<P> Another application of hydroelectricity is Pumped - storage hydroelectricity which does not create a net gain in power but enables peak demand balancing . Water is pumped from a lower elevation source into a higher one and only released through generators when electric demand is high . In 2009 the United States had 21.5 GW of pumped storage generating capacity, accounting for 2.5% of baseload generating capacity . Bath County Pumped Storage Station is the largest such facility in the world . Other stations of this type include Raccoon Mountain Pumped - Storage Plant, Bear Swamp Hydroelectric Power Station and Ludington Pumped Storage Power Plant on Lake Michigan and previously the largest in the world . </P> <P> No significant tidal power plants exist in the United States . A project was proposed and run by the Snohomish County PUD in Washington but was ended when trouble was encountered obtaining enough funding . </P> <Table> <Tr> <Th> </Th> <Th> Name </Th> <Th> Year of completion </Th> <Th> Total Capacity (MW) </Th> </Tr> <Tr> <Td> </Td> <Td> Grand Coulee </Td> <Td> 1942 / 1980 </Td> <Td> 6,809 </Td> </Tr> <Tr> <Td> </Td> <Td> Bath County PSP </Td> <Td> 1985 </Td> <Td> 3,003 </Td> </Tr> <Tr> <Td> </Td> <Td> Chief Joseph Dam </Td> <Td> 1958 / 73 / 79 </Td> <Td> 2,620 </Td> </Tr> <Tr> <Td> </Td> <Td> Robert Moses Niagara Power Plant </Td> <Td> 1961 </Td> <Td> 2,515 </Td> </Tr> <Tr> <Td> 5 </Td> <Td> John Day Dam </Td> <Td> 1949 </Td> <Td> 2,160 </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Hoover Dam </Td> <Td> 1936 / 1961 </Td> <Td> 2,080 </Td> </Tr> <Tr> <Td> 7 </Td> <Td> The Dalles Dam </Td> <Td> 1957 </Td> <Td> 2,038 </Td> </Tr> </Table> <Tr> <Th> </Th> <Th> Name </Th> <Th> Year of completion </Th> <Th> Total Capacity (MW) </Th> </Tr>

Where is hydroelectric energy used in the usa
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