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The new climate politics are all about affordability.

During the August recess, while members of Congress were back home facing their constituents, climate and environmental groups went on the offensive, sending a blitz of ads targeting vulnerable Republicans in their districts. The message was specific, straightforward, and had nothing to do with the warming planet.
“Check your electric bill lately? Rep. Mark Amodei just voted for it to go up,” declared a billboard in Reno, Nevada, sponsored by the advocacy group Climate Power.
“They promised to bring down prices, but instead our congressman, Derrick Van Orden, just voted to make our monthly bills go up,” a YouTube ad told viewers in Wisconsin’s 3rd district. “It removes clean energy from the electric grid, creating a massive rate hike on electricity,” the voiceover says, while the words “VAN ORDEN’S PLAN: ELECTRICITY RATE HIKE” flash on screen. The ad, paid for by Climate Power, the League of Conservation Voters, and House Majority Forward, a progressive campaign group, was shown more than a million times from August 13 to 27, according to Google’s ad transparency center.
Both were part of a larger, $12 million campaign the groups launched over the recess in collaboration with organizations including EDF Action and Climate Emergency Advocates. Similar billboards and digital ads targeted Republicans in more than a dozen other districts in Arizona, California, Colorado, Iowa, Michigan, New York, Ohio, Pennsylvania, and Texas. There were also TV spots, partnerships with Instagram influencers, bus stop posters, and in-person rallies outside district offices — all blaming Republicans in Congress for the increasing cost of food, healthcare, and energy.

As others have observed, including Heatmap’s Matthew Zeitlin back in March, rising utility rates and the broader cost of living crisis are becoming a political liability for Republicans and President Trump. Clean energy advocates are attempting to capitalize on that, trying to get Americans to connect the dots between their mounting electricity bills and their representatives in Congress who voted to cut support for renewable energy.
Some of this is run-of-the-mill politicking, but it’s not only that. It also represents a strategic shift in how the climate movement talks about the energy transition.
It’s not new for green groups to make the argument that renewable energy can save people money. Relying on “free” wind and sun rather than fuels that are subject to price volatility has always been part of the sell, and the plummeting cost of solar panels and wind turbines have only made that pitch more compelling.
But it is new for the affordability argument to come first — above job creation, economic development, reducing pollution, and, of course, tackling climate change.
For most of the past four years, the climate movement has gone all in on trying to build an association in the American mind between the transition to clean energy and jobs. “When I think of climate change, I think of jobs,” then-candidate Joe Biden said during one of his 2020 campaign speeches.
It made sense at the time, Daniel Aldana Cohen, a sociologist at the University of California, Berkeley, told me. Just two years earlier, the Sunrise Movement had emerged as a political force with a headline-grabbing rally in Nancy Pelosi’s office demanding “green jobs for all.” The group was joined by then-newly elected Representative Alexandria Ocasio-Cortez, who soon introduced her framework for a Green New Deal that would offer a “just transition” for fossil fuel workers, ensuring them a place in the new clean energy economy.
The fossil fuel industry had seeded divisions between labor and environmental groups for decades by arguing that regulations kill jobs, and Democrats would have to upend that narrative if they wanted to make progress on climate. But the rationale was also more pressing: Unemployment was skyrocketing due to the COVID-19 pandemic, and whoever won the presidency would be responsible for rebuilding the U.S. workforce.
Fast forward to the end of Biden’s first year in office, however, and the unemployment rate had snapped back to pre-pandemic levels. Meanwhile, inflation was rising fast. Even though the Democrats managed to name their climate bill the “Inflation Reduction Act,” the administration and the climate movement continued talking about it in terms of jobs, jobs, jobs.
Cohen co-directs the Climate and Community Institute, a progressive think-tank founded in 2020, and admitted that “from the very start, we would just model every policy with jobs numbers,” partly because modeling the effects of policies on cost of living was a lot more complicated. Now he sees two issues with that approach. For one, it was always going to take time for new manufacturing jobs to materialize — much longer than an election cycle. For another, when unemployment is low, “everybody experiences inflation, but extremely few people experience a good new green job,” Cohen said.
During a recent panel hosted by the Institute for Policy Studies, Ben Beachy, who was a special assistant to Biden for climate policy, expressed some regret about the jobs push. “It wasn't addressing one of the biggest economic concerns of most people at that point, which was the rent is too damn high,” he said. But Beachy also defended the strategy, noting that all of the policies addressing cost of living in Biden’s big climate bill, like money for housing, public transit, and childcare, had been stripped out to appease West Virginia Democrat Joe Manchin. “So we were left without a strong policy leg to stand on to say, this is going to lower your costs.”
When the moderator asked what message Beachy thinks climate candidates should run on today, Beachy replied, “affordability, affordability, affordability.”
Jesse Lee, a senior advisor at Climate Power who also worked as a senior communications advisor in the Biden White House, echoed Beachy’s account of what went wrong post-IRA. The cost of living crisis makes it almost impossible to talk about anything else now, he told me. “If you don't start off talking about that, you’ve lost people before you’ve even begun,” he said.
Average U.S. electricity rates jumped 10% in just the year from 2021 to 2022, and have continued to rise faster than inflation. All evidence suggests the trend will continue. Utilities have already requested or received approval for approximately $29 billion in rate increases this year, according to the nonprofit PowerLines, compared to roughly $12 billion by this time last year. And these increases likely don’t reflect the expected costs associated with ending tax credits for wind and solar, hobbling wind and solar development, and keeping aging, expensive coal plants online.
In mid-July, Climate Power issued a strategy document advising state and local elected officials how to talk about clean energy based on the group’s polling. A post-election poll found that “more than half of Americans (51%) say the main goal of US energy policies should be to lower energy prices,” and that 85% “believe policymakers should do more to lower energy costs.” A more recent poll found that telling voters that “cutting clean energy means America produces less energy overall, and that means families will pay even more to keep the lights on,” was the most persuasive among a variety of arguments for clean energy.
This tracks with our own Heatmap Pro opinion polling, which found that the top perceived benefit of renewables in the U.S. is “lower utility bills” — though while 75% of Democrats believe that argument, only 56% of Republicans do. An affordability frame also aligns with academic research on clean energy communication strategies, which has found that emphasizing cost savings is a more effective and enduring message than job creation, economic development, or climate change mitigation.
The pivot to affordability isn’t just apparent in district-level campaigns to hold Republicans accountable. Almost every press release I’ve received from the climate group Evergreen Action this month has mentioned “soaring power bills” or “Trump’s energy price hike” in reference to various actions the administration has taken to hamstring renewables. Even clean energy groups, which at first attempted to co-opt Trump’s “energy dominance” frame, can no longer parrot it with a straight face. After Trump issued a stop work order on Orsted’s offshore Revolution Wind project, which is 80% built, the American Clean Power Association accused the administration of “raising alarms about rising energy prices while blocking new supply from reaching the grid.”
Several people I spoke to for this story pointed to the example of Mikie Sherill, the Democrat running for governor in New Jersey, who last week vowed to freeze utility rates for a year if elected. She immediately followed that statement with a promise to “massively expand cheaper, cleaner power generation,” including solar and batteries.
Dan Crawford, the senior vice president of Echo Communications Advisors, a climate-focused strategy firm, declared in a recent newsletter that Democrats should “become the party of cheap electricity.” He mused that we may be at an inflection point “where the old politics of clean-vs.-polluting makes way for a new debate of cheap-vs.-expensive.”
Debate is probably too tame a term — the claim to affordability is becoming a full-on messaging war. Last week, President Trump took to social media to declare that states that get power from wind and solar “are seeing RECORD BREAKING INCREASES IN ELECTRICITY AND ENERGY COSTS,” — a claim that has no basis in reality. The Trump administration is leaning heavily on affordability arguments to justify keeping coal plants open. In defense of canceling Revolution Wind, Interior Secretary Doug Burgum told Fox News that “this is part of our drive to make sure we’ve got affordable, reliable energy for every American … These are the highest electric prices in the country coming off of these projects.” On Thursday, Energy Secretary Chris Wright posted a news story about his agency rescinding a loan for an offshore wind transmission project, writing that “taxpayers will no longer foot the bill for projects that raise electricity prices and ultimately don't work.”
Clean energy proponents aren’t just going up against Trump — the fossil fuel industry has leaned on affordability as a rhetorical strategy for a long time, Joshua Lappen, a postdoctoral fellow at the University of Notre Dame studying the energy transition, told me. Lappen, who lives in California, said cost has been at the forefront of conflicts over climate policy in the state for a while. At the moment, it’s driving a fight over oil refinery closures that threaten to drive up gas prices even more. “I took a trip over the weekend and drove through the Central Valley,” Lappen told me, “and there are placards zip-tied to every gas pump at Chevron stations that are highlighting that state climate policy is increasing the cost of gas.”
I asked Lee, of Climate Power, how the climate movement could make a convincing case when clean energy has become so politically charged. He’s not worried about that right now. “I don’t think we necessarily need to win a debate about what’s cheaper,” he said. “All we have to do is say, Hey, we're in favor of more energy, including wind and solar, and it's nuts, nuts to be taking wind and solar and batteries off the table when we have an energy crisis and when utility rates have gone up 10%.”
That may work for now, at least at the national level. Americans tend to blame whoever is in office for the economic pains of the moment, even though presidents have little influence on prices at the pump and it can take years for policy changes to make their way into utility rates.
But there’s a difference between defensively blaming rising energy costs on the administration’s efforts to block renewables, and making a positive case for the energy transition on the same grounds. While there is an argument for the latter, it’s a lot harder to convey.
The factors pushing up energy prices, such as necessary grid modernization and disaster-related costs, likely aren’t going away, whether or not we build offshore wind farms. Meanwhile, the savings that large-scale wind and solar projects offer won’t be experienced as a reduction in rates — they won’t be experienced at all because they’re measured against a counterfactual world where renewables don’t get built. That’s a lot trickier to communicate in a pithy campaign. People may end up blaming the wind farms either way.
This dilemma is a hallmark of the so-called “mid-transition,” Lappen told me. The term was coined by his advisor, the energy engineer and sociologist Emily Grubert, and Sara Hastings-Simon, a public policy professor at the University of Calgary. The two argue that the mid-transition is a period where fossil fuel systems persist alongside the growing clean energy sector.
“Comparisons of the new system to the old system are likely to rest on experience of a world less affected by climate change, such that concerns about lower reliability, higher costs, and other challenges might be perceived as inherent to zero-carbon systems, versus energy systems facing consequences of climate change and long-term underinvestment,” they write.
To Cohen, advocates need to go a lot further than rhetoric to link clean energy with affordability. “We need to rebuild the brand and then rebuild the investment priorities of climate action so that working class communities see and literally touch direct, tangible benefits in their life,” he said. He described a “green economic populism” with much more public investment in helping renters access green technologies that will lower their bills, for example, or in fixing up homes that have deferred maintenance so that they can eventually make energy efficiency improvements.
It’s not about abandoning industrial policy or research and development, Cohen told me, but rather about a shift in emphasis. He pointed to Sherill’s approach. “She's not just saying, oh, clean energy will automatically lower bills if you just unleash it. She's like, I'm going to assertively use the government to guarantee a price freeze, and then I’m going to backfill that with clean energy policies to bring down prices over time.”
To be fair, the IRA did contain policies that would have produced more tangible benefits. The $7 billion Solar for All program would have delivered the benefits of residential solar — i.e. energy bill savings — to low-income households all over the country. The remainder of the Greenhouse Gas Reduction Fund, of which Solar for All was a part, was set to make a range of other green home upgrades more accessible to the working class, and the Green and Resilient Retrofit Program would have done the same for low-income housing developments and senior living centers. Electric school bus grants and urban tree-planting programs would have brought cleaner, cooler air to communities.
These were big, ambitious programs that were never going to produce results in the span of two years, and now the Trump administration has made every effort to ensure they never do. Whether they would have paid political dividends eventually, we’ll never know. But a successful energy transition may depend on giving it another shot.
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Generate Capital, CalSTRS, and the Rhodium Group have teamed up on a new Transition Acceleration Framework to measure and assess emissions impacts.
The most common way to judge whether a company or project is helping to tackle climate change is to measure emissions. Has the company reduced its carbon footprint? Will the project add fewer greenhouse gas emissions to the atmosphere than alternatives?
It’s a useful metric, but a limited one. One company might be doing more to advance the energy transition than another — by investing in an expensive, early-stage solution such as geothermal power, for example — but a comparison of their carbon footprints won’t necessarily show it. At the project level, a solar farm in Mississippi, where solar deployment has lagged, will do more to decarbonize the U.S. power grid than one of equal size in California, even though both projects emit zero carbon.
This presents a challenge for climate-minded investors like Jonah Goldman, the chief strategy officer of Generate Capital, who are trying to figure out where their dollars can make the biggest difference. To solve it, Goldman worked with colleagues at the California State Teachers Retirement System, which backs Generate’s investments, and a team at the Rhodium Group to develop a new way for investors to assess where to put their money.
“The question that most of the frameworks out there ask is, what are your carbon emissions today, and can your carbon emissions be lowered?” Goldman told me. “The Transition Acceleration Framework asks, how can you apply capital that has the best chance of getting to decarbonization over a reasonable time frame?
“It sounds like a similar question. It sounds like semantics. But it’s actually quite different,” he said.
At a high level, the Transition Acceleration Framework measures how much additional decarbonization a given investment can deliver beyond what would likely have occurred anyway. It can also be used to evaluate policy interventions and procurement decisions, such as where to get power for a data center. The Rhodium Group published a white paper describing the methodology on Thursday, as well as an accompanying report using it to evaluate options for powering data centers in the U.S.
The Transition Acceleration Framework has three components: transition potential, transition efficiency, and acceleration factor.
Transition potential is “the size of the emissions-reduction opportunity,” the white paper says — it measures the gap between the current trajectory for a given technology and its potential deployment in a deeply decarbonized world. Some of the solutions with the highest transition potential scores, per Rhodium’s analysis, include light duty electric vehicles and utility-scale solar.
Transition efficiency measures how effective a dollar spent on that technology can be at closing the gap, based on an estimate of the total capital expenditure required to realize the potential. There, more nascent solutions like low-carbon cement and geothermal power score higher than EVs and solar.
Rhodium combines these two complementary metrics into a single “technology factor,” a score on a scale from one to ten that can help identify the highest-leverage sectors to invest in. (The project is similar in spirit to Heatmap’s Decarbonize Your Life series, in which we tried to determine the highest-leverage actions a given individual could take to cut emissions. If you missed it, check it out.)
While the transition potential and efficiency metrics provide a high-level view into how transformative different types of investments can be, the third component of the framework — the acceleration factor — helps distinguish between specific projects.
This starts with an assessment of five “acceleration attributes” — cost reduction, capital availability, new markets, infrastructure and supply chains, and political economy — that represent different mechanisms by which a single investment can help move an entire technology category forward.
For cost reduction, for example, an investor might ask how likely it is that the project will reduce the cost of future deployments through learning by doing or economies of scale. If it’s a first-of-a-kind project, the answer is likely yes. For capital availability, they might look at whether the investment will de-risk the technology. Goldman praised Amazon’s early investment in Rivian delivery vans — not just because it took gas-powered Amazon vans off the road, but because it also spurred other automakers and major shippers such as Walmart and GM to follow suit.
“While the Amazon-Rivian deal wasn’t 100% responsible for it, it certainly was a huge signal to the market that there was safety in solving this last mile delivery problem,” he said.
The Rhodium report outlines a method investors can use to score and weight the various attributes and combine them with the technology factor score to reach a final “acceleration factor” score.
In an accompanying report, Rhodium researchers used the framework to compare a number of different options for powering data centers in the U.S. It’s a high-level assessment — i.e. it doesn’t consider project-specific acceleration attributes — but it provides a rough hierarchy of the arrangements that accelerate the energy transition the most against those that do the most harm. At the top of the list is a grid-connected data center that signs a power purchase agreement with a clean, firm generator, such as a nuclear or geothermal plant. At the bottom, with a negative score indicating it would actually hinder progress relative to a regular grid connection, is an off-grid data center powered entirely by natural gas.
Of course, hyperscalers prioritizing speed to power are unlikely to wait around for a nuclear plant to get built. But there are plenty of options between that and behind the meter gas. An off-grid data center that builds enough renewables and batteries for 95% of its electricity needs and relies on gas backup scores higher than a grid-connected project that buys spot market renewable energy certificates.
“Different data center power configurations can have a meaningfully different impact on the transition, even if you’re looking at things that might on the surface seem relatively similar,” Michael Delgado, a partner at Rhodium, told me.
For now, the Transition Acceleration Framework is just that — a framework. Rhodium is piloting it with Generate and CalSTRS, as well as some additional partners, conducting bespoke assessments or their portfolios and projects. The hope is that it could eventually inform not just individual investment decisions or portfolio analyses but regulations and policy packages.
“This is an open method that we’re trying to put out there and get feedback on from the investment and philanthropic and policy world,” Delgado said.
The question is whether he still has a choice.
The United States has resumed bombing Iran, the U.S. military’s regional command announced on Wednesday. The United States also bombed more than 80 sites on Tuesday, including radar and air defense facilities, but the new set of targets is more expansive.
President Trump declared on Wednesday that the ceasefire between the two countries is dead. Yet he also suggested that an extended war isn’t on the table. “We’re not looking for long term,” he said at the NATO Summit in Turkey. “Anything that happens is going to be over very quickly … and will only make it safer, including for oil.”
Such a statement surely reflects the president’s awareness that his war isn’t very popular among Americans. But does he have any leverage anymore over how long the war lasts? When Trump okayed the interim Iran ceasefire in June, he said that Iran would not toll oil and gas tankers passing through the Strait of Hormuz. Since then, Iran and Oman have started setting up the infrastructure to do just that. That discrepancy may have been the ceasefire’s doom: The truce broke down after Iran fired missiles at oil and natural gas tankers that were allegedly not using its approved route through the strait. (Iran has said that its preferred route through the waterway is the “only safe passage.”)
American officials have said that restoring freedom of navigation through the Strait of Hormuz is one of their goals in ending — and now, resuming — the war. But the strait was open to all before the war began; Iran only shuttered it after the United States and Israel began bombing in February. Yet now that Iran has learned how easily it can close the strait and keep it closed, it has a new weapon to wield over the American and European economies.
And what of the country’s nuclear program? Back in March, it allegedly didn’t play into the calculus, partly because President Trump claimed the U.S. had destroyed the program in 2025. Instead, Secretary of State Marco Rubio said that the president had no choice but to enter the new conflict because Israel was already going to bomb Iran, and since the Islamic Republic would respond by targeting American bases in the Middle East, the United States might as well strike first. A day later, President Trump changed the story, saying that Iran was already planning to bomb U.S. military bases, which forced pre-emptive action on America and Israel’s part.
Yet by April 1, the president had justified the war to the American people by citing Iran’s nuclear program more than 20 times. “For years, everyone has said that Iran cannot have nuclear weapons. But in the end, those are just words, if you’re not willing to take action when the time comes,” he said. The new conflict had obliterated the country’s navy, defense industrial base, and ability to produce missiles, he said. Yet Iran — partly thanks to its small, cheap drones — was able to keep the strait closed for another two months.
What does all of this mean for energy and decarbonization? More expensive fossil fuels. The global crude benchmark Brent surged to $80 a barrel today, while West Texas Intermediate surpassed $74, bringing both to roughly the same level as when the June ceasefire was first announced. Researchers at Brown University estimate that Americans have paid $60 billion — or roughly $500 per household — more for gasoline and diesel than they would have had the conflict never happened.
If this stage of the war doesn’t go “long term,” as Trump hopes, then at least the world will have a little more oil than anticipated to work with, as stockpiles have risen in recent days. But a new and extended phase of the war threatens a return to the prices seen earlier in the spring — or prices that go even higher, should China decline to tap its reserves this time. One potential early pain point is diesel, which is already expensive because of Ukraine’s strikes on Russian refineries. Costlier fuel will keep encouraging more EV sales in Europe, Asia, and even the United States; high diesel prices in particular will provide a tailwind to the shockingly rapid electrification of China’s trucking sector.
Of course, the war will bring much more besides — more squandered time, more military spending, more human misery. It is the first that Trump might regret most. A conflict the White House joined without much public debate — and once forecast would last “four to six weeks” — now looks likely to eat much of his second term.
Pollution from peaker plants combined with heat and smoke can push summer air quality into the danger zone.
If you ever have to pick a day to stay inside, pick July 5. In cities across the United States, the Fourth of July’s pyrotechnic revelries make the wee hours after Independence Day consistently one of the worst of the year for air quality. Just look at Washington, D.C., which briefly held the distinction of having the world’s most polluted air this past Sunday morning following one of the largest firework displays in history.
But if you have to pick a second day to stay inside, shoot for one during the second half of July, which is the hottest period of the year in the United States. For one thing, it’s just plain miserable out. For another, the country’s 1,000 or so peaking power plants, or “peakers,” are more likely to be operating to meet the energy demands of heavy air-conditioning use, emitting disproportionately high levels of pollution for the electricity they generate.
Peakers are the backup power sources operators run only when demand is at its highest, such as during a heat wave. Peakers are also “probably the dirtiest and most expensive energy on the grid,” Abbe Ramanan, who leads the Phase Out Peakers project at the nonprofit Clean Energy Group, told me. “They tend to burn dirtier fuels, such as oil, and typically have older and less efficient emissions control systems.”
Some 63 million Americans live within a three-mile radius of a peaker, according to a 2023 Clean Energy Group report, where they face health conditions including “significant … increases in estimated rates of hospitalization for asthma, acute respiratory infection, and chronic obstructive pulmonary disease,” all conditions associated with proximity to fossil fuel-fired plants. On top of that, historic redlining practices mean two-thirds of peakers are located in communities with a higher percentage of low-income households than the national average, according to the group’s reporting. And yet peakers also provide life-saving power and AC when a blackout could mean death, such as during last week’s heat wave on the East Coast, making them simultaneously a menace and necessity to maintaining public health, at least with our current grid.
What exactly is peaker plant pollution? How does it appear in the Air Quality Index you might see on your phone? And how do local regulators consider pollution when issuing air quality forecasts? I set out to get answers.
To understand peaker plant pollution, let’s start with a refresher on how air quality alerts work.
The AQI scale runs from 0 to 500 and reflects the local concentrations of five major pollutants: particulate matter, ozone, carbon monoxide, sulfur dioxide, and nitrogen dioxide. Each pollutant has an Environmental Protection Agency-regulated benchmark for what is safe (many of which are set at levels clean air advocates argue are too lax). As concentrations increase, the overall AQI rises to warn first “sensitive groups” and then the general public when to take precautions, such as limiting outdoor activity or wearing a mask. (To learn more about the AQI scale, read my colleague Emily Pontecorvo’s explainer here.)
As do all fossil fuel power plants, peakers release planet-warming carbon dioxide as a byproduct of combustion, along with nitrogen oxides, particulate matter, volatile organic compounds, and other trace toxins that aren’t captured in the AQI, such as heavy metals. Oil and coal-fired power plants also release sulfur dioxide, which creates acid rain; natural gas-fired plants, on the other hand, emit comparatively little.
While NOx is an irritant in its own right, it is, more significantly, a key ingredient in the chemical reaction that creates ozone. When NOx mixes with volatile organic compounds — found in vehicle exhaust, personal care products, and yes, also power plant emissions — on a warm, sunny day, the chemical reaction creates ground-level ozone, which is corrosive enough to scar lung tissue with repeated, prolonged exposure. An expert once helpfully likened it to me as “sunburn on your lungs.” Health researchers have determined that, globally, ozone (also known as smog) causes a million premature deaths every year.
Yes, although it’s not an easy or neat measurement.
Peaker plants are used to rapidly supply electricity to the grid when demand exceeds the baseload capacity. As a result, they run infrequently — only about 5% of the year, or 464 hours per plant, in 2022, per Clean Energy Group’s analysis of 2022 EPA data. Using a stricter definition of peakers, the Government Accountability Office found that the plants represent nearly a fifth of the nation’s potential generating capacity but produce only about a 30th of its overall electricity, mostly due to the time they spend sitting idle.
Power plants use a number of emission control systems to limit emissions of various pollutants. But the EPA has much looser requirements for low-operating peakers, which “may not have effective, if any, emissions control technology,” the GAO writes. When operational, peakers emit an estimated 60 million tons of CO2 per year, with a median NOx emission rate about 6.1 times greater per unit of electricity generated by natural gas-fueled peakers compared to non-peaker gas plants.
“One really big issue with peakers is the emissions control systems are not operating during times when the plant is starting up or shutting down, which means that emissions are just unabated during those times,” Ramanan told me. “And because those plants tend to operate in short bursts, such as during a heat wave, they will start up and shut down more frequently.” Even up to a day beforehand, when the plant is running its test cycle, it might be emitting pollutants even while not actually providing any power.
One 2017 study by University of Wisconsin–Madison researchers found that across the Eastern U.S. from 2007 to 2012, total electricity generation rose by about 4% for every 1-degree Celsius (1.8-degree Fahrenheit) increase in daily summer temperature, with NOx correspondingly up 3.6% and CO2 up 3.3%. Though these numbers aren’t peaker-specific, the plants represent a disproportionate share of the rise since they’re reserved for the hottest, heaviest-load days.
Though the slower rise in NOx suggests “slightly cleaner plants … on average,” the authors write, that is “not completely unexpected, as new natural gas plants are required to have controls installed even as some peaking plants do not.” They note, however, that their data does not fully capture grandfathered-in units, since gas- and oil-fired peakers are allowed non-direct-measurement reporting.
In fact, in Maine and Connecticut, which “use more petroleum for electricity generation than most states in the U.S., primarily as peaking plants deployed on the hottest days,” NOx jumped 33% and 23% per degree Celsius, respectively. Separately, a 2016 study found that peaking plants may have accounted for up to 87% of local particulate matter in the PJM Interconnection during a July 2006 heat wave.
Peaker plant pollution is significant enough that chronic exposure in local communities has measurable health impacts. But how does it factor into summer AQI levels?
My colleague Matthew Zeitlin spoke this week with Margaret LaFarr, the New York State Department of Environmental Conservation’s director of air resources, who told him that peaker plant pollution is “one of the factors we consider” in formulating its air quality forecasts. But because the state’s agency uses modeling to predict when and where air quality will be poor, the granularity of a single peaker just isn’t there. “If we have to have specific information on the emissions, it would not be ready in time for a timely advisory,” LaFarr said.
Ramanan, whose nonprofit has diligently recorded the negative impacts of peakers, concurred that it is “difficult to pinpoint just how much peaker plants contribute to local air pollution because those sorts of studies are just very expensive to do.” Studies that look at disproportionate health impacts, on the other hand, are a little simpler to put together.
Additionally, while the AQI might rise locally near peakers during a heat wave, because of the nature of the scale, it can’t neatly distinguish why. A high ozone reading, for example, might just as easily be due to tailpipe emissions on a hot day; in the New York metro area, vehicles are responsible for an estimated 60% of the air pollution. Meteorological conditions — whether it’s sunny, a key factor in ozone formation, or which way the wind is blowing — obscure the picture. Particulate matter readings could be from a peaker, for example, but they could just as easily be from wildfire smoke.
One way air quality activists like to think about peaker pollution is as a co-occurrence — that is, a compounding pollution on top of already degraded conditions. Hot days tend to be the worst for ozone already, because of the aforementioned tailpipe pollution; peakers, activated to help with the heat-related energy load, then release more ozone-generating emissions at the worst possible time.
While a precise breakdown of the AQI might not be there for peakers, “we know the days that are more conducive to ozone formation generally tend to be those same days where people are cranking up their ACs and there is a higher demand for energy,” LaFarr said.
There is some speculation that cleaner input fuels could help reduce the worst peaker plant emissions. Generally, this is true: The 2017 study by the University of Wisconsin–Madison researchers found that from 1997 to 2015, in Texas, petroleum use in electricity generation dropped 85% and coal dropped 12%, while natural gas increased 57%. As a result, Texas had the lowest level of SO2 sensitivity of any state.
But beyond the existing fuel mixes, fuel switching is not a clean fix for peaker plants. “Burning things like hydrogen and [methane captured from waste processing facilities] don’t actually reduce the air pollution burden in any meaningful way,” Ramanan argued. “Hydrogen in particular tends to actually have extremely high levels of NOx emissions when it’s combusted.”
In Astoria, a neighborhood of New York City, activists opposed retrofitting the local oil-powered peaker plant to run on natural gas because doing so would “lock the state into relying on fossil fuels for decades, fly in the face of the state’s climate law that requires a drastic reduction in carbon emissions by mid-century and continue to pollute in an already overburdened community where many residents are immigrants and live below the poverty line,” Inside Climate News reported. At the same time, doing so would “reduce the state’s greenhouse gas emissions by more than 5 million tons through the year 2035,” per its owner, NRG Energy.
But a third way emerged: New York eventually denied NRG’s permit because it violated the state’s climate law, and the utility subsequently sold the Astoria facility to serve as the converter station for Beacon Wind, a development off the coasts of New York and Massachusetts.
While wind, new transmission, and battery storage all face enormous headwinds in the current political climate — meaning that many peaker plants targeted by activists for retirement are likely to stick around for years yet — advocates remain adamant that a playbook exists for decarbonization. “In terms of replacing one-to-one capacity, we’ve been looking at battery storage even just at peaker plant sites that can be paired with renewables or grid connected batteries,” Ramanan said, adding that “really great work is also being done in terms of virtual power plants and demand reduction — because it’s not just about reducing peak capacity, it’s also reducing the peak overall.”
That raises a final, particularly thorny question: Is air pollution from peaker plants “worth it” if it means being able to run AC?
A 2018 follow-up study by the same team of researchers at the University of Wisconsin–Madison explored a similar question. They found that climate change alone would increase summer mortality related to the smallest airborne particulate pollution by more than 13,500 deaths, and ozone-related mortality by more than 3,500 deaths in a mid-century scenario. AC-driven power sector emissions — full-fleet numbers, albeit disproportionately including peakers — would, on top of that, account for 654 PM 2.5 deaths and 315 ozone deaths, a nearly 5% and 9% increase, respectively, over climate impacts alone.
Researchers credit access to air conditioning in the United States with a 75% decline in deaths, and modeling exercises frequently show that a blackout during a heat wave could realistically result in hundreds of thousands of people needing medical attention. But clean air advocates also point to examples like Astoria, where the denial of a permit to retrofit a peaker plant for slightly better fossil fuels resulted in the grounds being used for a renewable energy source instead.
It’s certainly not an easily replicable process given the current political and economic climate, but it also perhaps suggests a false dichotomy of peakers vs. AC. Affordable power and livable spaces are just two among a host of community needs energy and public health officials must keep in mind.
“It’s not enough to just replace the existing system with renewables and battery storage and have fewer emissions,” Ramanan said. “It also has to be equitable, because otherwise we’re just going to replicate the same issues we’re having now in different ways.”