For 2010, the difference between preliminary and final net generation data from all sources was 0.1 %. (eia.gov)
Electric utilities provided net generation of 290,478,000,000 kWh and non-utility generators provided 61,752,000,000 kWh. (darrylmueller.com)
Despite seasonally low loads, natural gas - fired generation grew markedly and accounted for 30 % of overall net generation by March 2012 (see chart above). (eia.gov)