Coal typically produces almost twice as much carbon dioxide per kilowatt-hour as natural gas.

通常来讲，煤生产每千瓦时产出的二氧化碳约为天然气的两倍。

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U.S. residential customers pay an average of 11 cents per kilowatt-hour (kWh) for power from a mix of coal, natural gas, nuclear and hydroelectric sources, but renewables are far pricier.

在美国，煤，天然气，核能以及水力发电的平均电价是一度电11美分。

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Coal, with its emissions of sulphur, mercury and soot, will continue to kill far more people per kilowatt hour than nuclear does.

而排放硫、汞和煤灰的煤炭，其每千瓦时产能所造成的死亡人数仍将远远高于核能。

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Given those challenges and costs, it is therefore necessary to drive the cost per kilowatt-hour down.

FORBES: Connect

The wholesale energy market is volatile, and prices for electricity per kilowatt-hour can fluctuate daily.

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Laviziano says a commercial solar installation can produce power for 25 cents per kilowatt-hour.

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