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The PowerDish from Infinia Corporation concentrates the sun's rays on a piston-free engine held in the device's center.

The engine generates electricity from the pressure created by heating and cooling gas held within it.

The engine has no touching parts and is hermetically sealed, which the company says results in maintenance-free operation.

Each dish can produce three kilowatts of power, enough for a dozen or so troops.

Last updated August 17 2011: 5:47 PM ET
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Minimizing the armed forces' dependence on oil saves soldiers' lives and is a lifeline like no other for the green energy industry.