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Power generation that uses gas-turbine heat to produce steam for additional electricity generation.
Fuel burns in the gas turbine, turning machinery connected to a generator. A heat-recovery steam generator captures exhaust energy, producing steam for another electricity-generating turbine. Output and efficiency depend on design, operating conditions and maintenance. The system still needs fuel and supporting infrastructure; it is not renewable simply because it recovers waste heat. Starting or operating at low output can differ from steady full-load performance.
Imagine a simplified plant receiving 100 units of fuel energy. Its gas-turbine stage produces 35 units of electricity, and recovered exhaust heat supports another 20 units from the steam stage. Total electricity is 55 units, giving 55% efficiency on that stated energy basis. The remaining energy is lost or not converted into electricity. These illustrative numbers are not specifications for an actual plant.