Most of the 1.5 million electricity consumers served by the Tri-State Generation and Transmission Association probably don’t think about it. But when they wake up and flip on their light switches each morning, they can thank in significant part Tri-State’s Craig Station power plant in Moffat County, the second largest in Colorado. And that power plant can operate only thanks to hundreds of local workers digging in, not just figuratively at the plant itself, but literally at the two area surface mines — Colowyo and Trapper — that provide the plant’s coal. ... With 220 people working at Colowyo, some...