Table 4.13. Fuel-Switching Capacity of Operable Generators Reporting Natural Gas as the Primary Fuel,
by Type of Prime Mover, 2013 (Megawatts, Percent)

Prime Mover Type 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
Steam Generator 189 29,066 10,287
Combined Cycle 417 44,593 6,741
Internal Combustion 343 1,054 318
Gas Turbine 914 56,214 11,906
All Fuel Switchable Prime Movers 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.'