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Dish prototype
Infinia, which designs and manufactures motors, is developing a solar-electric dish that will generate electricity. The system will include a "free-piston" sterling engine that uses changes in air pressure to drive a motor, generating electricity. The dish concentrates sunlight on the engine suspended in front of it. A p[rototype system is shown here. Sterling engines were invented in the 19th century as an alternative to steam engines.

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