living in an increasingly lush environment of plants and animals,” the Robinsons write, a little dreamily, “as a result of the CO2 increase. Our children will enjoy an Earth with far more plant and animal life than that with which we are now blessed. This is a wonderful and unexpected gift of the Industrial Revolution.”
Arthur’s paper had never been published or peer-reviewed. It was entirely homeschool.
And here’s where you can appreciate the great, freewheeling advantage of having fun. Arthur Robinson and Frederick Seitz collaborated on a tremendous prank.
Arthur had his report professionally printed. Now this home-cooked meal, this sloppy Joe, resembled an entrée at the end of a Food Network episode. The National Academy of Sciences produces one of the world’s most distinguished journals. Garnishing with font and layout, Robinson labored until his blessing looked, in the words of the journal Nature, “exactly like a paper from the Proceedings of the National Academy of Sciences.”
Everybody has the one résumé line they lean on. It’s whispered before you sweep over to shake hands; it will lead the obituaries when you step away forever. Frederick Seitz was the former National Academy president — publishers of the Proceedings journal whose format Arthur had copied.
Dr. Seitz wrote the letter that accompanied the Oregon Petition.
The United States is very close to adopting an international agreement that would ration the use of energy. ... This treaty is, in our opinion, based upon flawed ideas. ...We urge you to sign and return the petition card.
Dr. Seitz signed with his résumé line: Past President, The National Academy of Sciences.
A cover letter from an Academy president. A paper formatted to look exactly as if it had been published in the Academy magazine. (Plus the plural we urge, the institutional in our opinion — the speaking voice of an organization.) Arthur and Seitz had pulled off the greatest soundalike in denial history.
The package was then sent all across America — as one researcher wrote, to “virtually every scientist in every field.” And how could recipients fail to believe, tearing open their envelopes, that the Academy was reaching out to them, at an hour of scientific need?
In 1996, Nature had written about the “dwindling band of skeptics.” You picture palm fronds and breakers, the shoreline from Lord of the Flies: a rocky atoll among rising seas.
This line vexed deniers. It so bugged S. Fred Singer he ascribed it, for ease of attack, to Al Gore. (The scientist loved to attack the vice president.). So the other aim of the petition: to grow the movement, at least in the eyes of key readerships in the Washington metro area.
It really was their weakness: Demographics. Max Planck once made an ice-eyed observation about scientific change. It doesn’t result from fresh evidence, or the Kevlar argument. Positions get too dug in for that. It steals on gradually, in calendars and gravesides. “A new scientific truth does not triumph by convincing its opponents and making them see the light,” the physicist wrote. “But rather because its opponents eventually die, and a new generation grows up that is familiar with it.”
The plain truth was the deniers weren’t getting any younger. Actual science was drawing the young PhDs. (When S. Fred Singer addressed a roomful of such climatologists in the spring of the Oregon Petition, the reception was not hostile. It was charity. His audience “politely pointed to datasets and to scientific research,” wrote science journalist Myanna Lahsen, “none of which Dr. Singer appeared to be familiar with.”) It’s why the great denial work was brought off by Frederick Seitz, 86, and S. Fred Singer, 78; and by Arthur Robinson, aged 56, whose footsteps two-time Nobel Prize laureate Linus Pauling had long ago banished from institutional hallways.
“What will happen is clear,” Arthur told supporters, in a sort of pre-invasion essay, as his envelopes mustered at the post office. “The warmers will be deprived of the central pillar that underlies their entire campaign.”
This was that tall, shade-throwing word: consensus. “Remove their facade of scientific consensus, and they will likely lose — if it is removed in time.”
And it worked. In the House and Senate, lawmakers said the petition proved climate change was “bogus” — a non-issue for “the vast majority” of scientists. (They needed something like it to be true. So they went ahead and believed it into truth.) It worked because it’s a big library, and we’re all busy people. And, as the bibliothecary Jorge Luis Borges once observed, “The person does not exist who, outside their own specialty, is not credulous.”
“Happy Earth Day, Al Gore!” Fred Singer wrote in his Washington Times column. “Your much-touted ‘scientific consensus’ on global warming has just been exposed as phony.” They’d finally found a way to bring down the tree.
In 2001, Scientific American went through Arthur Robinson’s signature books. Present on Arthur’s list were names submitted in a spirit of substitute-teacher abuse. (Arthur told the Associated Press that he had “no way of filtering out a fake.”) There was Shirl E. Cook and Richard Cool and Dr. House, and the presumably dependable Knight and the presumably less steady Dr. Red Wine, also the accommodating Betty Will, the in-terrible-distress W. C. Lust. Also someone who gave their name only as Looney. Plus a dash of celebrity like Michael J. Fox and John Grisham and the dramatis personae of the medical series M*A*S*H. Even some businesses, like R. C. Kannan & Associates, and Glenn Springs Holdings, Inc., had found a way to lift the pen and get involved. Dick Groeber — Dick’s Weather Service — had once again elected to lend the effort the weight of his endorsement. All these names appeared on Arthur’s petition as it was cited in Congress.
Arthur claimed only one false name was ever found to soil his list. (Some jokester had snuck on Dr. Geri Halliwell — Ginger Spice, of the empowerment band Spice Girls.) But post-media, all these names were quietly withdrawn. W. C. Lust and Betty Will and Glenn Springs Holdings, Inc., and Dick’s Weather Service, scrubbed from history.
The names Scientific American examined were real. Barrier to entry was not high. If you claimed a bachelor’s in math, science, or engineering, to Arthur’s way of thinking you were a climate scientist. (Even so, Dick Groeber had no real business being on this list.) Your kid’s math teacher could sign. So could her shop teacher, and the veterinarian.
These names were Styrofoam peanuts, packaging, and brushed aside. Scientific American took “a random sample of 30 of the 1,400 signatories claiming to hold a Ph.D. in a climate-related science.”
Of the 26 names they could identify through the databases, “11 said they still agreed with the petition.” The magazine went on, “One was an active climate researcher, two others had relevant expertise, and eight signed based on an informal evaluation. Six said they would not sign the petition today, three did not remember any such petition, one had died, and five did not answer repeated messages.” The magazine estimated that Arthur had managed about 200 climate researchers — “a small fraction of the climatological community.” Remove number from box, shake off the packaging: What Arthur Robinson and Frederick Seitz had delivered was a sweaty means of confirming the consensus.
And still there were international headlines (“NO SCIENTIFIC CONSENSUS ON GLOBAL WARMING”). And still Frederick Seitz and S. Fred Singer could make their use of the data.
Dr. Seitz told reporters the petition represented “the silent majority of the scientific community.” (Which meant at least 51 laconic percent.) And Dr. Singer called it “the largest group of scientists ever,” as if the petition combined a Caltech homecoming weekend with an especially congested Burning Man.
Arthur kept up the petition drive. Yet among supporters, he couldn’t quite bring himself to call the signers colleagues. The tongue values what it values.
“We’ve got now about 17,000 scien—” Arthur caught himself. “People with degrees in science.” As of 2008, he’d nearly doubled his figure.
S. Fred Singer experienced the same performance trouble. In 2012 he was still quoting it. Because it was the only thing — Arthur had given the movement the strongest evidence it ever had. But even the famously reliable Singer tongue went rogue. “There’s hundreds of us — thousands,” he said on PBS. “Look, 31,000 scientists and engineers signed a statement.” Then the scientist went a bit green. “Look, they’re not specialists in climate.”
But in 1998, when the ground was fresh, Dr. Singer told Congress that signers were “specialists in fields related to global warming.” He told readers, while the issue was being contested, they were “experts in the pertinent scientific fields.”
Arthur’s website gives his patriotic side of the figure. “31,487 American scientists,” he writes. “Including 9,029 Ph.D.s.” You needed a data point, a comparison.
So, for the doctoral number: America is home to half a million science and engineering PhDs. Arthur netted 1.8%. His yield was small. And for the bachelor’s number: We’ve awarded 10 million first degrees in science and engineering. Here Arthur’s petition was an absolute crash: 0.3%.
Arthur again sounded the Academy horn in a press release. “More than 40 signatories are members of the prestigious National Academy of Sciences.” But Arthur had withheld the comparison. The Academy’s got 2,200 members. His yield was eerily consistent: 1.8%. The generally accepted number for climate scientists and warming is 97% to 3%. Arthur’s fate was to spend 25 years as superintendent of a consensus he loathed.
This article was excerpted and condensed from David Lipsky’s book The Parrot and the Igloo: Climate and the Science of Denial, available now from W. W. Norton & Company ©2023.
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On Alaska’s permitting overhaul, HALEU winners, and Heatmap’s Climate 101
Current conditions: Kansas, Oklahoma, and Arkansas brace for up to a foot of rain • Tropical Storm Juliette, still located well west of Mexico, is moving northward and bringing rain to parts of Southern California • Heat and dryness are raising the risk of wildfire in South Africa.
The Trump administration has started the process to roll back logging protections from more than 44 million acres of national forest land. On Wednesday, U.S. Secretary of Agriculture Brooke Rollins proposed undoing a 25-year-old rule that banned building roads or harvesting timber on federally controlled forest land, much of which is located in Alaska. “Today marks a critical step forward in President Trump’s commitment to restoring local decision-making to federal land managers to empower them to do what’s necessary to protect America’s forests and communities from devastating destruction from fires,” Rollins said in a statement. “This administration is dedicated to removing burdensome, outdated, one-size-fits-all regulations that not only put people and livelihoods at risk but also stifle economic growth in rural America.”
Environmental groups slammed the proposal for jeopardizing wildlife habitats and putting waterways at risk. “Communities depend on clear water filtered by roadless areas, animals depend on the unfragmented habitat that can only exist where there are no roads, and anglers depend on clean water in the streams where trout and salmon swim,” Ellen Montgomery, the director of Environment America’s great outdoors campaign, said in a press release. “We cannot let these essential forests be carved up by roads, obliterated by chainsaws, and contaminated by mines.”
Heatmap’s new Climate 101 series aims, as Heatmap deputy editor Jillian Goodman explained, to be “a primer on some of the key technologies of the energy transition.” That includes “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.”
This might be especially helpful for those still trying to find their way into the climate conversation, but we hope there’s something here for everyone. For instance, did you know that contemporary readers might have understood Don Quixote’s “tilting at windmills” to be an expression of NIMBYism? Well, now you do!
The federal Permitting Council signed a first-of-a-kind memorandum of understanding to work together with Alaska’s government to streamline permitting on critical infrastructure projects across the state. First established in 2015, the agency was designed to improve transparency and speed up the greenlighting of infrastructure approvals. But it had yet to forge such a close pact with an individual state. “Our team is ready to work with Governor Dunleavy to bring Alaska back into the energy spotlight, ending the neglect of the Biden Administration and bringing Alaska’s incredible natural resources to the rest of the world,” Emily Domenech, the Permitting Council’s executive director, said in a statement.
Domenech — a former staffer for House Speakers Kevin McCarthy and Mike Johnson who went on to serve as a senior vice president at Boundary Stone, a firm founded by alumni of the Obama-era Department of Energy — acted as something of a Republican sage for the clean energy industry. In an interview with Heatmap’s Matthew Zeitlin after last November’s election, she urged the industry to forge closer relationships with members of the current congressional majority. “If you ask Republicans to be for or against the IRA as a whole, they’ll be against it,” Domenech said, “But Republicans think about energy as a regional issue. So instead of forcing this one size fits all approach, IRA advocates would be smart to give people room to support only the policies that make the most sense for their state or region.”
The Department of Energy selected another three companies to receive a special kind of nuclear fuel from its growing stockpile. HALEU — pronounced HAY-loo, an acronym for high assay low enriched uranium — is a reactor fuel enriched up to four times as much as traditional reactor fuel. The fuel is needed for all kinds of novel reactor designs, particularly those that use coolants other than water. Until recently, however, Russia’s state-owned Rosatom had enjoyed a virtual monopoly over its global supply. The Biden administration set aside billions for HALEU production. In April, the Trump administration selected five companies to receive some of the government-procured supply, including Westinghouse, Bill Gates’ TerraPower, and the Google-backed Kairos Power. Now the agency has picked another three:
Two firefighters battling the Bear Gulch fire on Washington’s Olympic Peninsula were arrested by federal law enforcement Wednesday. The reason for the arrests is unclear, according to the Seattle Times. Over three hours, federal agents from Border Patrol carried out an “operation on the fire,” demanding identification from members of two private contractor crews who were among the 400 firefighters battling Washington state’s largest active blaze. The Incident Management Team from the National Interagency Fire Center suggested that the action did not interfere with the efforts to tamp down the flames.
The American West is primed for wildfires right now. Following a lull in June and July, Heatmap’s Jeva Lange wrote that “the forecast for the Pacific Northwest for ‘Dirty August’ and ‘Snaptember,’ historically the two worst months of the year in the region for wildfires,” was full of warning signs, including low precipitation and abnormally high temperatures.
Living, gnawing weedwackers.Vesper Energy
The 1.36 million solar panels at Vesper Energy’s Hornet Solar farm in Swisher County, Texas, one of the United States' largest single-phase solar projects, were overgrown with vegetation. So naturally, the company brought in sheep. More than 2,000 white, wooly ovines arrived this month and were allowed to roam the facility’s six square miles. “As Texas continues to lead the nation in solar energy growth, solar grazing highlights how innovation can support rural economies, preserve farmland, and strengthen the state’s reliable energy future,” Vesper said.
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.