Money is the mother’s milk of politics, but the outcome of elections also determines where it flows — and last month’s was especially crucial for the energy industry.

Clean investment — including renewable energy as well as the manufacturing of electric vehicles, batteries and solar panels — has boomed since the passage of the 2022 Inflation Reduction Act, championed by President Biden. In the third quarter of 2024, it reached a record $71 billion, according to a tracker maintained by the Rhodium Group, an energy-focused research firm, and M.I.T.

The big question looming now on Wall Street: Will President-elect Donald J. Trump, who called Mr. Biden’s policies the “green new scam” during the campaign, pull back enough of those subsidies and regulations to meaningfully change the economics of investing in decarbonization?

Market reactions right after the election seemed clear. Clean energy stocks dropped sharply, while shares of oil companies bounced, indicating a divergent view of how the two sectors will fare in the coming years.

Near the top of Mr. Trump’s agenda next year is extending his 2017 tax cuts. He will most likely need to reduce spending elsewhere to do that. Clean energy tax credits — worth about $350 billion over just the next three years, according to the Congressional Joint Committee on Taxation — would be a tempting target. The more those subsidies are pared, the more projects would no longer make financial sense.