This story originally appeared on Grist and is part of the Climate Desk collaboration.

Cities looking to eliminate fossil fuels in buildings have notched a decisive court victory. Last week, a federal judge dismissed a lawsuit brought by plumbing and building trade groups against a New York City ban on natural gas in new buildings. The decision is the first to explicitly disagree with a previous ruling that struck down Berkeley, California’s first-in-the-nation gas ban. That order, issued by the 9th US Circuit Court of Appeals in 2023 and upheld again last year, prompted cities across the country to withdraw or delay laws modeled after the Berkeley ordinance.

While New York City’s law functions differently from Berkeley’s, legal experts say that this month’s decision provides strong legal footing for all types of local policies to phase out gas in buildings—and could encourage cities to once again take ambitious action.

“It’s a clear win in that regard, because the 9th Circuit decision has had a really chilling effect on local governments,” said Amy Turner, director of the Cities Climate Law Initiative at Columbia University’s Sabin Center for Climate Change Law. “Now there’s something else to point to, and a good reason for hope for local governments that may have back-burnered their building electrification plans to bring those to the forefront again.”

In 2021, New York City adopted Local Law 154, which sets an air emissions limit for indoor combustion of fuels within new buildings. Under the law, the burning of “any substance that emits 25 kilograms or more of carbon dioxide per million British thermal units of energy” is prohibited. That standard effectively bans gas-burning stoves, furnaces, and water heaters, and any other fossil-fuel powered appliances. Instead, real estate developers have to install electric appliances, like induction stoves and heat pumps. The policy went into effect in 2024 for buildings under seven stories, and will apply to taller buildings starting in 2027.

Berkeley’s law, on the other hand, banned the installation of gas piping in new construction. The first-of-its-kind policy was passed in 2019 and inspired nearly a hundred local governments across the country to introduce similar laws. But the ordinance quickly faced a lawsuit by the California Restaurant Association, which argued that gas stoves were essential for the food service industry. In April 2023, the 9th Circuit court ruled in favor of the restaurant industry, holding that federal energy efficiency standards preempted Berkeley’s policy. In January 2024, a petition by the city of Berkeley to rehear the case on the 9th Circuit was denied.

Last year’s denial of a rehearing included a detailed dissent by eight of the 29 judges on the 9th Circuit, who argued that the court’s ruling had been decided “erroneously” and “urge[d] any future court” considering the same argument “not to repeat the panel opinion’s mistakes.” Writing a dissent at all is unusual for an action as procedural as denying a rehearing, Turner noted. “It was clearly drafted to give a road map to other courts to find differently than the 9th Circuit did.”

One year later, that’s exactly what happened. In the New York City lawsuit, building industry groups and a union whose members work on gas infrastructure used the same logic that prevailed in the Berkeley case, arguing that the city’s electrification law is preempted by energy efficiency standards under the federal Energy Policy Conservation Act of 1975, or EPCA. This law sets national efficiency standards for major household appliances like furnaces, stoves, and clothes dryers. Under the law, states and cities can’t set their own energy conservation standards that would contradict federal ones. The trade groups argued that EPCA should also preempt any local laws, like New York’s, that would prevent the use of fossil fuel-powered appliances that meet national standards.

“By design, the city set that level so low as to ban all gas and oil appliances,” the groups wrote in their complaint. “The city’s gas ban thus prohibits all fuel gas appliances, violating federal law” and “presents a significant threat for businesses in New York City that sell, install, and service gas plumbing and infrastructure.”

Citing the 9th Circuit’s dissent, the US District Court for the Southern District of New York dismissed those claims. The plaintiffs’ argument broadens the scope of EPCA beyond reasonable bounds, District Judge Ronnie Abrams wrote in the court’s opinion. Regulating fuel use within certain buildings is standard practice in states and cities, she noted: New York City, for example, has banned the indoor use of kerosene space heaters for decades. “Were plaintiffs correct about the scope of EPCA, these vital safety regulations would likewise be preempted—an absurd result that the court must avoid,” Abrams wrote.

The decision could help reassure some states and cities that withdrew electrification plans after the Berkeley case, said Dror Ladin, a senior attorney at Earthjustice, a nonprofit that submitted an amicus brief on behalf of local environmental groups in the lawsuit. “This ruling demonstrates that there’s absolutely no reason to interpret the Berkeley decision so broadly,” he said. The argument brought forth by trade groups “is one that would bar a whole host of health and safety regulations, and alter the power of cities and states in a way that we’ve never seen in this country.”

By agreeing with the 9th Circuit dissent’s interpretation of EPCA, last week’s decision bolsters all types of electrification policies, including the one in New York City and those modeled after Berkeley, Turner noted. “This decision we’ve just gotten from the Southern District is more broadly protective,” she said. “Even if the air emissions route is not right for a city for whatever reason, other variations of a building electrification requirement or incentive could pass muster.”

The trade groups behind the lawsuit have said they will appeal the decision. Meanwhile, legal challenges using the same arguments brought against Berkeley’s gas ban have been launched against New York’s statewide building code and electrification policies in places like Denver, Montgomery County, Maryland, and Washington, DC.

Judges in those cases will inevitably refer to the Berkeley decision and last week’s ruling by the Southern District of New York, said Ladin—and he hopes they’ll give more weight to the latter. “Berkeley is not a well-reasoned decision, and this judge saw right through it, and I think many other judges will see through it too.”