Combined-cycle power plant (CCGT)
A combined-cycle gas turbine (CCGT) plant combines a gas turbine and a steam turbine: exhaust heat from the gas turbine passes through a heat-recovery steam generator (HRSG) to drive a second, steam cycle. This raises overall efficiency well above a simple-cycle plant.
Frequently asked questions
How efficient is a combined-cycle plant?
Modern combined-cycle plants reach about 60-64% efficiency, far above open-cycle gas turbines (~35-40%).
Does every combined-cycle plant have an HRSG?
Yes — the HRSG is the component that recovers the gas turbine's exhaust heat to feed the steam cycle.
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