Thanks to a 30% federal tax credit, that works out as much the same as a combined-cycle gas-turbine plant but without the noise and fumes.

ECONOMIST: Tech.view

Combined-cycle gas turbines, which use hot exhaust gases from one turbine to generate steam to turn a second one, can transform 6, 800 Btu of gas into a kilowatt-hour of electricity, enough to light one lightbulb for ten hours.

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