CCGT
Thermal.
Combined-Cycle Gas Turbine (CCGT) technology represents the pinnacle of thermal power efficiency. By capturing and reusing waste heat from a gas turbine in a secondary steam cycle, CCGT plants achieve net electrical efficiencies of up to 64% — roughly double that of older open-cycle plants — while operating with the fast-start flexibility that modern grids demand.
The Combined
Cycle Process.
Gas Turbine Combustion
Natural gas (or hydrogen blend) combusts in a gas turbine, spinning the primary generator. Exhaust temperatures reach 600°C.
Heat Recovery Steam Generator (HRSG)
The hot exhaust gases pass through the HRSG, producing high-pressure steam — capturing energy that a simple-cycle plant would waste to atmosphere.
Steam Turbine Generation
The recovered steam drives a secondary steam turbine, typically adding 30–40% of primary output. This two-stage process is what achieves the 60–64% overall efficiency.
Combined Output to Grid
Both generators synchronise to grid frequency. The plant operators can ramp output from minimum stable generation (MSG) to full-load in under 30 minutes.
Flexible.
Dispatchable. Efficient.
Peaker Plants
Fast-start CCGT plants filling the gap between baseload and peak demand. Critical for grid stability as renewable penetration grows.
Baseload Capacity
Highly efficient combined-cycle baseload plants operating at high capacity factors in markets with low gas prices and carbon pricing.
Hydrogen-Ready Design
Our CCGT designs incorporate hydrogen co-firing capability, positioning assets for the energy transition to green hydrogen.
Grid Balancing
Fast-ramping CCGT plants provide frequency response and spinning reserve — revenue streams increasingly valued by grid operators.
Why CCGT?
CCGT plants bridge the gap between the need for reliable dispatchable power and a net-zero future. Their inherent flexibility and declining carbon intensity through hydrogen co-firing make them the thermal technology of choice for the energy transition.
Developing a thermal generation project?
Talk to our CCGT engineering and development team.