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Home An engineering test unit for a Stirling generator being tested at NASA’s Glenn Research Center in Cleveland, Ohio. (NASA) An engineering test unit for a Stirling generator being tested at NASA's Glenn Research Center in Cleveland, Ohio. (NASA)

An engineering test unit for a Stirling generator being tested at NASA’s Glenn Research Center in Cleveland, Ohio. (NASA)

An engineering test unit for a Stirling generator being tested at NASA's Glenn Research Center in Cleveland, Ohio. (NASA)

An engineering test unit for a Stirling generator being tested at NASA’s Glenn Research Center in Cleveland, Ohio. (NASA)

Thousands of mirrors, called heliostats, direct the sun’s energy onto a receiver, which was built using expertise gained from constructing the space shuttle main engine. The NASA spinoff receiver sits on top of a 550-foot tower. (SolarReserve)