You’re out of free articles.
Log in
To continue reading, log in to your account.
Create a Free Account
To unlock more free articles, please create a free account.
Sign In or Create an Account.
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
Welcome to Heatmap
Thank you for registering with Heatmap. Climate change is one of the greatest challenges of our lives, a force reshaping our economy, our politics, and our culture. We hope to be your trusted, friendly, and insightful guide to that transformation. Please enjoy your free articles. You can check your profile here .
subscribe to get Unlimited access
Offer for a Heatmap News Unlimited Access subscription; please note that your subscription will renew automatically unless you cancel prior to renewal. Cancellation takes effect at the end of your current billing period. We will let you know in advance of any price changes. Taxes may apply. Offer terms are subject to change.
Subscribe to get unlimited Access
Hey, you are out of free articles but you are only a few clicks away from full access. Subscribe below and take advantage of our introductory offer.
subscribe to get Unlimited access
Offer for a Heatmap News Unlimited Access subscription; please note that your subscription will renew automatically unless you cancel prior to renewal. Cancellation takes effect at the end of your current billing period. We will let you know in advance of any price changes. Taxes may apply. Offer terms are subject to change.
Create Your Account
Please Enter Your Password
Forgot your password?
Please enter the email address you use for your account so we can send you a link to reset your password:
Now back at the University of Pennsylvania, she talks to Heatmap about community engagement, gaps in the decarbonization market, and goats.

In November of 2020, Jennifer Wilcox had just moved to Philadelphia and was preparing to start a new chapter in her career as a tenured “Presidential Distinguished Professor” at the University of Pennsylvania. Then she got the call: Wilcox was asked to join the incoming Biden administration as the principal deputy assistant secretary for the Office of Fossil Energy, a division of the Department of Energy.
Wilcox had never even heard of the Office of Fossil Energy and was somewhat uneasy about the title. A chemical engineer by training, Wilcox had dedicated her work to climate solutions. She was widely known for having written the first textbook on carbon capture, published in 2012, and for her trailblazing research into removing carbon dioxide from the atmosphere. With Penn’s blessing, she decided to take the job. And in the just over three years she was in office, she may have altered the course of U.S. climate action forever.
First, Wilcox led a total transformation of the department to align it with the Biden administration’s climate goals. She started by arranging 15-minute meetings with each of the nearly 150 employees who worked with her at the D.C. office to understand their perspectives on their work, whether they were happy, and their fears and challenges. She admits she can be intense.
“I took all that information, and I sat on it with many weekends and a blank piece of paper and a pencil and drew crazy diagrams,” she told me, trying to funnel everyone’s feedback into a new vision for the department.
Previously, the Office of Fossil Energy’s primary function was to support research into oil, gas, and coal extraction and use. Wilcox flipped the mission on its head, reorganizing the department into one that would support research, development, and deployment of solutions that reduced dependency on those resources and minimized their environmental impacts. By July, she had codified that mission in a new name — the Office of Fossil Energy and Carbon Management.
Wilcox maxed out her leave this spring. I caught up with her about a week after she left the DOE, as she was picking up where she left off — preparing for her first semester as a professor of chemical engineering and energy policy at Penn. She’s also starting a new side gig as chief scientist at Isometric, a carbon credit certification company that’s trying to improve trust in carbon removal measurement and verification through rigorous standards and transparency.
I asked her to reflect on her time at the Department of Energy, the changes she oversaw, and what she’s looking to do next. Our conversation has been edited for length and clarity.
When was your last day at DOE? Did you leave because you had an obligation to come back to Penn?
My last day was Friday, May 31, so just a week or so ago. Typically, when you’re in an academic tenured position, you can have a maximum of a two-year leave. Within the first year of my appointment at DOE, the Bipartisan Infrastructure Law went through, and then in the second year, the IRA went through — the Inflation Reduction Act. And I was like, this is big stuff. It felt like just a defining moment — in my career, but also in terms of climate legislation. And I thought, how could I possibly leave now? So I went back to Penn and I wrote, I thought, a pretty thoughtful letter of the impact that I could have if I could stay just a year and a half longer. And they said yes.
Could you share the story of how you were asked to go work for the department in the first place?
Sure, it’s pretty funny. Something that many people don’t know is we have a small farm — we had 22 acres in Massachusetts, and goats and a pig and chickens and oh my goodness. Penn was like, “We’ll move your goats, too,” and so we moved everybody. And here I am at the kitchen table amidst boxes, and the goats are outside, and I’m on my laptop, and I get this email from the Biden-Harris transition team. I was like, ain’t nobody got time for that. That’s spam. Delete! And then a couple days go by and I get another one, and I was like, come on. Is this real? And I forwarded it to my husband. He’s an ER doctor, and he’s like, “Honey, that’s real. You have to respond!” And so I sent my CV.
One of the first things you did was rename the department. How did that happen?
When I came in, it was really early days of, okay, net zero by 2050, and there was a question of, what does that mean for our office? Should this office exist in a net zero world? I knew that I was being recruited to think about reshaping, rethinking the portfolio.
We only had two R&D offices at the time. One was called Oil and Gas — we renamed that Office of Resource Sustainability. The other was literally the Office of Coal. What I decided to do was take that program and move it over. That whole office is all about, if you’re choosing to extract energy resources from the Earth, how do you do it in a way that’s minimal impact?
Now, what’s left is how you manage the pollution of how we use fossil fuels — that’s the carbon dioxide. And so we built out a whole new division on carbon removal. We teased out a whole program on hydrogen, and then we also separated out carbon conversion into its own division, and then carbon transport and storage. And so rather than one program focused on carbon, we had five, which is pretty cool. I mean, the amount that I was empowered and supported — and by the way, we got it all through without a single pushback, in nine months. So that was huge.
How would you characterize how the field changed from the time that you entered the office until now? Have research questions changed? Have policy priorities changed?
I think things are starting to change. One of the things from these last few years of having the resources that have started to become mobilized, it’s helping us to recognize where the gaps really are. When you have money to be able to put out for certain topic areas, you get to see who’s going to apply, and who applies gives you an indication of where the technology is at and how much of it’s ready.
For instance, if you look at the $3.5 billion for direct air capture hubs, we had to write the funding opportunity announcement to meet industry where they’re at. There’s only a couple of companies that are really even at a stage where they can start to think about demonstration on the tens of thousands of tons of removal, let alone a million tons per year.
Some of the gaps that we saw were, in direct air capture, making sure that there’s enough companies that are supported to be able to get us to the scale that we need to. And then for the other approaches to carbon removal, making sure that if we want these projects to be durable, in terms of carbon removed on a time scale that impacts climate, we need to figure out how to quantify the net carbon that’s removed.
And then one significant gap that we saw that we are trying to fill with this funding: When we think about corporations and net zero pledges, a lot of times the carbon removal purchasing is associated with Scope 3 emissions that companies don’t have the ability to control. These are supply chains. It could be paper, it could be fuel, food, glass, cement, steel. And so looking at that whole sector, it’s about 10 different industrial sectors that we need to figure out how to decarbonize. If we can think about decarbonizing these supply chains, it’ll take some of the pressure off of the carbon removals to counterbalance those.
The last piece that I feel like gets forgotten is, in the infrastructure law, we had $2.5 billion for building out geologic storage. That’s an issue because you can do the carbon capture, but the big question is, where are you going to put it? And can you get it from point A to point B? We have a whole program called CarbonSAFE that essentially shepherds the industry through the process, starting with characterization all the way to a class six permit from EPA. Building that capacity out means that’s one less thing that industry has to worry about as they’re looking at carbon capture.
During your time there, the department was interfacing with hundreds of researchers and startup founders who were all trying to get new projects or companies off the ground. I’m curious, what are some of the most common misunderstandings you saw from applicants?
There’s a couple of things, but one that stands out — and maybe this is because I have a background in academia — there’s a lot of technologies out there that are actually pretty far along, especially in point source capture [technologies that capture carbon from the smokestacks of industrial facilities before it enters the atmosphere]. Yet, at universities, they’re still trying to develop the next solvent or solid sorbent. It’s like, we can stop doing that.
Where the R&D comes in is actually getting data over a long period of time. How does the material behave? How can we recycle it and reuse it over and over again? How can we design it in a way that reduces NOx, SOx pollution, particulate matter, making the air cleaner? But it’s not about how do we just develop a new technology, because there’s a lot out there.
It seems like one of the hardest things the department was trying to do under your leadership was to strengthen its work on community engagement and community benefits — hard because many advocates for fenceline communities are so skeptical of the solutions you were working on. How did you navigate that tension?
Well, one thing is, I know what I don’t know, and I’m usually pretty willing to say what I’m good at and what I’m not good at. In the early days, I knew that this was going to be a challenge for our office and so I recruited a social scientist: Holly Jean Buck, she’s a professor at the University of Buffalo. We brought Holly in to help us develop some of the language around … it started off with community benefits, but some of our investments don’t always lead to benefits, so let’s be honest, right? And so what we wanted to think about is, what are the societal considerations and impacts of our investments? We ended up recruiting a few others, and now we have a team that’s focused on domestic engagement, and also communications and outreach.
What do you think it could mean for some of what you’ve accomplished and other things you’ve set in motion if Biden is not reelected?
I feel pretty good about what we’ve put in place, that it’s sustainable. The other thing about what I saw is that industry is really leaning in on doing these things. The low-carbon supply chains — a lot of glassmakers, cement facilities — are very interested in improving energy efficiency, are interested in carbon capture or using hydrogen as a heat source. And so what we have done is really looking at making sure they’re economic. All of these efforts that we’ve put in place are extremely bipartisan, and they’re essentially just supporting industry in a way such that they’re achievable because they’re economic.
Let’s talk a little bit about what’s next. Why did you want to work with Isometric? What are you going to be doing there?
When I was at DOE, from the beginning, we were looking at, you know, there’s a lot of the carbon removal portfolio where we don’t have the rigor in place to be able to determine the durability of the removals, the additionality of them, the time scale on which the carbon is actually removed, quantifying net removed. And so we started a commercialization effort, leveraging our national labs to help us to develop the framework. Isometric is working toward establishing rigorous frameworks, and I’m hoping to leverage the efforts ongoing at DOE — and with transparency, so that others may follow, which could lead to more durable removals and greater impact at the end of the day.
What about on the academic side of your career. Where do you plan to focus your research?
Some of the work that we were doing, or the team has been continuing to do while I’m at DOE, is mineralization, looking at different waste feedstocks that have alkalinity [a property that’s useful for carbon removal], like magnesium and calcium. One of the things that we’re going to focus a little bit more on is asking the question of, what else is there? You know, if there’s rare earth elements or critical minerals that could be used for clean energy technologies, EV motors, magnets for wind turbines. And so, I’m really excited about looking at these materials and seeing what value is there.
I’m also really excited about helping with the measurement and quantification of some of the more natural systems of removal, like forests. One of the new majors at Penn is artificial intelligence. I think there’s an opportunity right now to think about, how can we take data, whether it’s from drones or whether it’s from Lidar and airplanes or satellite data, bringing it together in an integrated way again, so that we have more robust databases that are also transparent.
There’s so many debates going on around carbon removal right now, and it feels like they often come down to philosophical differences. Are these debates important? Or do we just need to decide what we’re going to do and then reevaluate it later?
We’re not in a position anymore to think we can just decarbonize and not do greenhouse gas removals. We know we need to do both. And so I think that there are some kind of “no regrets” things that we can do — opportunities, as we’re scaling up both in the near term, to think about them in a coordinated way. In communities that don’t have solar today, imagine you have a direct air capture facility going in, and then they’re bringing clean energy that they’re using for direct air capture, but they’re bringing it for the first time ever to a community that wouldn’t otherwise have access.
But it really is regional. I think it’s regional in that there’s limited resources in any given region, whether it’s low-carbon energy, land, clean water, even geologic pore space. You have it in some states and not others. And so we really need to look at those resources and always prioritize decarbonizing, but recognize that it’s not necessarily one or the other.
Log in
To continue reading, log in to your account.
Create a Free Account
To unlock more free articles, please create a free account.
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.”