In Some States, Emissions Cuts Defy Skeptics

The cries of protest have been fierce, warning that President Obama’s plan to cut greenhouse gases from power plants will bring soaring electricity bills and even plunge the nation into blackouts. By the time the administration is finished, one prominent critic said, “millions of Americans will be freezing in the dark.”

Yet cuts on the scale Mr. Obama is calling for — a 30 percent reduction in emissions from the nation’s electricity industry by 2030 — have already been acco