Which department ensures both conservation of resources and energy efficiency?

The Department of Energy is tasked with the promotion of energy efficiency and the conservation of energy resources. Its primary focus is to facilitate the United States' energy policy, ensuring the nation's energy supply is both reliable and sustainable. The Department manages programs that develop energy conservation technologies and oversees initiatives that encourage the use of renewable energy sources, ultimately aiming to reduce reliance on fossil fuels and enhance energy security.

This department also plays a significant role in research and innovation related to energy technologies, which supports both conservation efforts and the advancement of energy efficiency across various sectors. By doing so, it contributes to environmental protection while fostering economic growth and job creation in the energy sector.

In contrast, the other departments listed have distinct focus areas that do not primarily involve energy efficiency or resource conservation. The Department of Education, for instance, concentrates on educational policies and services, the Department of the Interior manages the nation’s natural resources and cultural heritage, and the Department of State focuses on foreign affairs and international relations. Thus, these departments do not directly pertain to the mandate of energy conservation and efficiency that is central to the mission of the Department of Energy.