An internal combustion generator converts the gas back into electricity to provide power for the home.

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Rob Peterson and Britta Gross of GM, both integral to the Volt program, dare me to guess when the car switches from battery-only to using the gas engine as a generator, and I totally miss it.

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The Volt can go 40 miles on a single charge (about a average day's miles for the typical American), and it also has a gas-powered generator that gives it the ability to drive 300 more miles, Chevrolet says.

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The way utilities now meet demand spikes is to attach an extra natural-gas-fired generator or two to the grid and let it sit idle for most of the year.

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Race Point Light on Cape Cod, Massachusetts doesn't have electricity-just gas lanterns-and the generator runs for barely two hours a day.

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Only a gas-powered generator on the roof of the aquarium's hospital continued working.

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And just before the gas heads to the still it is passed through a turbo-generator which producers electricity for the distillery.

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