Here’s a rundown on the winners and losers in the legislation muscled through Congress.

The giant policy bill muscled through Congress by Republicans is poised to remake American energy by slashing tax breaks for wind and solar power and electric cars while maintaining some federal support for sources like nuclear reactors and geothermal plants.

The legislation, which carries President Trump’s domestic policy agenda, provides a boost to fossil fuels and dismantles many of the biggest actions the federal government has ever taken to fight climate change, even as scientists warn that rising temperatures are creating acute dangers from extreme heat, deadly wildfires, crop failures and floods.

Yet there is still uncertainty about how changes from the bill will play out.

Solar farms could still get built even without federal subsidies, though they could be more expensive and more likely to use components made in China than in the United States. Other industries that get favorable treatment, like technology that captures carbon dioxide, could nevertheless struggle.

Here’s a rundown of the energy winners and losers in the bill, which was finalized by the House on Thursday and awaits Mr. Trump’s signature.

A solar farm near the Sherburne County Generating Station in Becker, Minn., last July.Tim Gruber for The New York Times

The bill would quickly phase out tax credits for wind and solar power, two of the fastest growing sources of electricity in the United States. Both industries could shrink but are unlikely to vanish, experts said.

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