The Pacific Northwest generates more hydroelectric power than any other type; 63% of its energy comes from hydroelectric dams. For more specific numbers by state, look at this table: http://www.eia.doe.gov/cneaf/solar.renewables/page/hydroelec/hydroelec.html
The other answer references electricity, not total energy. If the original question refers to total energy, then petroleum will be the largest source as it is the source for virtually all transportation fuel as well as home heating oil.
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