Since its inception in 1991, the program has saved 100 terawatt-hours of electricity, or 2.5 percent of total U. S. electricity consumption in a year.

自1991年成立以来，该计划已在一年节省100兆瓦的电力，或2.5美国总耗电量的百分之小时。

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A study released last week by the Federal Network Agency shows that energy generated with brown coal will remain virtually stabile, at 148 terawatt-hours, until 2022.

由联邦网络机构上周公布的一项研究表明，到2022年之前褐煤产生的能量将几乎保持稳定在148太瓦。时。

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The EU Commission projects the ban on the energy-inefficient bulbs will save about 40 terawatt hours of energy in the EU per year — enough to meet the energy demands of a small country.

据欧盟委员会预计，禁用高能耗的白炽灯泡每年将为欧盟节省约40太瓦时的电能，这足以满足一个小国的用电需求。

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This could store a lot of heat: as much as 4, 000 terawatt-hours, according to Dr Henkel.

ECONOMIST: Geothermal energy

In 2009, Japan generated 956.5 terawatt hours (TWh) of energy, 30% of it from natural gas and 29% of it from nuclear sources.

FORBES: Japan Will Struggle To Meet Electricity Demand

About 10 percent of the power is lost with each conversion step, and that can add up to terawatt-hours of power that just goes to waste.

FORBES: Google-backed Transphorm Raises $25M For Power Conversion Tech