In just its first three years, the Inflation Reduction Act had historic impacts on the U.S. energy mix, spurring 115 gigawatts of new, clean generation — enough to power more than 20 million American homes.The law was also living up to its promise to be the largest climate action in U.S. history, with projections that it would lead to up to 500 million metric tons of greenhouse gas reductions from the power sector alone a year by 2035. Then Trum…