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Hydroelectricity
Beginning of essay
Waterpower, power derived from the fall of water from a higher to a lower level, and extracted by means of waterwheels or hydraulic turbines (see Turbine). Waterpower is a natural resource, available wherever a sufficient volume of steady water flow exists. The development of waterpower today requi ....
Middle of essay
....n be assured. In contrast to storage-type plants, which depend on the impounding of large amounts of water, a few examples exist where both the water drop and the steady flow rate are high enough to permit so-called run-of-the-river installations; one such is the joint U.S.-Canadian Niagara Falls power project.
Although hydroelectric-power generation in the U.S. has increased from about 16 billion kWh in 1920 to about 280 billion kWh annually in the 1990, the percentage of electricity generated .... |
| Number of words: 506 |
Approximate pages: 2 |
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