The United States Department of Energy (DOE ) is a Cabinet -level department of the United States government responsible for energy policy and nuclear safety . Its responsibilities include the nation's nuclear weapons program, nuclear reactor production for the United States Navy , energy conservation , energy-related research, radioactive waste disposal, and domestic energy production . DOE also sponsors more basic and applied scientific research than any other US federal agency; most of this is funded through its system of United States Department of Energy National Laboratories .
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