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Hydropower Overview

In 2005, net generation of hydropower was 270 billion kilowatt hours. According to the Energy Information Administration, this generation accounted for approximately 6.5 percent of the nation's net generation last year. As illustrated in the graph below, hydropower represents a smaller slice of the national energy mix than it does in the Northwest. Nationally, coal still generates approximately 50 percent of the nation's electricity.

While hydropower may represent a relatively small percentage of generation on a national level, the generation mix at the regional level is very different. In the states represented by the Northwest Hydroelectric Association (California, Washington, Oregon, Idaho and Montana), hydropower provided 40% of the electric generation mix in 2004.

Total 386,800,000 MWhrs (approx)

Hydro Generation by Northwest States

Reliance on hydropower for electric generation is even more dramatic if viewed by individual state.  Washington, Oregon and Idaho all rely on hydropower as a source for the majority of their electric generation. 

Note: the following generation mix represents the electric generation (not consumption) by state.  "All other renewables" includes: wood, black liquor, other wood waste, municipal solid waste, landfill gas, sludge waste, tires, agriculture byproducts other biomass, geothermal, solar thermal, photovoltaic energy and wind.

Total: 102,165,052 MWhrs                                                                                         Total 51,381,278 MWhrs

Total: 194,780,355 MWhrs                                                                                         Total 10,863,039 MWhrs

Total 26,788,768 MWhrs                                                                                           

For a detailed breakdown of state electricity profiles and source data for these graphs, see the Energy Information Administration's State Electricity Profiles of 2004, published in May, 2006. DOE/EIA-0629(2004).

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