Source: U.S. Energy Information Administration, Form EIA-860 Annual Electric Generator Report, and Form EIA-860M (see Table ES3 in the March 2011 Electric Power Monthly)
Note: Data for 2010 are preliminary. Generators with online dates earlier than 1930 are predominantly hydroelectric. Data include non-retired plants existing as of year-end 2010. This chart shows the most recent (summer) capacity data for each generator. However, this number may change over time, if a generator undergoes an uprate or derate.
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Source: U.S. Energy Information Administration, Form EIA-860 Annual Electric Generator Report and Nuclear Regulatory Commission data
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http://www.eia.gov/todayinenergy/detail.cfm?id=2030