Table 4.14. Fuel-Switching Capacity of Operable Generators Reporting Natural Gas as the Primary Fuel,
by Year of Initial Commercial Operation, 2013 (Megawatts, Percent)

Year of Initial Commercial Operation Number of Generators
Net Summer Capacity of Natural Gas-Fired Generators Reporting the Ability to Switch to Petroleum Liquids
Fuel Switchable Net Summer Capacity Reported to Have No Factors that Limit the Ability to Switch to Petroleum Liquids
Pre-1970 316 12,102 5,537
1970-1974 349 18,161 6,959
1975-1979 101 11,466 3,525
1980-1984 47 970 336
1985-1989 93 2,865 391
1990-1994 220 12,110 1,615
1995-1999 132 9,498 1,748
2000-2004 391 38,528 7,892
2005-2009 128 16,171 1,160
2010-2013 86 9,057 90
Total 1,863 130,927 29,252

Notes: Petroleum liquids include 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, waste oil, and propane.
Source: U.S. Energy Information Administration, Form EIA-860, "Annual Electric Generator Report."