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What happens to the grid when the sun goes away?

Early April is typically a kind of goldilocks moment for solar power. Days are getting longer but the weather is still mild, meaning that higher solar power generation isn’t entirely eaten up by increased demand due to air conditioning.
But that all depends on the sun actually shining.
Monday’s solar eclipse took a big chunk of power off the grid. Since 2017’s eclipse, solar power generation has increased substantially, both locally (think rooftops) and at utility scale (think massive fields of solar panels). In 2017, the U.S. had around 35 gigawatts of utility-scale solar capacity, a figure that had increased to an estimated 95 gigawatts by the end of 2023.
While total solar eclipses are rare (the next one to hit the lower 48 isn’t expected until 2044), the challenges they present to grid operators may be part of the new normal. With vastly expanded renewable energy generation comes a greater degree of unpredictability, as a growing a portion of the generation fleet can drop off the grid due to weather and climate conditions — like, say, clouds of smoke from a wildfire — that cannot be precisely predicted by 17th century science.
Grid operators were confident they’d be able to manage through the eclipse without any reliability issues, and what actually transpired mostly confirmed their forecasts. In Texas, solar power production shrunk from around 13.5 gigawatts at noon, making up 27% of the grid’s electricity supply, to a mere 0.8 gigawatts at 1:30 p.m. Things did not go as well for the Midcontinent Independent System Operator, however, which includes a swath of the middle of the country from Minnesota to Indiana to Louisiana. Solar output was estimated to drop from around 4 gigawatts at 1 p.m. Central time to 2 gigawatts an hour later, according to Grid Status. Instead, output dropped to around 300 megawatts, causing real-time prices for power on the grid to spike.

Overall, the U.S. Energy Information Administration estimated that some 6,500 megawatts of solar generation capacity would be fully obscured during the eclipse, which would “partially block sunlight to facilities with a combined 84.8 GW of capacity in an even larger swath of the United States around peak solar generating time.” Some 40 gigawatts may have come off the grid, enough power for about 28 million homes, according to a release from Solcast, a solar forecasting company.
By comparison, during the 2017 eclipse, solar power loss at its peak was between 4 and 6.5 gigawatts and the total loss of power was around 11 gigawatts, according to the National Renewable Energy Laboratory.
In states like Texas, the main effect was on utility-scale production of solar, but in the Northeast and parts of the mid-Atlantic and Midwest, there was also a related problem: Behind-the-meter solar fell off, too, thus requiring the homes and businesses that generate power for themselves in the middle of the day to get more power from the grid, increasing demand on the grid at a time of low supply.
New England has seen immense growth in rooftop solar, and solar production was expected to fall by “thousands” of megawatts, according to ISO New England, while the New York Independent System Operators expected to lose 700 megawatts of behind the meter solar.
During the 2017 eclipse, the National Renewable Energy Laboratory found that “the burden of compensating for the lost energy from solar generators fell to the thermal fleet,” i.e. natural gas, along with some increases in coal and hydropower production.
Since then, the coal fleet has shrunk, thus putting more of the burden of responding to Monday’s eclipse onto gas and hydro, but the basic logic still applies. “Grid operators are expected to rely on natural gas to ensure stability and meet the household demand spike across national grids, as was done during the previous eclipse in 2023 in California and Texas,” according to Solcast. As the sun was dimming in Texas, natural gas generation rose from 18.7 gigawatts to 27.5 gigawatts.
Something else that’s changed since 2017: batteries. By the end of 2023, Texas had installed 5.6 gigawatts of grid storage, most of it providing so-called “ancillary services,” power sources that can respond quickly to immediate needs. ERCOT, the electricity market that covers most of Texas, said in a presentation back in February that it would rely on these ancillary tools to get through the eclipse, and once again, it was right. Power from batteries on the grid got up 1.4 gigawatts during the eclipse.
Editor’s note: This story has been updated to reflect the actual effects of the eclipse on U.S. power generation.
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After taking two seats in a special election last year, the party gained a third in the midterms.
Democrats claimed two seats on the Georgia Public Service Commission in a special election last year, ending almost 20 years of unanimous Republican control over the regulator.
One of those winning Democrats, Peter Hubbard, ran again this year for a full six-year term in a rematch against Republican Fitz Johnson. The other open seat this year saw Sheila Edwards running in an open race against Republican Josh Tolbert.
Both Hubbard and Edwads won, securing a 3–2 Democratic majority on the Public Service Commission.
“Over the last 12 months, Georgian consumers have made one thing clear: They are tired of rising utility bills and they are hungry to see change. Georgia’s sea change moment for energy policy has arrived,” Charles Hua, the executive director of the utility-focused advocacy group PowerLines, told me.
The Democrats have not been shy about what their priorities will be on the commission.
“Winning control of the Georgia Public Service Commission means prioritizing lowering power bills instead of constantly increasing corporate profits, ramping up the deployment of clean energy technologies, and focusing the people in our decision-making as state regulators,” Hubbard said in a statement on his website.
Edwards, for her part, made it clear where she stands on data centers specifically in an October debate with Tolbert. “They came into our communities,” Edwards said. “They didn’t pay any taxes. They are using our water, using our electricity, and they’re being a public nuisance to the communities that they’re coming into.”
Hubbard also talked about data centers on Heatmap’s Shift Key podcast back in June. “I advocate for a whole-of-government approach, because while the Public Service Commission really only has oversight over the power side of things — where that power comes from and how much data centers are paying on their tariff — there’s much larger issues in terms of water use, in terms of the tax incentives,” he told my colleague Robinson Meyer. “The estimate is $3.5 billion in tax abatements this year in Georgia, uncollected revenue that data centers otherwise would be willing to pay.”
The race has seen outsize spending and interest from major figures not accustomed to dealing in utility regulator races. (Just 10 states have elected utility commissions, period.) Kamala Harris appeared at a virtual fundraiser for the Democratic candidates in Georgia, as well as Democratic hopefuls to the Arizona Corporation Commission. The solar energy industry spent hundreds of thousands of dollars in support of the Democrats in Georgia. Meanwhile, anonymous donors pumped millions of dollars into Tolbert’s bid.
Democrats swept into the Georgia PSC last year on a wave of dissatisfaction with rising electricity prices, especially rate hikes attached to the construction of two new nuclear reactors at the Vogtle Electric Generating Plant, which ran years behind schedule and billions of dollars over budget. In the runup to the election, the PSC approved a three-year base rate freeze proposed by Georgia Power in an attempt to head off public dissatisfaction.
In the past year, rates in Georgia have gone up by less than 1% across the state on average, according to the Heatmap-MIT Electricity Price Hub, while rates are up over 18% in the last three years and over 6% in the past two years.
Shares in Southern Company, the parent company of Georgia Power, were down slightly more than 0.5% in after-hours trading Tuesday night.
Restoring renewable tax credits and investigating Energy Department funding cuts are on the table.
The United States is set for a divided government for the first time since Donald Trump’s return to the White House last year. Voters across the country overwhelmingly cast ballots for Democrats, handily securing the party’s control of both the House of Representatives and the Senate. The victory came hours before polls closed in the nation’s westernmost reaches as Democrats flipped seats held by the GOP for decades in states such as Georgia, South Carolina, and Texas.
It was a seismic national shift to the left, spurred in no small part by voters’ opposition to infrastructure supporting artificial intelligence and anger over rising gas and electricity prices, particularly since Trump launched a war on Iran.
In an election widely seen as a referendum on Trump, Democrats trained their fire on the administration’s energy policies. Those include its moves to eliminate landmark climate regulations, its oversight of the U.S. buildout of data centers, its legally dubious deals to kill offshore wind farms, and repeals or redirections of funding for decarbonization.
Much of what the next Congress focuses on when it comes to energy policy hinges on what happens with the Bipartisan American Affordability and Jobs Act, the permitting reform bill that has dominated Washington dealmaking discussions since the Senate unveiled the legislation at the end of September.
But key provisions in two of the most significant energy laws enacted in the past six decades — the Infrastructure Investment and Jobs Act of 2021, better known as the Bipartisan Infrastructure Law, and the Energy Act of 2020 — have either expired or are set to lapse next year. Reauthorizing the bipartisan measures in both laws will offer a new, Democrat-led Congress the chance to push legislative priorities such as bringing back key subsidies for renewables in a bid to rebalance the country’s energy future following Trump’s AI-fueled gas bonanza. Candidates who flipped districts that previously voted for Trump also vowed to crack down on data centers, which strongly suggests that the party will back legislation to curb the artificial intelligence buildout.
Among the top policies Democrats plan to champion next year on clean energy is the restoration of the investment and production tax credits for wind and solar, which Republicans axed in their signature budget bill last summer.
“There’s broad recognition and an active effort by Democrats to reinstate many things done away with in the One Big Beautiful Bill Act,” Evan Chapman, a former Democratic staffer on the Hill who now serves as the senior director of policy at the think tank Clean Tomorrow, told me.
Bringing back the electric vehicle tax credit? Not so much. The provision in the 2022 Inflation Reduction Act gave a far larger write-off for cars made with batteries manufactured with domestically-produced minerals, giving a much-needed boost to U.S. miners. Yet the policy proved difficult to defend against populist anger over its benefits tilting largely toward wealthy drivers who bought electric vehicles as a second or third car.
The EV tax credit was another OBBBA casualty. Without that market signal, it seemed unlikely that all the decades-long mining and minerals projects proposed in the U.S. would find investors, illustrating what my colleague Matthew Zeitlin last year called the “paradox of Trump’s critical mineral crusade.”
But a battery boom is underway nevertheless, as large, standalone lithium-ion packs increasingly patch onto the grid to balance out supply over time, particularly in markets that generate a lot more solar and wind during the day than anyone can use.
“Batteries generally are an area of more and more confluence every day between Democrats and Republicans,” a source with direct knowledge of Democrats’ thinking who spoke on condition of anonymity to speak bluntly told me. “It’s unclear what anyone wants to do. Republicans don’t want to do more EV tax credits, but it could be a battery production tax credit that’s technology neutral.”
Asked whether such a policy could win GOP support, James Dozier, the chief executive of the Republican climate group Citizens for Responsible Energy Solutions, told me that anything that would boost domestic mineralsrepresented an area of broad agreement between the two parties. The Trump administration has strongly supported domestic mining and mineral processing as China retaliated against the president’s trade war by cutting off supplies of metals needed for weapons and batteries.
“Battery technology should be invested in,” he said.
Other bipartisan priorities with a high likelihood of legislative success include federal funding for or regulatory changes to make it easier to deploy geothermal energy, fusion, and nuclear fission.
Another top issue is the expansion of the Department of Health and Human Service’s Low Income Home Energy Assistance Program. Known as LIHEAP, the roughly $4 billion program provides funding to poor Americans struggling to pay utility bills in the winter. The program, administered through states, also funds home renovations to better insulate drafty houses and lower bills, offering a key tool to make good on Democrats’ promises to help rein in soaring utility costs. While Trump has proposed eliminating the program’s funding almost entirely, Congress ultimately added $20 million to LIHEAP’s budget in the last cycle.
The Democratic caucus is poised to include far-left hardliners such as New York’s Darializa Avila Chevalier, whose energy proposals range from a nationwide ban on data centers to calling on the federal government to take ownership stakes in more wind and solar projects. But the larger the Democratic majority, the less power the ideologues on the fringes can wield, Josh Freed, who heads the energy and climate program at the centrist Third Way think tank, told me.
“If Democrats get anywhere close to 230 seats, there’s going to be both a much bigger bloc of New Democrats and moderate Blue Dogs than there is in this Congress,” Freed said. “You’re going to see an agenda much more oriented around delivery and affordability than anything that’s more ideologically rooted.”
For example, he said, progressives may push for a national moratorium on data centers or a freeze on utility rates. “Those are things that won’t pass, but that you might see a handful of members who have a lot of leverage in a very narrow House try to move forward, along with Medicare for All and other issues that are dealing with energy,” Freed said. “But the more seats Democrats have, the more seats you’ll have that represent rural, energy-producing, and blue-collar constituencies. It’s going to be a much more all-of-the-above focus.”
The potential to pass bipartisan policies through a divided government over the next two years doesn’t mean it’s all kumbaya on the energy and climate front. Newly-enthroned Democratic committee chairs in the House are expected to hold hearings and open probes into a variety of actions by the Trump administration.
Few cuts at the Department of Energy stung quite as painfully as the Trump administration’s decision to terminate the Industrial Demonstrations Program, a $6.3 billion initiative designed to help commercialize emerging technologies to clean up heavy industry. The program funded 29 projects in its initial round, but former officials told me last year that just three looked likely to survive the Trump administration’s cuts. Meanwhile, the Chinese government expanded its own version of the program to more than 100 projects. Expect Democrats to start asking questions.
The billions of dollars in deals the Trump administration has promised to companies that surrender their federal leases for offshore wind projects are already facing legal challenges as states such as New York and California advance lawsuits. These policies are also poised for congressional oversight.
Likewise, the Energy Department’s effort to redirect federal spending earmarked to support decarbonization is ripe for a probe by Democrats. Specifically, lawmakers are expected to query the agency’s use of a $500 million grant to steelmaker Cleveland-Cliffs to support the relining of a coal-fired blast furnace at its Ohio mill rather than the construction of cleaner iron-making equipment at the plant.
One more area set to draw scrutiny is Trump’s move to bring previously independent agencies — the Nuclear Regulatory Commission and the Federal Energy Regulatory Commission — under direct White House control.
“There’s going to be a lot more demand that these independent agencies regain their independence,” Paul Dickman, a former nuclear regulator who served in the George W. Bush and Obama administrations, told me. “Be that FERC, be that the NRC.”
In a statement late Tuesday night, the Sierra Club said its members had “organized, phonebanked, and knocked doors for these candidates up and down the ballot,” and now expected Democrats to “take ambitious action for the climate and our democracy.” The latter, the group made clear, meant going after the White House.
“They must hold the Trump administration accountable for its corruption and unlawful attempts to sacrifice the health and safety of our communities,” Sierra Club Executive Director Loren Blackford said, “and invest in a clean energy future for all of us.”
Editor’s note: This story has been updated to reflect the change in Senate control.
Current conditions: The polar vortex that keeps air circulating around the North Pole collapsed months ahead of schedule, threatening to send frigid temperatures southward • India’s east coast Andhra Pradesh state is facing down yet another major storm as Severe Cyclone Murasu makes landfall • The catastrophic atmospheric river over the American Southwest has dumped more than 20 trillion gallons of water across Arizona, Colorado, New Mexico, and Utah.
The average price of a gallon of gasoline during President Donald Trump’s second term topped $3.46 as of Monday, a record that exceeds the previous high set under the Biden administration. That’s according to a new analysis by the Financial Times. And that’s just the average across the past 22 months. The average price nationwide on November 2 clocked in at just under $4.17 per gallon. “If modern living boiled down to a price, it’s the price at the pump,” Bob McNally, a former energy advisor to the George W Bush administration and president of consultancy Rapidan Energy, told the newspaper. “Whether a voter is filling up that day or not, it’s likely that they see a pump price.”
Oil prices, meanwhile, plunged Monday on hopeful signals from Iran about potential progress in peace talks to end the war with the United States. West Texas Intermediate, the U.S. benchmark, fell nearly 8% to $96 per barrel. Brent crude, the global measure, dropped over 8% to $104 per barrel. Murban crude, the stuff that flows out of the United Arab Emirates and therefore faces the worst impacts from Tehran’s attacks on tankers exiting the Persian Gulf through the Strait of Hormuz, dove over 11%.
When energy researcher (and now Google wonk) Tyler Norris came out with his landmark paper last year arguing for data centers that can flexibly respond to conditions on the grid, my colleague Matthew Zeitlin quipped that the policy amounted to “one weird trick to get more data centers” online. ChatGPT-maker OpenAI is now making that trick routine. On Monday, the company announced its “grid protectors program,” under which it plans to make all the data centers serving its artificial intelligence software responsive to the grid wherever they’re located. That way, rather than drumming up neighbors’ concerns over power prices and blackouts, data centers are welcomed as assets that keep the lights on. “Power lines, substations and other grid infrastructure builds are a fixed cost whether demand is low or high,” the company said in a post on its website. “By using more electricity when the grid has room and reducing our use when it is under strain, we can help pay for that infrastructure while limiting the need for costly upgrades to meet peak demand. That can help keep costs down for other customers.”
When the Environmental Protection Agency rescinded its plans to restrict how much carbon dioxide U.S. power plants can emit, the Trump administration argued that shutting down the coal- and gas-fired stations that supply most of America’s electricity “would have no more than a trivial effect” on health outcomes due to climate change. But a lengthy new formal comment co-signed by eight of the largest mainstream green groups in the country said the EPA “misinterprets the Clean Air Act, ignores scientific evidence, and entirely misunderstands its own duty as the agency responsible for protecting public health and the environment,” and accused the agency of using its flawed approach as the basis for a “tectonic and unreasoned policy shift.” The remarks, which the Natural Resources Defense Council shared exclusively with me for this newsletter, was endorsed by a range of groups that includes the Clean Air Task Force, the Center for Biological Diversity, Earthjustice, Environmental Defense Fund, Sierra Club, and the Union of Concerned Scientists.
As part of the 271-page comment, the groups submitted a new analysis that projected emissions from U.S. power plants to cause $20.4 trillion in health-related damages by 2100. That’s nearly equal to the entire U.S. gross domestic product in 2024. “We present our own modeled scenarios, which illustrate the gravity of EPA’s technical errors and the sensitivity of the agency’s findings to inputs and assumptions,” the group wrote. “Under our alternate illustrative scenarios, U.S. power-plant emissions’ impacts on global temperature and sea level rise easily exceed EPA’s alleged de minimis thresholds, showing such impacts are in fact meaningful even under EPA’s flawed futility methodology.”
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A mining company with ties with two of Trump’s sons is preparing to go public. On Monday, The Wall Street Journal broke news that Kaz Resources plans to start selling shares next year through a direct U.S. listing after giving Donald Trump Jr. and Eric Trump a stake in a major tungsten project in Kazakhstan. The venture, a partnership with the Kazakh government, is part of a broader effort through Cove Capital, a mining prospector led by Australian-American executive Pini Althaus, to expand U.S. mineral deals in Central Asia. Originally, Althaus planned to bring Kaz Resources public through a special purpose acquisition company, or SPAC. But Althaus abandoned the SPAC deal Monday in favor of a direct listing. The move is likely to draw scrutiny after today’s election. “I would be surprised if we weren’t,” Althaus told the Journal. “There’s no smoking gun here.”
Meanwhile, Graphite One, a startup that has won over $2 billion in funding from the Export-Import Bank of the U.S., took a big step forward. On Monday, the company said the Ohio Environmental Protection Agency had issued the final air permit for its debut anode factory in the state. “Receiving the final Ohio air permit is an important step toward establishing a domestic synthetic anode material supply chain,” Graphite One CEO Anthony Huston said in a press release. “This approval advances Phase 1 plant toward first revenue and supports our goal of becoming the first U.S. company commercially producing synthetic graphite anode material.”

Nearly all major U.S. automakers are urging Congress to enact a permanent ban on Chinese vehicles when lawmakers reconvene next week for a short session following the midterm elections. On Monday, Reuters reported that a bipartisan group of Senators met in September to discuss fast-tracking a bill, but decided to hold off until after the November election. “We need to protect the U.S. market from a flood of Chinese imports that carry surveillance risk and disadvantage current manufacturers that have made generational investments in American communities,” John Bozzella, who heads the trade group Alliance for Automotive Innovation, told the newswire.
Detroit automakers may have been slow to take electric vehicles seriously. But the narrative around one of America’s biggest homegrown success stories, Rivian, may be focused on the wrong vehicle. While the California-based manufacturer’s R2 electric sports utility vehicle attracts attention, its humble commercial van — the one popularized by Amazon — “is turning into a secret weapon,” according to InsideEVs. The company’s latest earnings suggest the van is becoming a significant revenue driver.
The country’s largest utility will spend up to $7 billion on a battery buildout. Exelon, the largest U.S. regulated electric and gas company in the country, with six utilities serving 11 million Americans, plans to spend up to $7 billion to build as much as 3.5 gigawatts of battery storage. In an earnings call last week, the utility giant said that it is spending a minimum of $3 billion for at least 1.5 gigawatts of storage. “With regulated storage, we have certainty that projects get built, and control over when and how they’re deployed,” Robert Kleczynski, Exelon’s CFO, said during the call, according to Utility Dive. “We view utility-owned storage as one option alongside competitive development, not a replacement for it.”