Electricity -- the flow of electrical power -- is a secondary energy source generated by the conversion of primary sources of energy like fossil, nuclear, wind or solar.
Keeping the power flowing to American homes and businesses is a critical necessity for everyday life and economic vitality. The Energy Department works to keep the grid secure from cyber and physical attacks; partners with states and other stakeholders to plan more resilient infrastructure that can better withstand extreme weather events; and supports efforts to increase grid efficiency and energy storage as more renewable energy sources come online.
The Energy Department is investing in strategic partnerships to accelerate the Smart Grid -- a two-way, intuitive system that will result in more e...
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The Energy Department is developing new technologies that will store renewable energy for use when the wind isn't blowing and the sun isn't shining.
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From incandescent bulbs to fluorescents to LEDs, we're exploring the long history of the light bulb.
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Our new infographic shows how electricity is generated, transmitted and distributed for use in our homes.
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Nikola Tesla and Thomas Edison played key roles in the War of the Currents. Learn more about AC and DC power -- and how they affect our electricity use today.
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Learn about synchrophasors and how they are helping grid operators keep power flowing reliably to American homes and businesses.
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