Table 4.14. Fuel-Switching Capacity of Operable Generators Reporting Natural Gas as the Primary Fuel,
by Year of Initial Commercial Operation, 2014 (Megawatts, Percent)

Year of Initial Commercial Operation Number of Natural Gas-Fired Generators Reporting the Ability to Switch to Petroleum Liquids
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 289 12,454.6 5,169.1
1970-1974 338 17,648.0 6,483.6
1975-1979 93 10,147.5 2,252.6
1980-1984 48 1,019.5 216.3
1985-1989 90 2,781.9 391.0
1990-1994 219 12,124.9 1,584.9
1995-1999 131 9,611.6 1,843.5
2000-2004 390 37,954.5 8,045.5
2005-2009 128 16,065.4 1,155.4
2010-2014 93 10,569.8 89.8
Total 1,819 130,377.7 27,231.7

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."