In a year, the average home USES about 20, 000 units (kilowatt hours) of energy via gas use.

在一年中，平均每个家庭耗费的燃气大约为2万个字(千瓦小时)。

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Those solar panels will produce 6.5-million kilowatt-hours of electricity per year.

这些太阳能电池每年可以发电650万千瓦时，这些电力可以供应超过九千个美国家庭，足以满足校园用电的需求。

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Every year, Americans produce 12 trillion gallons of wet sewage and burn 21 billion kilowatt-hours of electricity to clean it to drinking-water standards.

每年，美国都会产生12万亿加仑的污水，并耗费21万亿千瓦时的电力将这些污水净化到饮用水的标准。

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It produces more juice (5 billion kilowatt-hours per year) than a typical coal-fired plant.

FORBES: American Pyramids

Donald Markeley, Southeast's chief operating officer, plans to sell 165 million kilowatt-hours a year of electric output at maybe 8 cents apiece.

FORBES: International

Thanks to its heavily insulated roof and double-glazed, low-emissivity glass throughout, Mayhem Manor's electricity consumption is a modest 8, 300 kilowatt-hours a year.

ECONOMIST: The much-talked-of smart grid prepares to enter the home