Table 4.14. Fuel-Switching Capacity of Operable Generators Reporting Natural Gas as the Primary Fuel,
by Year of Initial Commercial Operation, 2017 (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 294 12,279.9 4,648.5
1970-1974 270 14,846.4 4,573.1
1975-1979 100 11,325.2 3,212.2
1980-1984 42 862.1 205.7
1985-1989 91 2,812.7 329.2
1990-1994 201 11,556.4 1,448.4
1995-1999 132 9,527.7 1,940.8
2000-2004 398 38,056.4 6,531.0
2005-2009 119 15,480.1 1,867.5
2010-2014 98 10,883.4 99.2
2015-2017 35 3,680.8 1,702.5
Total 1,780 131,311.1 26,558.1

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."