The source describes combined-cycle turbine configurations as follows:
1x1: One combustion turbine (either single shaft or separate shaft) and one steam turbine.
2x1: Two combustion turbines and one steam turbine.
3x1: Three combustion turbines and one steam turbine.
Citation formats
Combined-cycle natural gas turbine capacity in the U.S. 2020, by configuration
In the United States, the most common configuration for combined-cycle natural gas turbines includes two combustion turbines and one steam turbine. Turbine systems of this configuration had a combined capacity of 154 gigawatts in 2020. Combined-cycle natural gas turbine systems include both steam turbines and combustion turbines. In these systems, exhaust heat from one or more combustion turbines is sent to a recovery steam turbine which then generates additional electricity.
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EIA. (April 25, 2022). Capacity of combined-cycle natural gas turbines in the United States in 2020, by turbine configuration (in gigawatts) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 27, 2026, from /statistics/1308969/us-natural-gas-turbine-capacity-by-configuration/
EIA. "Capacity of combined-cycle natural gas turbines in the United States in 2020, by turbine configuration (in gigawatts)." Chart. April 25, 2022. ÌÇÐÄÆƽâ°æ. Accessed July 27, 2026. /statistics/1308969/us-natural-gas-turbine-capacity-by-configuration/
EIA. (2022). Capacity of combined-cycle natural gas turbines in the United States in 2020, by turbine configuration (in gigawatts). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 27, 2026. /statistics/1308969/us-natural-gas-turbine-capacity-by-configuration/
EIA. "Capacity of Combined-cycle Natural Gas Turbines in The United States in 2020, by Turbine Configuration (in Gigawatts)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 25 Apr 2022, /statistics/1308969/us-natural-gas-turbine-capacity-by-configuration/
EIA, Capacity of combined-cycle natural gas turbines in the United States in 2020, by turbine configuration (in gigawatts) ÌÇÐÄÆƽâ°æ, /statistics/1308969/us-natural-gas-turbine-capacity-by-configuration/ (last visited July 27, 2026)
Capacity of combined-cycle natural gas turbines in the United States in 2020, by turbine configuration (in gigawatts) [Graph], EIA, April 25, 2022. [Online]. Available: /statistics/1308969/us-natural-gas-turbine-capacity-by-configuration/
