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Sweltering heat and earlier sunsets are a big problem for solar power.
The biggest problem in renewable energy goes by a few names.
Classically, it’s called the “duck curve,” which shows the relationship between solar generation and how much power the rest of the grid uses during the day. At the bottom of the curve, typically around midday, solar can sometimes generate 100% of the power demanded from the grid. But as the sun traces its arc towards the horizon, solar power generation falls and then quickly goes to zero as the sun sets. Often, temperatures and electricity use remains high, especially as people come home from work and start using home appliances, meaning non-solar sources of power must quickly come on line to fill in the gap.
It’s not a coincidence that utilities and grid operators tend to ask consumers to conserve in the later afternoon or evening. The phenomenon is classically associated with solar-heavy California, but it has come to Texas as well, where it goes by the name of the “Armadillo Curve” or the “Dead Armadillo Curve.”
But the relation between the sun and the Earth doesn’t just create darkness and light on daily scales but on annual ones as well. Yes, I know this isn’t breaking news, but it’s important, especially as the power system and climate are changing.
Right now we might be in the neck of the annual duck curve.
In case you haven’t noticed, the sun is setting earlier and it’s still really hot out. Kids are going back to school while much of the country is still facing summer temperatures.
In New York City this week, high temperatures are forecast to get into the 90s, while the sun will set before 7:30; in Washington, D.C., forecast highs are over 100 later this week with a sunset just past 7:30; in Houston, daytime highs to get over 100 later this week, with the sun setting before 7:40; and in Los Angeles , sunsets are at around 7:15 with expected daytime highs in the 90s this weekend.
And Septembers are only getting hotter. Septembers 2021 and 2022 were tied for the fifth hottest on record for the last 143 years, according to the National Oceanic and Atmospheric Administration; 10 of the hottest Septembers have occurred since 2012. The warmest was in 2020.
These higher temperatures mean prolonged periods of high electricity usage, even as one resource — solar — becomes less potent. This matters because, at least in the United States, we tend to organize our lives — and our electricity usage — around the clock, not the sun.
As the sun is setting earlier, our high electricity usage stretches longer compared to the length of the solar day, exacerbating the duck curve dynamics inherent to solar power. A dishwasher that runs when the sun’s still up in July is pulling the same power from the grid as one that runs during fall’s early twilight. The saving grace of shorter days in a grid that uses solar power is supposed to be that air conditioning usage goes down, but that doesn’t happen when summer temperatures persist past Labor Day.
If hot Septembers and even Octobers become the norm, grid conditions could tighten up both during and across the days, with higher cost, less reliable power or increased usage of fossil fuels to fill in the gap.
These longer, hotter summers can make operating electric grids more difficult. ERCOT, the electricity market that covers the vast majority of Texas, restricts power plants from having planned outages between May 15 and September 15 for maintenance. While still in the summer restriction window, ERCOT on Tuesday issued an alert for later this week, warning of “forecasted higher temperatures, higher electrical demand, and the potential for lower reserves.” If ERCOT extends its restrictions on outages for maintenance, there should be more unplanned outages, making power scarcer, meaning higher prices and a greater possibility of blackouts.
Not every country sees peak electricity usage in late summer. In New England, peak electricity demand tends to hit in July. In the sprawling PJM Interconnection last year, the electricity market that spans from the Chicago area to Virginia, demand peaks tended to be in June or August. In New York, peak demand is often in July.
But summer peaks are later in the year in two the country's largest electricity markets: California and Texas.
The Texas energy market had hit its peak day in July in 2022, but it moved out to August this year. And Texas is already bursting through its September demand records. It reached over 78,000 megawatts in just the first week of this month, well over its previous record of 72,370 megawatts, which it set in 2021.
And California hit its power demand record last September amidst a heat wave that covered much of the western United States.
It’s not just there being literally fewer hours of sunlight that drags down solar production later in the year, but also the lower angle of the sun. “As the sun gets lower in the sky we see solar production numbers will drop,” Joshua Rhodes, a senior research scientist at the University of Texas, told me.
“As the sun is lower in the sky it’s up fewer hours ... the photons are coming in at a steeper angle, the panels are not going to get as much light. Even when the sun is at the highest point of the day, the panels are not getting the same level of irradiance as when the sun is at the highest point of the day [at other times of year].”
The best angle for solar panels can change around 15 degrees a year, depending on the year and solar panels are more efficient when they can track the sun during the day. Most homeowners who install solar panels won’t have tracking technology, while utility-scale solar developers are more likely to. This means that a state like Texas, whose renewable mix is more focused on large solar arrays, could see less dramatic drop-offs in solar power throughout the day or throughout the year than a state like California, which has more residential solar.
A roof-mounted four kilowatt-hour solar PV system with standard specs where I grew up in Northern California would get 7.45 kilowatts-hours per meter squared per day in July, generating 689 kilowatt-hours of power, according to National Renewable Energy Laboratory PVWatts tool; in September, solar radiation would drop down to 6.6 kilowatt-hours per meter squared per day and 587 kilowatt-hours per month.
This admittedly basic math suggests it's possible California could struggle this month — and in future Septembers — with meeting electricity demand.
In the past 10 years, California’s annual load peak has occurred in September five times, with the peak loads in 2022 and 2021 occurring on September 6 and 8 respectively.
This year has been, so far, not particularly stressful for the Golden State’s grid thanks to some good luck — no region-wide, prolonged heat waves that max out California’s grid and make imports scarce, mild temperatures on the coasts where the state’s population is concentrated, no major wildfires, and plentiful hydro power thanks to massive snowfall this past winter — as well as massive deployment of batteries across the grid. The batteries especially can help alleviate these duck curve dynamics, as they essentially redistribute power from the sunniest part of the day to the evenings.
While Texas set several new records this year in electricity usage, California has stayed well short of its 52,000 megawatt record last September. California set records for solar power in June and July, with almost 16,000 megawatts, while total demand over 40,000 megawatts.
“While we haven’t seen substantial stress on the grid this summer, we haven’t been fully tested. If we got the kind of west-wide heat we experienced in September 2022, we could need to tap into the state’s emergency or strategic reserves again,” Anne Gonzales, a spokesperson for the California Independent System Operator, told me in an email.
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There used to be five employees overseeing the DAC hubs program. Now there’s just one.
Grant Faber suspected his short tenure as the program manager for the Department of Energy’s direct air capture hubs initiative was up when he saw an article circulating that the department was set to terminate up to 2,000 employees — generally those who were new to their jobs. When he hadn’t received any news by the end of the day on Thursday, February 13, he told me he felt a sense of “anticipatory survivor’s guilt.” But it wouldn’t last long.
“I woke up Friday morning and I was locked out of all my systems, and I had to get my termination letter emailed to my personal email address,” Faber told me. “It more or less just said it’s in the public interest to do away with your job.”
President Trump's campaign to fire federal workers has hollowed out the DOE's nascent Carbon Dioxide Removal team, which sits within the Office of Fossil Energy and Carbon Management. When Trump first took office there were five employees on the CDR team, which helps to oversee implementation of the $3.5 billion Regional Direct Air Capture Hubs program, Faber told me. Now, he said, there’s only one left.
Trump’s layoffs targeted probationary employees, i.e. those who had been hired, promoted, demoted, or reassigned within the past one to two years, who enjoy fewer job protections than those with longer tenures. Faber had been at his job for 11 months. His former boss, Rory Jacobson, was also terminated a few weeks ago, as he’d recently been promoted to a new role as director of carbon removal at the DOE. “To my knowledge, this was not about terminating people that were doing DAC work, or climate work, or even CDR work,” Jacobson told me. “This was just a gross termination of federal employees, career federal employees across the federal government that were on probation.”
But the cumulative effect of these layoffs certainly increases the air of uncertainty around the DAC hubs program, which thus far include two large-scale projects — the South Texas DAC Hub and Louisiana’s Project Cypress — as well as 19 smaller hubs in earlier stages of feasibility and design development.
The various hubs’ commercial partners, which include universities, oil giants, and DAC startups themselves, were already mired in the limbo created by Trump’s Day One executive order, which froze funding from the Inflation Reduction Act and the Bipartisan Infrastructure Law. That order also led to an effective communications embargo, which prohibits the DOE from discussing or taking action on things such as contract negotiations or personnel decisions with its external partners. These recent terminations just add to the confusion.
“We’ve had no communications with DOE for three to four weeks now,” the lead of one DAC hub in the feasibility study stage told me. “So we’re kind of just waiting to see what they tell us to do.”
In the meantime, awardees are frustrated and unsure where to turn, Jacobson told me. “Should they reach out to their congressperson and try to get them to advocate on their behalf? Do they send a letter to the White House? What is the next step to try and make things move for their projects?” These doubts pose a big problem for startups with novel technologies trying to build out large infrastructure projects, as they generally have smaller margins, less patient investors, and thus less room for error than industrial stalwarts with proven strategies. “Especially for these first-of-a-kinds, they are working on pretty dire timelines for project finance,” Jacobson said.
The DAC hubs were already off to a slow start, according to Jacobson, who told me that the $1.2 billion from the initial funding opportunity issued at the end of 2022 took much longer to get out the door than anyone hoped for. Project Cypress didn’t see any of its initial $50 million award until March of last year, and the South Texas hub had to wait until September for the same funding. Jacobson chalked up the delays to the fact that the awardees are generally relatively early-stage startups that have yet to build significant infrastructure projects, and that the DOE is unfamiliar with negotiating such large-scale proposals.
Thankfully the DOE’s small CDR division isn’t the only government entity interfacing with the DAC hubs. The Office of Clean Energy Demonstrations is overseeing the buildout of the larger South Texas and Project Cypress hubs. And the National Energy Technology Laboratory is overseeing the implementation of the smaller DAC hubs, which are in the feasibility study and design planning stages. They’ve received a combined total of $121 million so far, though some are still negotiating the size of their awards.
OCED and NETL have also been impacted by the government-wide staffing cuts, however, potentially affecting their ability to pick up the slack from the decimated CDR team, which helped to provide top-level oversight and expertise. As Jacobson told me, his job was to “make a theory of change” that united the DOE’s various carbon removal initiatives, aligning them with the administration’s overall energy strategy, whatever it was. Absent this broader vision and explicit strategic direction, coordination among the various government agencies and implementation partners could suffer.
Day-to-day organizational details also stand to falter, Faber told me. In his role, he primarily provided oversight for the 19 smaller, earlier stage DAC hubs. “A lot of times, progress can come down to literally just things like getting signatures, getting approvals, communicating things to leadership back and forth,” he said. “If you don’t have a team in place coordinating those things at headquarters, everything’s just going to be more difficult.”
All that’s to say that further hold-ups could hit the hubs hard, especially the two large projects, which could eventually receive federal funding of up to $500 million to $600 million, provided the hubs can match that with funding from other sources. “If the DOE tries to back out or withholds funding and there’s uncertainty, then yes, it could severely delay or even kill some of those projects, or just result in massive reductions in their scope,” Faber told me. Perhaps other investors, such as climate tech VCs, would be willing to step in if this were to happen, he added.
Faber noted that one proof point that could give investors and other industry leaders confidence in this tech is the forthcoming large-scale DAC facility called Stratos from developer 1PointFive, a subsidiary of Occidental Petroleum, which is designed to remove up to 500,000 metric tons of CO2 annually and set to come online later this year. While Stratos is not a part of the hubs program, Occidental is using the same technology for its South Texas hub — tech that the oil giant brought in-house when it acquired DAC startup Carbon Engineering in 2023. And Heirloom, a DAC company that’s helping to lead Project Cypress, also recently raised a huge $150 million Series B round, showing continued investor confidence in this technology.
The DAC hubs program also still has billions of dollars yet to be awarded. A few months ago, the DOE announced a new $1.8 billion funding opportunity for mid- and large-scale DAC projects. Interested parties have already submitted their required concept papers and pre-applications, with full applications due at the end of July. But the current chaos puts applicants in a tricky spot, as the new administration’s commitment to the program overall is now somewhat of a question mark.
That being said, Jacobson told me there’s no indication that either Trump or Secretary of Energy Chris Wright is necessarily opposed to DAC, or carbon dioxide removal overall. “I still don’t think that we’ve seen a clear signal that this administration is not excited about CDR,” Jacobson said. “I have not heard Secretary Wright say — or other leadership at DOE say — that we are not still very enthusiastic about DAC hubs.”
DAC buildout also has an array of bipartisan benefits, both Jacobson and Faber noted, and hasn’t been a target of right-wing ire in the way that electric vehicles and offshore wind have. On the contrary, Republicans (and oil and gas companies) often argue for it as a way to continue fossil fuel production in a world that’s moving towards lower-emissions sources of energy. Not to mention the fact that these DAC facilities are mainly being built in red states, thus adding jobs and GDP in these regions.
“I thought these kinds of projects would get to keep going,” the DAC hub leader, whose project has had elements halted, told me. “They’re creating jobs, they’re investing in technology. I think they could be well aligned with unleashing America’s energy dominance.”
But these days, few Biden-era initiatives are safe. As Faber told me, if the Trump administration chooses to take a hard line stance against “any and all government funding and regulation, and anything that even has a tinge of being associated with climate,” then DAC is going to have a target on its back, even if some congressional Republicans have previously expressed support for it.
The budget reconciliation process will give us more insight into the specific IRA and BIL funding provisions Trump and other Republicans are looking to axe. That same process will also determine the fate of tax credits such as 45Q, which encourages carbon capture and sequestration. In the near term, Democrats are pushing to get language into the government funding bill (which is separate from the reconciliation bill and must pass in some form by mid-March) that would require Trump to deliver congressionally appropriated money. If that happens, funds would start flowing to the DAC hubs — but don’t bet on it. Republicans are adamant that they won’t stand for such limitations on presidential authority.
DAC grantees, government employees, and implementation partners alike will have to do the wait-and-see thing for a while longer. “I do believe that when we get out of this fog of the first 100 days of the new administration, when they’re just trying to move fast and break things and get big headlines and try to make it seem like they’re keeping campaign promises, maybe things will slow down,” Faber told me. “Maybe they’ll get distracted or just move on to a new issue other than dismantling the federal government.”
Current conditions: Thousands are without power and drinking water in the French Indian Ocean territory of Réunion after Tropical Cyclone Garance made landfall with the strength of a Category 2 hurricane • A severe weather outbreak could bring tornadoes to southern states early next week • It’s 44 degrees Fahrenheit and sunny in Washington, D.C., where Ukrainian President Volodymyr Zelenskyy will meet with President Trump today to sign a minerals deal.
The 16th United Nations Biodiversity Conference, known as COP16, ended this week with countries agreeing on a crucial roadmap for directing $200 billion a year by 2030 toward protecting nature and halting global biodiversity loss. Developed nations are urged to double down on their goal to mobilize $20 billion annually for conservation in developing countries this year, rising to $30 billion by 2030. The plan also calls for further study on the relationships between nature conservation and debt sustainability. “The compromise proved countries could still bridge their differences and work together for the sake of preserving the planet, despite a fracturing world order and the dramatic retreat of the United States from international green diplomacy and foreign aid under President Donald Trump,” wrote Louise Guillot at Politico. The decision was met with applause and tears from delegates. One EU delegate said they were relieved “about the positive signal that this sends to other ongoing negotiations on climate change and plastics that we have.”
The Trump administration yesterday fired hundreds of workers across the National Oceanic and Atmospheric Administration and the National Weather Service, key agencies responsible for monitoring the changing climate and communicating extreme weather threats. The National Hurricane Center and the Tsunami Warning Center both operate under NOAA, and the layoffs come ahead of the upcoming hurricane season. “People nationwide depend on NOAA for free, accurate forecasts, severe weather alerts, and emergency information,” said Democratic Rep. Jared Huffman, the ranking member of the House Natural Resources Committee. “Purging the government of scientists, experts, and career civil servants and slashing fundamental programs will cost lives.” A federal judge yesterday temporarily blocked the administration’s mass firings of federal workers, so the status of those affected in this latest round is unclear. Somewhat relatedly, Heatmap’s Jael Holzman reports that the Nature Conservancy, an environmental nonprofit, was told by NOAA it had to rename a major conservation program as the “Gulf of America” or else lose federal funding.
The FBI reportedly has been questioning Environmental Protection Agency employees about $20 billion in climate and clean energy grants approved under the Biden administration, which EPA Administrator Lee Zeldin has insisted were issued hastily and without oversight. According toThe Washington Post, the Justice Department has asked several U.S. attorneys to submit warrant requests or launch grand jury investigations, but those efforts have been rejected due to lack of evidence or “reasonable belief that a crime occurred.” “It’s certainly unusual for any case to involve two different U.S. attorney offices declining a case for lack of probable cause and to have the Department of Justice continue to shop it,” Stefan D. Cassella, a former federal prosecutor, told the Post. Several nonprofits said their Citibank accounts holding the funding have been frozen without explanation.
Some Democratic states are apparently freezing out Tesla in response to Elon Musk’s political maneuvers within the Trump administration. Tesla operates on a direct-to-consumer sales model, so it doesn’t have to go through dealerships. More than 25 states ban or restrict direct EV sales in some way. The company has been lobbying to get permission to sell directly in these states, but some Democratic lawmakers are “disgusted” by Musk’s moves in Washington and are rebuffing lobbyists or dropping their support for proposed legislation allowing direct sales.
Apple is in trouble for claiming some of its Apple Watches are “carbon neutral.” A group of customers are suing the company after learning its claims relied on carbon offsetting projects in protected national parks or heavily forested areas, instead of “genuine” carbon reductions. “The carbon reductions would have occurred regardless of Apple’s involvement or the projects’ existence,” the plaintiffs said in their complaint. “Because Apple’s carbon neutrality claims are predicated on the efficacy and legitimacy of these projects, Apple’s carbon neutrality claims are false and misleading.” The lawsuit seeks damages, as well as an injunction that prevents Apple from using the carbon neutral claim to market its watches. Apple has a goal of net-zero carbon emissions by 2030.
Researchers in Amsterdam have examined the nests of birds known as common coots and discovered plastic items dating back to the 1990s, including a McDonald’s McChicken wrapper from 1996, and a Mars wrapper promoting the 1994 USA FIFA World Cup. “History is not only written by humans,” said Auke-Florian Hiemstra, who led the research. “Nature, too, is keeping score.”
Auke-Florian Hiemstra
Did a battery plant disaster in California spark a PR crisis on the East Coast?
Battery fire fears are fomenting a storage backlash in New York City – and it risks turning into fresh PR hell for the industry.
Aggrieved neighbors, anti-BESS activists, and Republican politicians are galvanizing more opposition to battery storage in pockets of the five boroughs where development is actually happening, capturing rapt attention from other residents as well as members of the media. In Staten Island, a petition against a NineDot Energy battery project has received more than 1,300 signatures in a little over two months. Two weeks ago, advocates – backed by representatives of local politicians including Rep. Nicole Mallitokis – swarmed a public meeting on the project, getting a local community board to vote unanimously against the project.
According to Heatmap Pro’s proprietary modeling of local opinion around battery storage, there are likely twice as many strong opponents than strong supporters in the area:
Heatmap Pro
Yesterday, leaders in the Queens community of Hempstead enacted a year-long ban on BESS for at least a year after GOP Rep. Anthony D’Esposito, other local politicians, and a slew of aggrieved residents testified in favor of a moratorium. The day before, officials in the Long Island town of Southampton said at a public meeting they were ready to extend their battery storage ban until they enshrined a more restrictive development code – even as many energy companies testified against doing so, including NineDot and storage developer Key Capture Energy. Yonkers also recently extended its own battery moratorium.
This flurry of activity follows the Moss Landing battery plant fire in California, a rather exceptional event caused by tech that was extremely old and a battery chemistry that is no longer popular in the sector. But opponents of battery storage don’t care – they’re telling their friends to stop the community from becoming the next Moss Landing. The longer this goes on without a fulsome, strident response from the industry, the more communities may rally against them. Making matters even worse, as I explained in The Fight earlier this year, we’re seeing battery fire concerns impact solar projects too.
“This is a huge problem for solar. If [fires] start regularly happening, communities are going to say hey, you can’t put that there,” Derek Chase, CEO of battery fire smoke detection tech company OnSight Technologies, told me at Intersolar this week. “It’s going to be really detrimental.”
I’ve long worried New York City in particular may be a powder keg for the battery storage sector given its omnipresence as a popular media environment. If it happens in New York, the rest of the world learns about it.
I feel like the power of the New York media environment is not lost on Staten Island borough president Vito Fossella, a de facto leader of the anti-BESS movement in the boroughs. Last fall I interviewed Fossella, whose rhetorical strategy often leans on painting Staten Island as an overburdened community. (At least 13 battery storage projects have been in the works in Staten Island according to recent reporting. Fossella claims that is far more than any amount proposed elsewhere in the city.) He often points to battery blazes that happen elsewhere in the country, as well as fears about lithium-ion scooters that have caught fire. His goal is to enact very large setback distance requirements for battery storage, at a minimum.
“You can still put them throughout the city but you can’t put them next to people’s homes – what happens if one of these goes on fire next to a gas station,” he told me at the time, chalking the wider city government’s reluctance to capitulate on batteries to a “political problem.”
Well, I’m going to hold my breath for the real political problem in waiting – the inevitable backlash that happens when Mallitokis, D’Esposito, and others take this fight to Congress and the national stage. I bet that’s probably why American Clean Power just sent me a notice for a press briefing on battery safety next week …