Combined-cycle natural gas-fired power plants normally compete directly with coal-fired power plants for the largest share of electricity generation. Net summer capacity (or the maximum output that generating equipment can supply to system load at the time of summer peak demand) has been increasing for natural gas and declining for coal. Natural gas-fired generation capacity at combined-cycle power plants has increased from 218 gigawatts (GW) in 2012 to 278 GW in 2021. By comparison, the capacity of coal-fired power plants has declined from 305 GW in 2012 to 211 GW in 2021.
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