Table 4.14. Fuel-Switching Capacity of Operable Generators: From Natural Gas to Petroleum Liquids,
by Year of Initial Commercial Operation, 2012 (Megawatts, Percent)

Year of Initial Commercial Operation Number of Generators Net Summer Capacity Fuel Switchable Net Summer Capacity Reported to Have No Factors that Limit the Ability to Switch to Petroleum Liquids
Pre-1970 318 11,735 7,535
1970-1974 376 18,210 11,033
1975-1979 105 11,031 7,283
1980-1984 46 945 211
1985-1989 107 3,155 413
1990-1994 208 11,738 1,453
1995-1999 134 9,680 2,099
2000-2004 392 39,841 5,098
2005-2009 116 14,791 2,066
2010-2012 78 8,479 320
Total 1,880 129,604 37,510

Notes: Petroleum includes distillate fuel oil (all diesel and No. 1, No. 2, and No. 4 fuel oils), residual fuel oil (No. 5 and No. 6 fuel oils and bunker C fuel oil), jet fuel, kerosene, petroleum coke (converted to liquid petroleum, see Technical Notes for conversion methodology), waste oil, and beginning in 2011, synthetic gas and propane. Prior to 2011, synthetic gas and propane were included in Other Gases.
In 2011, EIA corrected the NAICS codes of several plants which resulted in a net capacity shift from the electric utility sector to the commercial sector.
Source: U.S. Energy Information Administration, Form EIA-860, "Annual Electric Generator Report."