A more thorough explanation:

The Department of Energy (DOE) is a part of the United States government that helps the President make decisions about energy policies and programs. The DOE works to make sure that energy is used efficiently, that there are many different sources of energy, and that the environment is protected.

The DOE is led by the Secretary of Energy and is responsible for creating a national energy plan. This plan includes researching and developing new energy technologies, finding ways to use less energy, managing the country's nuclear weapons program, and setting prices for energy.

For example, the DOE might work on developing new types of solar panels that are more efficient at converting sunlight into electricity. They might also create programs to help people use less energy in their homes, like by installing energy-efficient light bulbs or improving insulation. The DOE also manages the country's nuclear weapons program, making sure that these weapons are safe and secure.