David Zatezalo, the Assistant Secretary of Labor for Mine Safety and Health, was asked about the advanced black lung epidemic at a congressional hearing in Washington, D.C., on Feb. 6, 2018.
Secretary of Energy Rick Perry testifies during a House Energy and Commerce Committee hearing on Capitol Hill in Washington, D.C., on Oct. 12. Perry's proposed rule to benefit nuclear and coal power plants has been rejected by a federal regulatory commission.
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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
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.
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.
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