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As US bets big on hydrogen for clean energy, local communities worry about secrecy and public health

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Monday, July 29, 2024

Billions of dollars in public money are beginning to flow to seven “hydrogen hubs” around the country — regional nerve centers for a potentially clean fuel that could someday rival solar and wind and cut carbon from the atmosphere. Last week, California’s hub, a public-private partnership called ARCHES, became the first to negotiate an agreement with the Department of Energy to build out hydrogen power plants, pipelines, and other projects.  But researchers and community advocates warn that unless the federal government’s so-called hydrogen earthshot has adequate safeguards, it could worsen air pollution in vulnerable communities and aggravate a warming climate. They’re also concerned that specifics of the emerging efforts remain stubbornly secret from people who live near shovel-ready projects. That’s true even in California, a state that has declared a commitment not only to ambitious climate goals but also to environmental justice.  “The people got left behind in this conversation,” said Fatima Abdul-Khabir, the Energy Equity Program manager at Oakland-based Greenlining Institute, an advocacy group. “It’s a massive step backwards.” Hydrogen, a colorless, odorless gas, is the world’s most abundant chemical element. When it’s used in fuel cells or burned for energy, it generates no atmosphere-warming carbon emissions. That means it could power trucks and airplanes without spewing soot from a tailpipe or exhaust from an engine. Hydrogen could help steel plants and other heavy industries lower their carbon footprints.  A hydrogen engine on display at the technology conference CERAWeek in Houston, Texas in 2023. Chen Chen/Xinhua via Getty Images But stripping hydrogen molecules from water or methane to use as fuel can be expensive and complicated, and if that process relies on fossil fuels, it could actually prolong climate pollution. That’s not the only health risk: When even cleanly-produced hydrogen is blended with methane and burned, it can still dirty the air with toxic byproducts that contribute to lung-irritating smog.  The nation’s hydrogen earthshot is a risky and ambitious bet. Congress created an $8 billion pot of money for the hub system. It also tucked nearly $18 billion in grants and incentives into the Inflation Reduction Act and the infrastructure bill. An uncapped federal tax credit for companies that produce hydrogen energy could cost the public at least another $100 billion.  “There’s so much hype right now for hydrogen because everybody wants a piece of the pie,” said Dan Esposito, an electricity policy analyst at the nonprofit firm Energy Innovation.  To bring clean hydrogen to market as quickly as possible, the U.S. Department of Energy selected regional hubs based in part on their ability to quickly produce and find uses for clean hydrogen. The chosen hubs also must promise jobs and other community benefits that advance federal environmental justice goals.  But California’s hub, a public-private partnership called ARCHES, is rejecting rules the federal government has proposed to help guard against the risk of rising pollution from incautious hydrogen projects. Along with the six other hubs, ARCHES signed a letter that warns of “far reaching negative consequences” if the rules are made permanent. The Biden administration has set aside billions of dollars in grants, incentives, and tax credits for companies investing in new hydrogen energy. Anna Moneymaker/Getty Images The position held by ARCHES is directly contrary to that of experts who say such rules are the only guarantee that this huge investment will lead to a sustainable hydrogen economy.  “What our research has shown is that if we do this wrong from the start, either the hydrogen industry will fall apart or it’s going to lose a bunch of public support or it will really significantly delay our ability to clean up the power grid,” Esposito said.  Multiple analyses based on public data and modeling, including Esposito’s own, have concluded that hydrogen produced under the wrong circumstances could worsen air pollution instead of improving it.  So far, the message from ARCHES is: Trust us. Trust California to do what is right with the $1.2 billion it has been awarded for its hub. Trust the hub’s projects to cut carbon and lung-searing emissions from the air.  “There’s reason to trust California,” said Dan Kammen, an energy professor at the University of California, Berkeley. “But only if California continues to follow the rules that California created.” California’s hub began as an agreement among the Governor’s Office of Business and Economic Development, or GO-BIZ, the University of California, the state building and trades unions and a nonprofit called Renewables 100, founded by ARCHES CEO Angelina Galiteva. It has around 400 network partners, including Amazon, Cemex, Chevron and investor-owned utilities, including SoCal Gas and Edison International. Building on the state’s development of the world’s first standard to cut the carbon intensity of fuel, ARCHES promises to develop zero-carbon hydrogen using solar, wind, biomass and other renewable sources.  “We came together to go after the federal funding, but that federal funding is just a start,” said Tyson Eckerle, a senior advisor for GO BIZ, at an environmental think tank’s conference in the spring. “It’s the pebble that launches the avalanche.” But California argues that its progress will be slowed if hydrogen developers have to meet rules the U.S. Department of the Treasury has proposed for projects seeking the lucrative 45V tax credit.   Angelina Galiteva is CEO of California’s hydrogen hub, which is the first in the country to negotiate terms with the U.S. Department of Energy for a billion-dollar award. Courtesy of the California Hydrogen Leadership Summit Those rules are based on what energy experts refer to as the “three pillars” of clean hydrogen production. To make hydrogen clean and sustainable, it should be produced from a new source using carbon-neutral electricity. That electricity should be geographically close to where it’s needed, so delivering it isn’t costly. It should also be available when it’s needed, not traded or obtained through accounting from another time and place.  California’s hydrogen leaders counter that the state already has a successful strategy — and numerous requirements — for getting clean energy on the grid. Complying with the federal rules would undermine that progress, ARCHES has said in a public response, making it “impossible” to integrate hydrogen “in a timely and cost-effect manner without disrupting our carefully calibrated energy system.” “We’re at almost 60 percent, 24/7 renewables across the board, which is a huge, huge step forward. We’re ahead of our goals in terms of meeting those obligations,” Galiteva told Public Health Watch.  If these federal conditions “had been required for the nascent solar or battery or any other industry, those industries would never have taken off,” she said.  Julie McNamara, a senior energy analyst at the Union of Concerned Scientists, called California’s position contradictory. Even if the state’s renewables-rich grid deserves freedom from constraining rules, why would California support a free-for-all that gives states that continue to depend on fossil fuels a pass?  “ARCHES is trying to have it both ways,” she said.  Fossil fuel-focused energy companies, including BP and Shell, have also argued for more leeway in qualifying for the federal money.  Clean hydrogen could be the angel of decarbonizing the energy sector, but Earthjustice senior research and policy analyst Sasan Saadat said that poorly defined hydrogen could be the devil, because it might prolong the use of fossil fuels.  “You’ve taken this thing that is really dangerous and muddled it up with the world of climate solutions and clean energy and that’s why it’s so risky,” Saadat said. “The fossil fuel industry knows this and they can blur the lines.” ARCHES has prioritized 37 projects to spend its federal money, according to CEO Galiteva. This “tier one” investment reflects the hub’s vision for bringing clean hydrogen to California.  “We have another 33-plus projects … that can actually slide into a tier one project if a tier one project hits a bump on the road for any reason,” she said at a recent hydrogen trade conference in Sacramento. “So the economy and the scale is going to be pretty big once we start moving.” There’s an incentive to move quickly: To qualify for the federal tax credit, shovels have to be in the ground by 2032.  In Los Angeles County, the Element Resources Project could be one of 37 projects granted money by California’s hub, ARCHES. The city of Lancaster’s project promises to produce hydrogen fuel with solar power. Courtesy of the City of Lancaster But the criteria for what qualifies as tier one status aren’t public. Nor are the locations of most of ARCHES’ projects, or their potential health and environmental impacts.   To fully participate in the hub, partners had to sign a nondisclosure agreement. Environmental advocates call the NDA an “iron wall” that makes ARCHES a black box.  “This huge hydrogen thing is happening, and all anybody knows is that there’s a ton of money coming for it,” said Shana Lazerow, a lawyer with the nonprofit Communities for a Better Environment.  Even where hydrogen is produced without fossil fuels, enormous questions remain about where to prioritize its production and use, so it doesn’t pollute or cost more.  “No one has found the killer app for green hydrogen yet,” UC Berkeley’s Dan Kammen said.  At Valley Generating Station in Sun Valley, the Los Angeles Department of Water and Power is demolishing four red-and-white striped stacks to make way for what it says will be renewable and possibly hydrogen projects. But the facility has a history of methane leaks, and neighbors are wary of the utility’s promises. Molly Peterson/Public Health Watch Projects that might scoop up the federal money are beginning to emerge from the shadows. In eastern Contra Costa County, where land along the Suisun Bay once served as a stopover for boats supplying gold miners, a company called H Cycle is proposing to heat municipal organic waste to transform it into hydrogen. Diverting waste from a landfill is a particularly attractive idea, since overstuffed landfills release methane into the atmosphere. But the draft environmental impact report for the project in the small city of Pittsburg is light on details. It’s not clear exactly what will be heated or what technology will be used to unlock the hydrogen. Under California’s regulations, organic waste can include some percentage of plastic and metal, which would emit toxins when burned. The report also references slag, a waste product that comes from burning material, not just heating it.  All of that is troubling to a neighborhood whose residents are in the 93rd percentile statewide for asthma risk. Charles Davidson, a Contra Costa resident and member of the Sunflower Alliance, points out that 25,000 people live near H Cycle. “It’s burning plastics and construction materials and other things with no limit, no specifications on what’s being incinerated next to people’s homes,” he said.  A news release says H Cycle “is positioned” for a piece of ARCHES’ billion-dollar pie. But whether it’s a tier-one project for the hub isn’t clear. H Cycle, as a partner in ARCHES, has signed the hub’s non-disclosure agreement, and the company did not respond to requests for comment.  A letter local air regulators sent to Pittsburg’s planners warns of health risks from the project.  “This thermal conversion process represents a novel renewable hydrogen production strategy,” wrote the Bay Area Air Quality Management District in March. “However, it will introduce additional air pollution into a community that is already overburdened.” The district recommended more consideration of residents – and more transparency. H Cycle’s engagement with vulnerable communities is limited at best, said Amelia Keyes, a lawyer with Communities for a Better Environment.  “It’s no coincidence that a polluting facility like this is being built here,” she said.  At launch, ARCHES highlighted 10 unnamed hydrogen production projects, “with most in the Central Valley.”  Projects are popping up in marginalized or already-polluted communities around the state. Some involve producing the fuel; others will transport or use it. Amelia Keyes said advocates usually hear about these projects by word of mouth.  “I think it really illustrates the kind of Whac-a-mole that environmental justice groups have to play with these kinds of facilities,” Keyes said.  At the port of Stockton, there’s talk of a facility that would produce hydrogen by steaming it out of methane but could claim to be carbon neutral by using credits for reductions of pollution elsewhere. In a farmworker community in western Fresno County, a pilot project will blend hydrogen into gas lines that go directly into homes for 10,000 people. Southern California Gas is floating the idea of AngelesLink. It’s billed as the nation’s largest clean hydrogen pipeline and could pipe the stuff into the Los Angeles basin. But little information is available yet about where clean fuel will come from in the first place.  Pressure gauges on a hydrogen storage facility at the National Renewable Energy Laboratory in Colorado. Chet Strange for The Washington Post via Getty Images Major environmental groups, including Communities for a Better Environment, complain they don’t know much about these projects because they didn’t sign the ARCHES NDA, fearing that the secrecy required would compromise their advocacy in public processes. They worry that health risks and the influence of fossil fuel companies are being waved away.   In a letter to federal energy officials, the California Environmental Justice Association called the NDA a “delay tactic that allowed ARCHES to move forward without needing to account for and include impacted communities in decision-making.” “Why should we as the public be living in this poverty of information about a massive taxpayer funded climate program?” said Earthjustice energy analyst Sasan Saadat. “It’s really galling.”  People in environmental justice communities are exactly who the California hub claims will benefit from the hydrogen boom. ARCHES says its overall proposal could help the state save nearly $3 billion by increasing “the economic value of health-related benefits” and creating 220,000 new jobs.  In a brief on its website, ARCHES attributes the potential health savings to cleaner air, based on a research paper commissioned by the California Public Utilities Commission. That paper projects reductions in air pollution through the electrification of cars and trucks, ending the use of natural gas in buildings, and removing all emissions from natural gas power generation. It then models the anticipated public health benefits from each. But hydrogen is only glancingly mentioned. As for the jobs estimate, the independent think tank Rhodium Group offers a stark counter-estimate. It suggests that California’s hub will create just 6,000 to 8,000 jobs during the construction phase and only several hundred long term.  Neighborhoods that might be affected by hydrogen development tend to be wary of promises of jobs or cleaner air. That’s particularly true in the Los Angeles basin, where people have long breathed fossil-fuel driven pollution from refineries and natural gas plants. Now the L.A. Department of Water and Power plans to retrofit one of those plants, the Scattergood Generating Station, so it can run on methane mixed with hydrogen. The plant would produce power to serve the region when demand peaks, as it does on hot days. The estimated cost to retrofit two of the plant’s three turbines is at least $800 million.  A view of the backside of the Scattergood Generating Station, which the L.A. Department of Water and Power plans to retrofit so it can run on methane mixed with hydrogen. Jay L. Clendenin / Los Angeles Times via Getty Images But hydrogen burned at high temperatures where oxygen is present, as in a gas plant, can create nitrogen oxides; those, in turn, contribute to ground-level ozone, or smog. Emerging science suggests that blending hydrogen into fossil gas could even increase those emissions, unless pollution controls are added.  “We should not be shooting for extending the life of combustion technology,” Earthjustice analyst Saadat said. “We know that we need to stop burning fuel at the tailpipe and the smokestack.” ARCHES and the Los Angeles Department of Water and Power plan to transition Scattergood to 100 percent hydrogen — “as soon as it is technically and practically feasible to do so.” In the meantime, state officials have acknowledged that the continuing transformation of California’s energy economy comes with tradeoffs. “Not everything is going to be zero all of the time in terms of emissions,” Rajinder Sahota, deputy executive officer for climate change at the California Air Resources Board, said at the  hydrogen summit in Sacramento. “But making sure that, cumulatively, the exposure to harmful pollution is reduced is going to be important.”  The L.A. Department of Water and Power, or LADWP, is also “actively exploring” what happens next at its Valley Generating Station in Sun Valley. Valley notoriously leaked methane, which contributes to smog, for at least three years before officials notified anyone living nearby. The leak prompted a campaign by residents of the largely Latino neighborhood to shut Valley down, and water and power officials say demolition will soon begin. But the 12-acre property remains connected to gas infrastructure, and LADWP emphasizes that having dependable energy generated near where it’s needed in the L.A. basin is essential to a cleaner energy future.  An LADWP spokeswoman said the utility “is actively evaluating hydrogen as well as other emerging technologies [at Valley] that will maximize environmental and equity benefits. We have consistently engaged the community and will continue to do so.”  But residents aren’t reassured.  “So far it’s been hard to understand, Why this? Why this technology?” said Miguel Miguel, a policy advisor for the community advocacy group Pacoima Beautiful.  Molly Peterson/Public Health Watch Miguel says the opaqueness about Valley’s future helped push California environmental justice advocates to circulate principles for an equitable energy transition to hydrogen last year. By their definition, green hydrogen relies on surplus water and renewable energy and doesn’t keep fossil fuels online. It also means communities are consulted respectfully from the start. “There’s a possibility of green hydrogen as long as it doesn’t exacerbate problems,” Miguel said. “But for us, at Valley … in our opinion it’s the natural gas industry’s last-ditch effort to say, ‘You still need us.’ And that’s the hardest pill to swallow.” Advocates like Miguel acknowledge that balancing Southern California’s energy sources responsibly, to avoid brownouts or skyrocketing costs, isn’t easy. That’s why they oppose dirty hydrogen — not all hydrogen.  But Martha Dina Arguello, the executive director of Physicians for Social Responsibility-Los Angeles, says talk of green hydrogen has left her frustrated.  “You realize that nobody wants to make green hydrogen, right? There’s no profit in making green hydrogen,” she said. “The political reality is that nobody’s building that right now.” In the coming months, federal agencies will set policies that clarify the direction ARCHES and the other hydrogen hubs will take.  When Energy Department ARCHES funding, it also finalized the hub’s operating rules. The Treasury Department, too, must finalize guidelines for companies wishing to access hydrogen tax credits. The two agencies don’t always agree; Politico has reported that some in the DOE were advocating internally for weaker rules, as many industry leaders have sought.  Meanwhile, California lawmakers are considering legislation that would streamline the state’s  environmental review process for hydrogen projects. And some Democratic members of California’s congressional delegation are lobbying Treasury for weaker rules.  California’s hydrogen boosters seem confident about their strategy.  “Frankly, if you want green hydrogen to succeed, you need California,” ARCHES CEO Galiteva said at the Sacramento summit. She told a story about how Gov. Gavin Newsom sold federal officials on the state’s capacity to advance clean fuel.  Galiteva said the governor emphasized California’s strong climate goals and its robust marketplace for clean energy. And his pitch didn’t stop there.   “You need us more than we need you,” Newsom, by her account, told the DOE. “So you’d better give us a hub.”  Laughter erupted in a ballroom of industry representatives and public officials, as Galiteva smiled. “I guess they listened,” she said. This story was originally published by Grist with the headline As US bets big on hydrogen for clean energy, local communities worry about secrecy and public health on Jul 29, 2024.

The Biden administration has set aside billions of dollars for new hydrogen energy. But does the industry need better safeguards?

Billions of dollars in public money are beginning to flow to seven “hydrogen hubs” around the country — regional nerve centers for a potentially clean fuel that could someday rival solar and wind and cut carbon from the atmosphere. Last week, California’s hub, a public-private partnership called ARCHES, became the first to negotiate an agreement with the Department of Energy to build out hydrogen power plants, pipelines, and other projects. 

But researchers and community advocates warn that unless the federal government’s so-called hydrogen earthshot has adequate safeguards, it could worsen air pollution in vulnerable communities and aggravate a warming climate. They’re also concerned that specifics of the emerging efforts remain stubbornly secret from people who live near shovel-ready projects.

That’s true even in California, a state that has declared a commitment not only to ambitious climate goals but also to environmental justice. 

“The people got left behind in this conversation,” said Fatima Abdul-Khabir, the Energy Equity Program manager at Oakland-based Greenlining Institute, an advocacy group. “It’s a massive step backwards.”

Hydrogen, a colorless, odorless gas, is the world’s most abundant chemical element. When it’s used in fuel cells or burned for energy, it generates no atmosphere-warming carbon emissions. That means it could power trucks and airplanes without spewing soot from a tailpipe or exhaust from an engine. Hydrogen could help steel plants and other heavy industries lower their carbon footprints. 

A hydrogen engine on display at the technology conference CERAWeek in Houston, Texas in 2023. Chen Chen/Xinhua via Getty Images

But stripping hydrogen molecules from water or methane to use as fuel can be expensive and complicated, and if that process relies on fossil fuels, it could actually prolong climate pollution. That’s not the only health risk: When even cleanly-produced hydrogen is blended with methane and burned, it can still dirty the air with toxic byproducts that contribute to lung-irritating smog. 

The nation’s hydrogen earthshot is a risky and ambitious bet. Congress created an $8 billion pot of money for the hub system. It also tucked nearly $18 billion in grants and incentives into the Inflation Reduction Act and the infrastructure bill. An uncapped federal tax credit for companies that produce hydrogen energy could cost the public at least another $100 billion. 

“There’s so much hype right now for hydrogen because everybody wants a piece of the pie,” said Dan Esposito, an electricity policy analyst at the nonprofit firm Energy Innovation. 

To bring clean hydrogen to market as quickly as possible, the U.S. Department of Energy selected regional hubs based in part on their ability to quickly produce and find uses for clean hydrogen. The chosen hubs also must promise jobs and other community benefits that advance federal environmental justice goals

But California’s hub, a public-private partnership called ARCHES, is rejecting rules the federal government has proposed to help guard against the risk of rising pollution from incautious hydrogen projects. Along with the six other hubs, ARCHES signed a letter that warns of “far reaching negative consequences” if the rules are made permanent.

The Biden administration has set aside billions of dollars in grants, incentives, and tax credits for companies investing in new hydrogen energy. Anna Moneymaker/Getty Images

The position held by ARCHES is directly contrary to that of experts who say such rules are the only guarantee that this huge investment will lead to a sustainable hydrogen economy. 

“What our research has shown is that if we do this wrong from the start, either the hydrogen industry will fall apart or it’s going to lose a bunch of public support or it will really significantly delay our ability to clean up the power grid,” Esposito said. 

Multiple analyses based on public data and modeling, including Esposito’s own, have concluded that hydrogen produced under the wrong circumstances could worsen air pollution instead of improving it. 

So far, the message from ARCHES is: Trust us. Trust California to do what is right with the $1.2 billion it has been awarded for its hub. Trust the hub’s projects to cut carbon and lung-searing emissions from the air. 

“There’s reason to trust California,” said Dan Kammen, an energy professor at the University of California, Berkeley. “But only if California continues to follow the rules that California created.”


California’s hub began as an agreement among the Governor’s Office of Business and Economic Development, or GO-BIZ, the University of California, the state building and trades unions and a nonprofit called Renewables 100, founded by ARCHES CEO Angelina Galiteva. It has around 400 network partners, including Amazon, Cemex, Chevron and investor-owned utilities, including SoCal Gas and Edison International.

Building on the state’s development of the world’s first standard to cut the carbon intensity of fuel, ARCHES promises to develop zero-carbon hydrogen using solar, wind, biomass and other renewable sources. 

“We came together to go after the federal funding, but that federal funding is just a start,” said Tyson Eckerle, a senior advisor for GO BIZ, at an environmental think tank’s conference in the spring. “It’s the pebble that launches the avalanche.”

But California argues that its progress will be slowed if hydrogen developers have to meet rules the U.S. Department of the Treasury has proposed for projects seeking the lucrative 45V tax credit.  

Angelina Galiteva is CEO of California’s hydrogen hub, which is the first in the country to negotiate terms with the U.S. Department of Energy for a billion-dollar award. Courtesy of the California Hydrogen Leadership Summit

Those rules are based on what energy experts refer to as the “three pillars” of clean hydrogen production. To make hydrogen clean and sustainable, it should be produced from a new source using carbon-neutral electricity. That electricity should be geographically close to where it’s needed, so delivering it isn’t costly. It should also be available when it’s needed, not traded or obtained through accounting from another time and place. 

California’s hydrogen leaders counter that the state already has a successful strategy — and numerous requirements — for getting clean energy on the grid. Complying with the federal rules would undermine that progress, ARCHES has said in a public response, making it “impossible” to integrate hydrogen “in a timely and cost-effect manner without disrupting our carefully calibrated energy system.”

“We’re at almost 60 percent, 24/7 renewables across the board, which is a huge, huge step forward. We’re ahead of our goals in terms of meeting those obligations,” Galiteva told Public Health Watch. 

If these federal conditions “had been required for the nascent solar or battery or any other industry, those industries would never have taken off,” she said. 

Julie McNamara, a senior energy analyst at the Union of Concerned Scientists, called California’s position contradictory. Even if the state’s renewables-rich grid deserves freedom from constraining rules, why would California support a free-for-all that gives states that continue to depend on fossil fuels a pass? 

“ARCHES is trying to have it both ways,” she said. 

Fossil fuel-focused energy companies, including BP and Shell, have also argued for more leeway in qualifying for the federal money. 

Clean hydrogen could be the angel of decarbonizing the energy sector, but Earthjustice senior research and policy analyst Sasan Saadat said that poorly defined hydrogen could be the devil, because it might prolong the use of fossil fuels. 

“You’ve taken this thing that is really dangerous and muddled it up with the world of climate solutions and clean energy and that’s why it’s so risky,” Saadat said. “The fossil fuel industry knows this and they can blur the lines.”


ARCHES has prioritized 37 projects to spend its federal money, according to CEO Galiteva. This “tier one” investment reflects the hub’s vision for bringing clean hydrogen to California. 

“We have another 33-plus projects … that can actually slide into a tier one project if a tier one project hits a bump on the road for any reason,” she said at a recent hydrogen trade conference in Sacramento. “So the economy and the scale is going to be pretty big once we start moving.”

There’s an incentive to move quickly: To qualify for the federal tax credit, shovels have to be in the ground by 2032. 

In Los Angeles County, the Element Resources Project could be one of 37 projects granted money by California’s hub, ARCHES. The city of Lancaster’s project promises to produce hydrogen fuel with solar power. Courtesy of the City of Lancaster

But the criteria for what qualifies as tier one status aren’t public. Nor are the locations of most of ARCHES’ projects, or their potential health and environmental impacts.  

To fully participate in the hub, partners had to sign a nondisclosure agreement. Environmental advocates call the NDA an “iron wall” that makes ARCHES a black box. 

“This huge hydrogen thing is happening, and all anybody knows is that there’s a ton of money coming for it,” said Shana Lazerow, a lawyer with the nonprofit Communities for a Better Environment. 

Even where hydrogen is produced without fossil fuels, enormous questions remain about where to prioritize its production and use, so it doesn’t pollute or cost more. 

“No one has found the killer app for green hydrogen yet,” UC Berkeley’s Dan Kammen said. 

At Valley Generating Station in Sun Valley, the Los Angeles Department of Water and Power is demolishing four red-and-white striped stacks to make way for what it says will be renewable and possibly hydrogen projects. But the facility has a history of methane leaks, and neighbors are wary of the utility’s promises. Molly Peterson/Public Health Watch

Projects that might scoop up the federal money are beginning to emerge from the shadows. In eastern Contra Costa County, where land along the Suisun Bay once served as a stopover for boats supplying gold miners, a company called H Cycle is proposing to heat municipal organic waste to transform it into hydrogen. Diverting waste from a landfill is a particularly attractive idea, since overstuffed landfills release methane into the atmosphere.

But the draft environmental impact report for the project in the small city of Pittsburg is light on details. It’s not clear exactly what will be heated or what technology will be used to unlock the hydrogen. Under California’s regulations, organic waste can include some percentage of plastic and metal, which would emit toxins when burned. The report also references slag, a waste product that comes from burning material, not just heating it. 

All of that is troubling to a neighborhood whose residents are in the 93rd percentile statewide for asthma risk. Charles Davidson, a Contra Costa resident and member of the Sunflower Alliance, points out that 25,000 people live near H Cycle. “It’s burning plastics and construction materials and other things with no limit, no specifications on what’s being incinerated next to people’s homes,” he said. 

A news release says H Cycle “is positioned” for a piece of ARCHES’ billion-dollar pie. But whether it’s a tier-one project for the hub isn’t clear. H Cycle, as a partner in ARCHES, has signed the hub’s non-disclosure agreement, and the company did not respond to requests for comment. 

A letter local air regulators sent to Pittsburg’s planners warns of health risks from the project. 

“This thermal conversion process represents a novel renewable hydrogen production strategy,” wrote the Bay Area Air Quality Management District in March. “However, it will introduce additional air pollution into a community that is already overburdened.” The district recommended more consideration of residents – and more transparency.

H Cycle’s engagement with vulnerable communities is limited at best, said Amelia Keyes, a lawyer with Communities for a Better Environment. 

“It’s no coincidence that a polluting facility like this is being built here,” she said. 


At launch, ARCHES highlighted 10 unnamed hydrogen production projects, “with most in the Central Valley.” 

Projects are popping up in marginalized or already-polluted communities around the state. Some involve producing the fuel; others will transport or use it. Amelia Keyes said advocates usually hear about these projects by word of mouth. 

“I think it really illustrates the kind of Whac-a-mole that environmental justice groups have to play with these kinds of facilities,” Keyes said. 

At the port of Stockton, there’s talk of a facility that would produce hydrogen by steaming it out of methane but could claim to be carbon neutral by using credits for reductions of pollution elsewhere. In a farmworker community in western Fresno County, a pilot project will blend hydrogen into gas lines that go directly into homes for 10,000 people. Southern California Gas is floating the idea of AngelesLink. It’s billed as the nation’s largest clean hydrogen pipeline and could pipe the stuff into the Los Angeles basin. But little information is available yet about where clean fuel will come from in the first place. 

Pressure gauges on a hydrogen storage facility at the National Renewable Energy Laboratory in Colorado. Chet Strange for The Washington Post via Getty Images

Major environmental groups, including Communities for a Better Environment, complain they don’t know much about these projects because they didn’t sign the ARCHES NDA, fearing that the secrecy required would compromise their advocacy in public processes. They worry that health risks and the influence of fossil fuel companies are being waved away.  

In a letter to federal energy officials, the California Environmental Justice Association called the NDA a “delay tactic that allowed ARCHES to move forward without needing to account for and include impacted communities in decision-making.”

“Why should we as the public be living in this poverty of information about a massive taxpayer funded climate program?” said Earthjustice energy analyst Sasan Saadat. “It’s really galling.” 


People in environmental justice communities are exactly who the California hub claims will benefit from the hydrogen boom. ARCHES says its overall proposal could help the state save nearly $3 billion by increasing “the economic value of health-related benefits” and creating 220,000 new jobs. 

In a brief on its website, ARCHES attributes the potential health savings to cleaner air, based on a research paper commissioned by the California Public Utilities Commission. That paper projects reductions in air pollution through the electrification of cars and trucks, ending the use of natural gas in buildings, and removing all emissions from natural gas power generation. It then models the anticipated public health benefits from each. But hydrogen is only glancingly mentioned.

As for the jobs estimate, the independent think tank Rhodium Group offers a stark counter-estimate. It suggests that California’s hub will create just 6,000 to 8,000 jobs during the construction phase and only several hundred long term. 

Neighborhoods that might be affected by hydrogen development tend to be wary of promises of jobs or cleaner air. That’s particularly true in the Los Angeles basin, where people have long breathed fossil-fuel driven pollution from refineries and natural gas plants. Now the L.A. Department of Water and Power plans to retrofit one of those plants, the Scattergood Generating Station, so it can run on methane mixed with hydrogen. The plant would produce power to serve the region when demand peaks, as it does on hot days. The estimated cost to retrofit two of the plant’s three turbines is at least $800 million. 

A view of the backside of the Scattergood Generating Station, which the L.A. Department of Water and Power plans to retrofit so it can run on methane mixed with hydrogen. Jay L. Clendenin / Los Angeles Times via Getty Images

But hydrogen burned at high temperatures where oxygen is present, as in a gas plant, can create nitrogen oxides; those, in turn, contribute to ground-level ozone, or smog. Emerging science suggests that blending hydrogen into fossil gas could even increase those emissions, unless pollution controls are added. 

“We should not be shooting for extending the life of combustion technology,” Earthjustice analyst Saadat said. “We know that we need to stop burning fuel at the tailpipe and the smokestack.”

ARCHES and the Los Angeles Department of Water and Power plan to transition Scattergood to 100 percent hydrogen — “as soon as it is technically and practically feasible to do so.” In the meantime, state officials have acknowledged that the continuing transformation of California’s energy economy comes with tradeoffs.

“Not everything is going to be zero all of the time in terms of emissions,” Rajinder Sahota, deputy executive officer for climate change at the California Air Resources Board, said at the  hydrogen summit in Sacramento. “But making sure that, cumulatively, the exposure to harmful pollution is reduced is going to be important.” 

The L.A. Department of Water and Power, or LADWP, is also “actively exploring” what happens next at its Valley Generating Station in Sun Valley. Valley notoriously leaked methane, which contributes to smog, for at least three years before officials notified anyone living nearby. The leak prompted a campaign by residents of the largely Latino neighborhood to shut Valley down, and water and power officials say demolition will soon begin. But the 12-acre property remains connected to gas infrastructure, and LADWP emphasizes that having dependable energy generated near where it’s needed in the L.A. basin is essential to a cleaner energy future. 

An LADWP spokeswoman said the utility “is actively evaluating hydrogen as well as other emerging technologies [at Valley] that will maximize environmental and equity benefits. We have consistently engaged the community and will continue to do so.” 

But residents aren’t reassured. 

“So far it’s been hard to understand, Why this? Why this technology?” said Miguel Miguel, a policy advisor for the community advocacy group Pacoima Beautiful. 

Molly Peterson/Public Health Watch

Miguel says the opaqueness about Valley’s future helped push California environmental justice advocates to circulate principles for an equitable energy transition to hydrogen last year. By their definition, green hydrogen relies on surplus water and renewable energy and doesn’t keep fossil fuels online. It also means communities are consulted respectfully from the start.

“There’s a possibility of green hydrogen as long as it doesn’t exacerbate problems,” Miguel said. “But for us, at Valley … in our opinion it’s the natural gas industry’s last-ditch effort to say, ‘You still need us.’ And that’s the hardest pill to swallow.”

Advocates like Miguel acknowledge that balancing Southern California’s energy sources responsibly, to avoid brownouts or skyrocketing costs, isn’t easy. That’s why they oppose dirty hydrogen — not all hydrogen. 

But Martha Dina Arguello, the executive director of Physicians for Social Responsibility-Los Angeles, says talk of green hydrogen has left her frustrated. 

“You realize that nobody wants to make green hydrogen, right? There’s no profit in making green hydrogen,” she said. “The political reality is that nobody’s building that right now.”


In the coming months, federal agencies will set policies that clarify the direction ARCHES and the other hydrogen hubs will take. 

When Energy Department ARCHES funding, it also finalized the hub’s operating rules. The Treasury Department, too, must finalize guidelines for companies wishing to access hydrogen tax credits. The two agencies don’t always agree; Politico has reported that some in the DOE were advocating internally for weaker rules, as many industry leaders have sought. 

Meanwhile, California lawmakers are considering legislation that would streamline the state’s  environmental review process for hydrogen projects. And some Democratic members of California’s congressional delegation are lobbying Treasury for weaker rules. 

California’s hydrogen boosters seem confident about their strategy. 

“Frankly, if you want green hydrogen to succeed, you need California,” ARCHES CEO Galiteva said at the Sacramento summit. She told a story about how Gov. Gavin Newsom sold federal officials on the state’s capacity to advance clean fuel. 

Galiteva said the governor emphasized California’s strong climate goals and its robust marketplace for clean energy. And his pitch didn’t stop there.  

“You need us more than we need you,” Newsom, by her account, told the DOE. “So you’d better give us a hub.” 

Laughter erupted in a ballroom of industry representatives and public officials, as Galiteva smiled. “I guess they listened,” she said.

This story was originally published by Grist with the headline As US bets big on hydrogen for clean energy, local communities worry about secrecy and public health on Jul 29, 2024.

Read the full story here.
Photos courtesy of

Fears of Massive Battery Fires Spark Local Opposition to Energy Storage Projects

Lithium-ion batteries are increasingly being used to store power for electrical grids, but some localities are concerned about fire risks

More and more, big arrays of lithium-ion batteries are being hooked up to electrical grids around the U.S. to store power that can be discharged in times of high demand.But as more energy storage is added, residents in some places are pushing back due to fears that the systems will go up in flames, as a massive facility in California did earlier this year.Proponents maintain that state-of-the-art battery energy storage systems are safe, but more localities are enacting moratoriums.“We’re not guinea pigs for anybody ... we are not going to experiment, we’re not going to take risk,” said Michael McGinty, the mayor of Island Park, New York, which passed a moratorium in July after a storage system was proposed near the village line.At least a few dozen localities around the United States have moved to temporarily block development of big battery systems in recent years.Long Island, where the power grid could get a boost in the next few years as offshore wind farms come online, has been a hotbed of activism, even drawing attention recently from the Trump administration. Opponents there got a boost in August when Environmental Protection Agency Administrator Lee Zeldin visited New York to complain that the state was rushing approvals of sites in order to meet “delusional” green power goals — a claim state officials deny.Battery energy storage systems that suck up cheap power during periods of low demand, then discharge it at a profit during periods of high demand, are considered critical with the rise of intermittent energy sources such as wind and solar.Known by the acronym BESS, the systems can make grids more reliable and have been credited with reducing blackouts. A large battery system might consist of rows of shipping containers in a fenced lot, with the containers holding hundreds of thousands of cells.China and the United States lead the world in rapidly adding battery storage energy systems. However, Saudi Arabia, South Africa, Australia, Netherlands, Chile, Canada and the U.K. have commissioned or started construction on large projects since 2024, too, according to research from BloombergNEF.In the U.S., California and Texas have been leaders in battery storage. But other states are moving quickly, often with privately developed systems. While the Trump administration has been unsupportive or even hostile to renewable energy, key tax credits for energy storage projects were maintained in the recently approved federal budget for qualified projects that begin construction in the next eight years.Developers added 4,908 megawatts of battery storage capacity in the second quarter of 2025, with Arizona, California and Texas accounting for about three-quarters of that new capacity, according to a report from American Clean Power Association, an industry group. That’s enough to power nearly 1.7 million households.New York has an ambitious goal to add 6,000 megawatts of energy storage by 2030, half of it large-scale systems.Opposition to the storage systems usually focuses on the possibility of thermal runaway, a chain reaction of uncontrolled heating that can lead to fire or an explosion. Opponents point to past fires and ask: What if that happens in my neighborhood?A battery storage system in Moss Landing, California caught fire in January, sending plumes of toxic smoke into the atmosphere and forcing the evacuation of about 1,500 people..Experts in the field say battery systems have become safer over the years. Ofodike Ezekoye, a combustion expert and professor of mechanical engineering at The University of Texas at Austin, notes that failures are relatively infrequent, but also that no engineered system is 100% foolproof.“This is a relatively immature technology that is maturing quickly, so I think that there are a lot of really thoughtful researchers and other stakeholders who are trying to improve the overall safety of these systems,” Ezekoye said.Battery storage proponents say a facility like Moss Landing, where batteries were stored indoors, would not be allowed in New York, which has adopted fire codes that require modular enclosure design with required minimum spacing to keep fires from spreading.People who live near proposed sites are not always assured.In Washington state, the city of Maple Valley approved a six-month moratorium in July as a way “to protect us until we know more,” said city manager Laura Philpot.Voters in Halstead, Kansas, which has a moratorium, will be asked this Election Day whether they want to prohibit larger battery storage systems inside the city limits, according to Mayor Dennis Travis. He hopes the city can one day host a safely designed storage system, and said local opponents wrongly fixate on the California fire.The number of localities passing moratoriums began rising in 2023 and 2024, mirroring trends in battery storage deployment, with a notable cluster in New York, according to a presentation last year by the Pacific Northwest National Laboratory.Winnie Sokolowski is among area residents against a proposed 250-megawatt lithium-ion storage system in the Town of Ulster, New York, contending it is too close to schools and homes.“They’re banking on nothing happening, but I don’t think you can place it where they’re proposing and assume nothing’s going to happen,” Sokolowski said. “It’s just too risky if it does.”The developer, Terra-Gen, said the design will keep a fire from spreading and that the system “poses no credible, scientific-based threat to neighbors, the public or the environment.”New York State Energy Research and Development Authority President Doreen Harris said she's confident the state has the right safety rules in place, and that scaling up the use of battery storage systems will “strengthen and modernize our grid.”She noted there also were local concerns in the early stages of siting solar farms, which have since proven their benefits.Associated Press writer Jennifer McDermott in Providence, Rhode Island, contributed to this report.Copyright 2025 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.Photos You Should See – Sept. 2025

Trump administration moves to terminate $400M in energy grants in Oregon

The cancellations will impact major transmission upgrades, energy-efficiency projects, workforce development and clean technology manufacturing across the state.

The U.S. Department of Energy is canceling more than $400 million in energy grants in Oregon, a move that will slow or halt major transmission upgrades, energy-efficiency projects, workforce development and clean technology manufacturing across the state. The list of terminated grants, published Thursday by Appropriations Committee Democrats – a group of legislators who are members of the U.S. House Committee on Appropriations – includes 18 grants in Oregon totaling about $402 million. By far the largest grant on the list is $250 million for Warm Springs Power & Water Enterprises, a tribally owned utility operated by the Confederated Tribes of Warm Springs, that was slated to upgrade a 1960s-era transmission line on the Warm Springs Reservation in central Oregon. The line connects energy resources east of the Cascades to customers in the Willamette Valley. The Oregon cancellations are among $7.6 billion in energy grants that the Energy Department announced for cancellation nationwide on Wednesday night, targeting mostly Democratic states. The federal agency said the projects “did not adequately advance the nation’s energy needs, were not economically viable, and would not provide a positive return on investment of taxpayer dollars.” Critics have countered that the Trump administration is using the federal government shutdown to punish political opponents. The federal agency has not yet released an official list of affected projects nor has it notified grant recipients. The Oregon Department of Energy said it’s aware of the cancellations but could not confirm the details of individual projects or amounts. “Canceling hundreds of millions of dollars in energy projects in Oregon is a significant setback for reaching an affordable, reliable clean energy future,” said agency Director Janine Benner. “Between these actions, various supply chain issues, tariffs on components and federal agencies halting permitting even for projects not on federal lands, the federal government is making choices that may threaten reliability and will certainly increase costs for ratepayers.”According to the Appropriations Committee Democrats list, awards terminated in Oregon include several utility projects meant to strengthen the state’s aging transmission infrastructure. One of them is $50 million for Portland General Electric to deploy devices such as smart meters near homes and businesses to strengthen the grid against frequent severe weather events and deliver electricity more efficiently, leading to savings for customers, the utility confirmed.PGE’s $4.3 million grant for retrofitting buildings to lower energy costs and strengthen grid resilience, which was also to feature bill credits, cash back and free upgrades for customers, is also being terminated, as is its $4.5 million grant to upgrade parts of the Wheatridge wind-solar-battery project to maintain reliability and affordability.PGE said it’s aware of the termination announcement but has not been contacted by the federal agency. “The federal grants that PGE and partners have been awarded support critical investments in the reliability of Oregon and the region’s electrical system and help keep electricity prices as low as possible for customers,” senior vice president for strategy and advanced energy delivery Larry Bekkedahl said in a statement to The Oregonian/OregonLive. Other cancellations target clean hydrogen development in Oregon and across the region. They include $25 million to Portland-based Daimler Truck North America to develop, build and test a hydrogen fuel cell truck that significantly reduces greenhouse gas emissions and pollution. Also axed: $29.8 million to Ballard US, a Bend-based hydrogen fuel cell maker to establish a hydrogen fuel cell manufacturing facility. Neither Daimler nor Ballard could be immediately reached for comment. Another canceled project on the list is a $3.5 million grant for the Northwest Energy Efficiency Alliance to pay for training rural Oregonians – including college students, HVAC technicians and home inspectors – to meet Oregon’s energy codes. The city of Portland also will see a $1.8 million grant disappear. The money was set to pay for a pole-mounted electric vehicle charging network in public rights-of-way to provide access to affordable charging for people who live in apartment complexes or who cannot afford to install a home EV charger. Additional Oregon-based grant recipients on the termination list include: Onboard Dynamics LLC, PacifiCorp, the Crater Lake Electrical Joint Apprenticeship and Training Trust Fund, New Buildings Institute, Earth Advantage, Oregon State University and Forth Mobility Fund. Also on the termination list: a $1 billion grant for the Pacific Northwest Hydrogen Association to launch the region’s hydrogen hub, meant to jumpstart production and use of “green” hydrogen, which proponents said would create thousands of jobs and reduce emissions. Environmental groups decried the cancellations which come as the state is struggling to meet its aggressive climate mandates, including eliminating fossil energy by 2040. “Oregon needs more clean energy, not less, and taking money away from critical clean energy projects at a time of rising energy demand is bad for everyone,” said Nora Apter, Oregon Director of Climate Solutions, a Northwest-based nonprofit focused on clean energy. “It hurts our state’s ability to modernize our outdated electric grid and meet today’s rising energy demands with affordable clean energy, and Oregon families and businesses will be stuck with paying the tab.”Gov. Tina Kotek called the grant terminations part of the president’s history of prioritizing political posturing. “Once again, the Trump administration has chosen to abandon its commitment to clean energy and the American workers who depend on these promised projects, demonstrating the same shameful pattern of short-term thinking that is failing Oregon and states across the nation,” Kotek said in a statement. The U.S. Department of Energy said award recipients have 30 days to appeal a termination decision. If you purchase a product or register for an account through a link on our site, we may receive compensation. By using this site, you consent to our User Agreement and agree that your clicks, interactions, and personal information may be collected, recorded, and/or stored by us and social media and other third-party partners in accordance with our Privacy Policy.

Duke Energy backs off renewables after North Carolina cuts climate goal

When North Carolina’s GOP-led legislature nixed a key decarbonization deadline for Duke Energy in July, critics feared it would upend the state’s transition to clean energy. Now, a proposal Duke just submitted to regulators shows they were right to worry as the utility, North Carolina’s largest, seeks to walk back…

Duke’s proposed blueprint largely aligns with how experts predicted the company would behave without the 2030 deadline to curb greenhouse gas emissions. ​“This is just about what we expected,” said Will Scott, Southeast climate and clean energy director with the Environmental Defense Fund. The plan also reflects the federal government’s increasing hostility to renewable energy — and its unrelenting push to accelerate fossil-fuel use. At the same time, Trump has tried to prop up coal — the nation’s most expensive and polluting source of power — including via a Monday announcement of $625 million for the industry. As Duke notes in its plan, the administration has also relaxed other rules around carbon emissions and toxic ash from coal plants, although a future president could reverse course. Duke is responding accordingly. The company now wants to keep 4.1 gigawatts of its coal fleet running longer than it previously planned, instead of investing in proven clean-energy technology, said Mikaela Curry, manager for Sierra Club’s Beyond Coal campaign. ​“It’s just so frustrating,” she said. “It’s clear that national political sentiment is making its way into this plan,” said Brooks. ​“I don’t know what else accounts for prolonging coal, because the economics are certainly not on its side.” Before the rollback of the state climate law, cuts to federal incentives for renewables, and Trump’s particularly vicious attacks on wind energy, Duke had planned to add 13.2 gigawatts of solar and 4.5 gigawatts of onshore and offshore wind by 2035, according to the state’s nonpartisan customer advocate, Public Staff. Now, the utility envisions 9.2 gigawatts of solar — and no wind at all until at least 2040. “That’s clearly a response to political winds and not our resource winds,” Brooks said. ​“In a rational world, we’re going to have wind development in North Carolina.” The Oct. 1 blueprint from Duke is a first draft. Now, clean-energy advocates begin the arduous work of combing through the utility’s modeling assumptions and dozens of portfolios. They and other stakeholders have six months to offer written responses. The state’s Utilities Commission has until the end of next year to approve or amend Duke’s plan. With increased reliance on gas and coal sure to hit customers’ pocketbooks, critics say they’ll put rate impacts front and center. ​“We’re very sensitive to any portfolio that leaves ratepayers exposed to unnecessary fuel volatility and supply risks,” said Brooks.

Constellation Energy to Spend $340M to Improve Water Quality at Maryland's Conowingo Dam

Constellation Energy has agreed to spend more than $340 million to improve water quality from the Conowingo Dam that flows into the Susquehanna River and eventually ends up in the Chesapeake Bay

ANNAPOLIS, Md. (AP) — Constellation Energy has agreed to spend more than $340 million to improve water quality at Maryland’s Conowingo Dam, which flows into the Susquehanna River and eventually ends up in the Chesapeake Bay, the nation’s largest estuary, officials announced Thursday. The agreement clears the way for the re-licensing and continued operation of the dam’s hydroelectric facility on the Susquehanna, which is the largest source of renewable energy in Maryland. “This agreement will lead to real improvements in water quality in the biggest tributary of the Chesapeake Bay, while securing the future of one of our state’s largest clean energy producers," Gov. Wes Moore said. The agreement marks an end to wrangling over who is responsible for addressing pollution in sediment that gets stuck in the dam and ends up being released downstream and into the bay.The Maryland Department of the Environment issued an initial certification for the Conowingo Dam in 2018, but legal challenges led to a 2019 waiver of that certification and a settlement that required Constellation Energy to invest in improvements valued at $230 million. The terms were dependent on the facility’s receipt of a 50-year federal license, which it got but that was challenged by environmental groups. An appeals court vacated that license in 2022 after siding with the environmental groups who argued that Constellation’s license should require the company to mitigate the dam's water quality impacts. The deal announced Thursday was negotiated in partnership with Waterkeepers Chesapeake and Lower Susquehanna Riverkeeper Association to meet enforceable water quality standards, the governor’s office said.The terms include about $88 million for pollution reduction and resiliency initiatives, including shoreline restoration, forest buffers, fish passage projects and planting underwater grasses that produce oxygen, stabilize sediments and provide habitat for countless species. Another $78 million will be spent on trash and debris removal to add to efforts that already clear an average of about 600 tons of debris each year.It also includes funding to improve passages for fish and eels, a new freshwater mussel hatchery, invasive species management, and a study on the scientific and economic viability of dredging the dam to remove trapped sediment.A Revised Water Quality Certification will be filed with the federal government for the dam’s license to be renewed, the governor's office said. “Today’s announcement marks 16 years of tremendous effort and perseverance by our organization to assure Conowingo Dam is relicensed with proper conditions that protect the health of the Lower Susquehanna River and Chesapeake Bay,” said Lower Susquehanna Riverkeeper and Lower Susquehanna Riverkeeper Association Executive Director Ted Evgeniadis. Copyright 2025 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.Photos You Should See – Sept. 2025

Concrete “battery” developed at MIT now packs 10 times the power

Improved carbon-cement supercapacitors could turn the concrete around us into massive energy storage systems.

Concrete already builds our world, and now it’s one step closer to powering it, too. Made by combining cement, water, ultra-fine carbon black (with nanoscale particles), and electrolytes, electron-conducting carbon concrete (ec3, pronounced “e-c-cubed”) creates a conductive “nanonetwork” inside concrete that could enable everyday structures like walls, sidewalks, and bridges to store and release electrical energy. In other words, the concrete around us could one day double as giant “batteries.”As MIT researchers report in a new PNAS paper, optimized electrolytes and manufacturing processes have increased the energy storage capacity of the latest ec3 supercapacitors by an order of magnitude. In 2023, storing enough energy to meet the daily needs of the average home would have required about 45 cubic meters of ec3, roughly the amount of concrete used in a typical basement. Now, with the improved electrolyte, that same task can be achieved with about 5 cubic meters, the volume of a typical basement wall.“A key to the sustainability of concrete is the development of ‘multifunctional concrete,’ which integrates functionalities like this energy storage, self-healing, and carbon sequestration. Concrete is already the world’s most-used construction material, so why not take advantage of that scale to create other benefits?” asks Admir Masic, lead author of the new study, MIT Electron-Conducting Carbon-Cement-Based Materials Hub (EC³ Hub) co-director, and associate professor of civil and environmental engineering (CEE) at MIT.The improved energy density was made possible by a deeper understanding of how the nanocarbon black network inside ec3 functions and interacts with electrolytes. Using focused ion beams for the sequential removal of thin layers of the ec3 material, followed by high-resolution imaging of each slice with a scanning electron microscope (a technique called FIB-SEM tomography), the team across the EC³ Hub and MIT Concrete Sustainability Hub was able to reconstruct the conductive nanonetwork at the highest resolution yet. This approach allowed the team to discover that the network is essentially a fractal-like “web” that surrounds ec3 pores, which is what allows the electrolyte to infiltrate and for current to flow through the system. “Understanding how these materials ‘assemble’ themselves at the nanoscale is key to achieving these new functionalities,” adds Masic.Equipped with their new understanding of the nanonetwork, the team experimented with different electrolytes and their concentrations to see how they impacted energy storage density. As Damian Stefaniuk, first author and EC³ Hub research scientist, highlights, “we found that there is a wide range of electrolytes that could be viable candidates for ec3. This even includes seawater, which could make this a good material for use in coastal and marine applications, perhaps as support structures for offshore wind farms.”At the same time, the team streamlined the way they added electrolytes to the mix. Rather than curing ec3 electrodes and then soaking them in electrolyte, they added the electrolyte directly into the mixing water. Since electrolyte penetration was no longer a limitation, the team could cast thicker electrodes that stored more energy.The team achieved the greatest performance when they switched to organic electrolytes, especially those that combined quaternary ammonium salts — found in everyday products like disinfectants — with acetonitrile, a clear, conductive liquid often used in industry. A cubic meter of this version of ec3 — about the size of a refrigerator — can store over 2 kilowatt-hours of energy. That’s about enough to power an actual refrigerator for a day.While batteries maintain a higher energy density, ec3 can in principle be incorporated directly into a wide range of architectural elements — from slabs and walls to domes and vaults — and last as long as the structure itself.“The Ancient Romans made great advances in concrete construction. Massive structures like the Pantheon stand to this day without reinforcement. If we keep up their spirit of combining material science with architectural vision, we could be at the brink of a new architectural revolution with multifunctional concretes like ec3,” proposes Masic.Taking inspiration from Roman architecture, the team built a miniature ec3 arch to show how structural form and energy storage can work together. Operating at 9 volts, the arch supported its own weight and additional load while powering an LED light.However, something unique happened when the load on the arch increased: the light flickered. This is likely due to the way stress impacts electrical contacts or the distribution of charges. “There may be a kind of self-monitoring capacity here. If we think of an ec3 arch at architectural scale, its output may fluctuate when it’s impacted by a stressor like high winds. We may be able to use this as a signal of when and to what extent a structure is stressed, or monitor its overall health in real time,” envisions Masic.The latest developments in ec³ technology bring it a step closer to real-world scalability. It’s already been used to heat sidewalk slabs in Sapporo, Japan, due to its thermally conductive properties, representing a potential alternative to salting. “With these higher energy densities and demonstrated value across a broader application space, we now have a powerful and flexible tool that can help us address a wide range of persistent energy challenges,” explains Stefaniuk. “One of our biggest motivations was to help enable the renewable energy transition. Solar power, for example, has come a long way in terms of efficiency. However, it can only generate power when there’s enough sunlight. So, the question becomes: How do you meet your energy needs at night, or on cloudy days?”Franz-Josef Ulm, EC³ Hub co-director and CEE professor, continues the thread: “The answer is that you need a way to store and release energy. This has usually meant a battery, which often relies on scarce or harmful materials. We believe that ec3 is a viable substitute, letting our buildings and infrastructure meet our energy storage needs.” The team is working toward applications like parking spaces and roads that could charge electric vehicles, as well as homes that can operate fully off the grid.“What excites us most is that we’ve taken a material as ancient as concrete and shown that it can do something entirely new,” says James Weaver, a co-author on the paper who is an associate professor of design technology and materials science and engineering at Cornell University, as well as a former EC³ Hub researcher. “By combining modern nanoscience with an ancient building block of civilization, we’re opening a door to infrastructure that doesn’t just support our lives, it powers them.”

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