The U.S. Department of Energy (DOE) is a federal agency responsible for shaping energy policy and ensuring the nation's energy security. Established in 1977, it oversees the production and regulation of energy resources, including nuclear energy, renewable energy, and fossil fuels. The DOE also conducts scientific research and development to promote energy efficiency and innovation. In addition to energy management, the DOE plays a crucial role in environmental protection and addressing climate change. It supports initiatives to reduce greenhouse gas emissions and promotes the use of clean energy technologies. The department also manages the country's nuclear weapons stockpile and ensures the safety of nuclear facilities.