随后，蒸汽动力登上了历史舞台，让整个水力发电的前景一度遭到了怀疑。

Then steam power entered the scene, putting the whole future of waterpower in doubt.

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但是，沿河居住的当地人表示，他们从未被征询关于水力发电的计画。

But local people along the river say they have not been consulted about the hydroelectric schemes.

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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。

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.

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