Table 4.13. Fuel-Switching Capacity of Operable Generators: From Natural Gas to Petroleum Liquids,
by Type of Prime Mover, 2012 (Megawatts, Percent)

Prime Mover Type Number of Generators Net Summer Capacity Fuel Switchable Net Summer Capacity Reported to Have No Factors that Limit the Ability to Switch to Petroleum Liquids
Steam Generator 183 26,382 17,932
Combined Cycle 433 45,267 6,370
Internal Combustion 324 1,056 328
Gas Turbine 940 56,900 12,880
All Fuel Switchable Prime Movers 1,880 129,604 37,510

Notes: Petroleum includes 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, petroleum coke (converted to liquid petroleum, see Technical Notes for conversion methodology), waste oil, and beginning in 2011, synthetic gas and propane. Prior to 2011, synthetic gas and propane were included in Other Gases.
In 2011, EIA corrected the NAICS codes of several plants which resulted in a net capacity shift from the electric utility sector to the commercial sector.
Source: U.S. Energy Information Administration, Form EIA-860, 'Annual Electric Generator Report.'