The Department of Defense plans to spend $20 million to increase the number of electric cars in use at six armed forces installations by up to a total 500 vehicles. That electric investment may end up saving taxpayers’ money in the long run.

When the DOD’s fleet of electric vehicles are off duty, they will continue to serve America by feeding energy into the electric grid. By pumping electricity into the grid during peak hours, the electric cars will help offset their cost.

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“It’s about being able to deliver electricity on demand. It will be a sizable amount of power when all of the vehicles are aggregated together,” said Camron Gorguinpour, special assistant to the assistant secretary of the Air Force for installations, environment and logistics, in a press release.

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“What we have identified is a path forward that will allow us to bring electric vehicles into our fleet that are less costly than conventional vehicles,” Gorguinpour said.

IMAGE: U.S. Army Spc. Dean Kalogris charges the installation’s command sergeant major’s electric car on Fort Bliss, Texas, April 14, 2010. (U.S. Army, Wikimedia Commons)