Green River Star -

CASPER — The biggest coal-fired power plant in the country gets all of its coal from Wyoming. A second of its four units is now slated for retirement, halving total capacity before the end of the decade.

Three Wyoming mines — Buckskin, Caballo and Eagle Butte — supply most of the millions of short tons of coal burned annually by Georgia’s 3,520-megawatt Robert W. Scherer Power Plant.

Last year, roughly 10% of the mines’ combined coal production went to Scherer, according to the Energy Information Administration.

Unit 3 is expected to shutter by 2025, E&E News reported Friday. I...