Table 4.14. Fuel-Switching Capacity of Operable Generators Reporting Natural Gas as the Primary Fuel,
by Year of Initial Commercial Operation, 2019 (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 265 10,584.0 3,258.7
1970-1974 258 14,024.6 4,206.3
1975-1979 95 10,371.5 2,473.4
1980-1984 38 822.8 199.3
1985-1989 84 2,738.5 195.3
1990-1994 193 11,645.8 1,359.8
1995-1999 128 9,070.7 1,656.6
2000-2004 396 37,734.2 6,345.5
2005-2009 118 15,505.8 1,729.6
2010-2014 99 11,409.8 241.2
2015-2019 67 8,892.4 2,684.2
Total 1,741 132,800.1 24,349.9

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."