Coal, the cheapest fuel, currently produces America's baseload power: coal-fired plants run constantly to meet basic demand, with natural gas switched on when demand is higher.

作为价格最为低廉的燃料，煤是产出美国基载电力的主力。煤燃料发电厂不断满足基本需求，当需求更大时将启用天然气燃料。

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And it is the cheapest source of fuel for electric power production.

而且煤炭是最便宜的电力生产燃料来源。

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Many countries continue to use coal for generating power as it is the cheapest and most readily available fuel in the world.

许多国家继续使用煤发电，因为煤最便宜，供应也最稳定。

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Saudi Arabia has the cheapest fuel in the Gulf and dirt-cheap electricity, too.

ECONOMIST: Gulf states not only pump oil; they burn it, too

The cheapest fuel was also the dirtiest, the most devastating to the environment.

CNN: Energy debate may soon turn on 'cleaner' coal

Coal, the cheapest fuel, currently produces America's baseload power: coal-fired plants run constantly to meet basic demand, with natural gas switched on when demand is higher.

ECONOMIST: What bigger estimates of America��s reserves could mean