Robert Murray of Murray Energy (right) meets with Energy Secretary Rick Perry at the Department of Energy headquarters in Washington in a March 29, 2017, photo obtained by The Associated Press.
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.
Drew Angerer/Getty Images
Former Texas governor Rick Perry had his confirmation hearing Thursday as President-elect Donald Trump's pick for secretary of energy. He said he no longer wants to get rid of the agency.
Aaron P. Bernstein/Getty Images
Donald Trump's transition team circulated a survey asking for names of Department of Energy employees who attended climate change conferences. Legal experts question the new administration's motives.
Manuel Balce Ceneta/AP
A participant visits the Africa pavilion Nov. 9 at a UN climate conference, in Marrakech, Morocco. President-elect Donald Trump's transition team has asked the Department of Energy to provide the names of all employees who attended such conferences.
A waxing crescent moon is seen behind a streetlight with a newly installed LED fixture in 2011 in Las Vegas. The city was replacing 6,600 existing lights with the energy-efficient LEDs. It has since replaced tens of thousands more.
Ethan Miller/Getty Images
Beacon Power President and CEO Barry Brits, at the company's plant in Hazle Township, Pa. He says a loan from the Department of Energy made it possible for his company to develop its flywheel energy storage technology.