Residents of Waubra, a town near Victoria's biggest wind generator, recently complained that low-frequency noise was causing headaches and earaches.

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The on-board motor is a tiny, 3-cylinder generator that supplies electricity when the battery runs low.

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IMechE says this process is only 25% efficient but it is massively improved by co-siting the cryo-generator next to an industrial plant or power station producing low-grade heat that is currently vented and being released into the atmosphere.

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But the vehicle has a small gasoline-powered generator on board that can charge the battery on the fly when it gets low.

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