coal

Jayme Orrack oversees Xcel Energy's new wind farm in Courtenay, N.D. The wind farm started generating electricity late last year with 100 turbines that collectively generate 200 megawatts of electricity. Amy Sisk/Prairie Public Broadcasting hide caption

The Colstrip Generating Station near Colstrip, Mont., is the second-largest coal-fired power plant in the West. Two of its four units are scheduled to close by 2022, if not sooner. Nathan Rott/NPR hide caption

Rob Bottegal, head engineer of the Acosta Deep Mine for Corsa Coal Corp., overlooks the mine in Jennerstown, Pa., on Feb. 28. Dan Speicher/Pittsburgh Tribune-Review via AP hide caption

A work crew for the Pittsburgh company Energy Independent Solutions installs solar panels at a community building in Millvale, Pa. Reid Frazier/The Allegheny Front hide caption

Coal is piled up at the Gallatin Fossil Plant in Gallatin, Tenn. Mark Humphrey/AP hide caption

Kevin Butt, Toyota's regional environmental sustainability director, at a facility that uses methane to generate clean electricity to help run Toyota's auto plant in central Kentucky. Jennifer Ludden/NPR hide caption

NET Power has built carbon capture technology into its power plant outside Houston, which will generate electricity by burning natural gas. The demonstration project should be fully operational later this year, according to NET Power. Courtesy of NET Power hide caption

At Kemper, Mississippi Power has built an entirely new coal plant from the ground up. But the plant, which uses carbon capture technology, has experienced missed deadlines, cost overruns and other problems. Courtesy of Mississippi Power hide caption

The Navajo Generating Station located on the Navajo Indian Reservation, near Page, Ariz. Amber Brown/Courtesy of Salt River Project hide caption

Rick Moore, a dairy farmer in Canton, N.Y., has a solar thermal array to heat water he uses to spray down milking equipment. David Sommerstein/North Country Public Radio hide caption

Across the Ohio River from Powhatan Transportation Center — owned by Murray Energy — is a power plant that services mines in West Virginia. Jessica Cheung/NPR hide caption