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Energy Sources

Primary energy sources take many forms, including nuclear energy, fossil energy -- like oil, coal and natural gas -- and renewable sources like wind, solar, geothermal and hydropower. These primary sources are converted to electricity, a secondary energy source, which flows through power lines and other transmission infrastructure to your home and business.

Learn more about America’s energy sources: fossil, nuclear, renewables and electricity.

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How 3D Printers Work
3D Printing in 30 Seconds

As part of our How Energy Works series, learn everything you need to know about 3D printers, from how they work to the different types of systems to the future of the technology.

Photo Gallery: 3D Printing Brings Classic Shelby Cobra to Life

All-electric 50th-anniversary Shelby Cobra car was created using large-scale 3D-printer at Oak Ridge National Laboratory.

Video: SuperTruck Barreling Down the Road of Sustainability

Latest Energy 101 video shows how new technologies are making heavy duty trucks more fuel efficient and less expensive to operate.

Top 4 Energy Department Inventions Saving You Energy & Money at Home

Learn how the Energy Department is helping lay the foundation for more efficient homes by developing energy-saving technologies.

You Asked, We’re Answering Your Fuel Cell Questions

We're answering your questions about fuel cells.