Energy sources are materials, processes, or systems that produce usable power to fuel human activities. They range from traditional hydrocarbons like coal, oil, and natural gas to alternatives such as wind and solar. Each source has unique characteristics regarding availability, efficiency, and economic viability.
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There’s heat beneath your feet—a vast, largely untapped renewable energy resource. Geothermal energy has a unique role to play in providing clean energy across the entire United States.September 19, 2025 -
Providing clean, reliable energy to meet the nation’s energy, environmental, and economic needs.March 31, 2026 -
The Energy Department works to ensure domestic and global oil supplies are environmentally sustainable and maintains emergency petroleum stockpiles.March 31, 2026 -
Solar energy is the fastest growing and most affordable source of new electricity in America. As the cost of solar energy systems dropped significantly, more Americans and businesses are taking advantage of clean energy.December 17, 2025