As of January 1, 1999, the existing generating capacity of the United States totaled 686,692 megawatts (DOE, 1999). In 1996, the U.S. produced 3.629 trillion kWh per year, split between fossil fuel (65.1%), nuclear (18.6%), hydroelectric (9.6%), and other (6.7%) sources (CIA, 2000). During this year, the U.S. imported 46.543 billion kWh, exported 9.02 billion kWh, and consumed a total of 3.666 trillion kWh. The annual per capita energy use has risen from about 4,200 kWh in 1960 to about 11,400 kWh in 1995 (Brown, 1999).
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