This is part of a Heatmap series on the “green freeze” under Trump.

A major chapter in climate giving has ended.

Breakthrough Energy, the climate philanthropy organization founded by Bill Gates, is closing its policy and advocacy office and has laid off much of its staff in Washington, D.C., Heatmap News has learned.

The layoffs will effectively gut an organization central to the effort to enact the package of clean energy tax cuts passed during the Biden administration. They will also silence one of the few environmental nonprofits that supported nuclear energy, direct air capture, and other new zero-carbon energy innovations.

More than three dozen employees across the United States and Europe are affected by the layoffs, including the office’s senior leadership.

The layoffs, first reported by The New York Times, come amid a wider billionaire pullback from donating to climate causes. The president and CEO of the Bezos Earth Fund departed last month, and the fund has yet to name a permanent replacement. Gates had already significantly diminished his climate giving earlier this year, slashing Breakthrough Energy’s grantmaking budget last month.

Gates’s investments in clean energy companies do not seem affected by the cutback. Breakthrough Energy’s venture capital and investment arm, its fellows program, and its efforts to catalyze new green products remain intact.

“Gates and Breakthrough Energy remain committed to advancing the clean energy innovations needed to address climate change,” a Breakthrough Energy spokesperson told me in a statement. “Our work is focused on accelerating the transition to a cleaner, more prosperous world.”

The closure of Breakthrough’s policy arm — and the presumed end of its grant-making operation — will alter the world of climate nonprofits. Breakthrough Energy was unusual among environmental and energy nonprofits for its enthusiastic support of all forms of zero-carbon energy, including nuclear fission, geothermal power, carbon capture and removal, and nuclear fusion. Many other prominent nonprofits — even some that have shifted to principally fighting against climate change, like the Sierra Club — are more traditional and conservation-minded, and actively oppose the expansion of nuclear power.

“The closure of Breakthrough is indicative of a broader trend that often happens when there’s a change in power in Washington, which is a retreat from federal policy and also often a retreat from the center,” Josh Freed, the senior vice president for climate and energy at Third Way, told me. The Third Way energy team was funded in part by grants from Breakthrough Energy.

“Breakthrough played a critical role in elevating and making clean energy innovation policy very mainstream. That’s going to continue — in part because of … the partners who they brought together, who remain committed to working on this,” Freed added.

The unwinding of Breakthrough Energy’s policy and advocacy arm means that the group will not see the coming battle over the Inflation Reduction Act’s clean tax cuts, which some Republican lawmakers hope to repeal later this year as part of President Trump’s broader package of tax cuts. Gates was seen as instrumental to the lobbying effort to pass the IRA, meeting with Senator Joe Manchin of West Virginia and other lawmakers to support the 2022 legislation.

In an exclusive interview with Heatmap News in 2023, Gates warned that re-electing Donald Trump could derail the Inflation Reduction Act’s effectiveness.

“Right now, companies are responding to the IRA incentives. But you know, if you get Trump elected, and he really gets rid of it, there’s a lot of business plans that will [make people] feel foolish,” he said.

Even if Democrats ultimately enact new provisions similar to the IRA after Trump leaves office, Gates said, the damage of repealing the law would be permanent. “People [will] say, ‘Well, you’re asking me to make a 30-year investment. And half the time, I’m stupid.’”

Just over a year and one election later, Gates reportedly had a more than three-hour dinner with Trump at Mar-a-Lago. He later told Emma Tucker, The Wall Street Journal’s editor in chief, that he was “frankly impressed” by the president-elect.