Combined Cycle Power Plant EPC — 50 MW to 300 MW
Combined cycle is how you convert gas into the most electricity per unit of fuel at utility scale.
A combined cycle plant adds a steam bottoming cycle to a gas turbine, recovering exhaust heat that would otherwise be lost. The result is 55–60% net efficiency against 35–40% for simple cycle — a difference that dominates project economics over a twenty-year life.
Our role in this range is typically as EPC contractor or as the balance-of-plant and integration partner to a gas turbine OEM. We take responsibility for the HRSG, steam turbine, cooling system, electrical integration, control philosophy and the interfaces that most often cause delay on CCGT projects.
Where this plant type fits
- Utility generation — Base-load and mid-merit capacity for national grids with gas availability.
- Industrial energy centres — Large industrial complexes needing both bulk power and process steam.
- District energy — Combined heat and power for industrial zones and district heating networks.
- Repowering — Converting an existing simple cycle plant into combined cycle to add capacity without new gas.
Quick facts
Typical project duration and full scope detail are set out below. For a specific site, ask us for a preliminary configuration.
Request a quoteTypical technical range
Values below are the range we design within. The final specification follows the fuel analysis and site conditions.
| Parameter | Range / Description |
|---|---|
| Capacity range | 50 – 300 MW |
| Configuration | 1×1 or 2×1 multi-shaft; single-shaft optional |
| Net efficiency | 55 – 60% depending on gas turbine class and cooling |
| HRSG | Horizontal or vertical, supplementary firing optional |
| Steam turbine | Condensing with district heating or process extraction |
| Cooling | Wet cooling tower, air-cooled condenser, or once-through |
| Typical construction period | 22 – 34 months |
What is in and what is out
An explicit boundary is the difference between a quotation and a contract. This is the standard split for a combined cycle power plants project.
- Thermodynamic optimisation and configuration study
- Balance of plant design and equipment supply
- HRSG and steam turbine supply and integration
- Electrical system, switchyard and control integration
- Erection, commissioning and performance testing
- Interface management with gas turbine OEM
- Gas turbine supply where nominated by the owner
- Gas pipeline and fuel supply infrastructure
- Transmission line and utility substation
- Long-term service agreement with the OEM
Frequently asked questions
Answers to the questions we are asked most often on this subject. If yours is not here, ask us directly.
Why choose combined cycle over simple cycle?
Efficiency. Simple cycle gas turbines deliver 35–40% net efficiency; a combined cycle configuration reaches 55–60%. On a 100 MW plant running 6,000 hours a year, that difference is worth several million dollars of fuel annually. The trade-off is higher capital cost and a longer build.
Can an existing simple cycle plant be converted?
Usually yes, provided space exists for the HRSG and steam turbine and the gas turbine exhaust is suitable. Repowering is often the cheapest way to add capacity, and it can be done in phases to limit downtime.
What is the typical lead time?
Gas turbine and HRSG are the long-lead items, typically 12–18 months. Total project duration from contract to commercial operation is usually 22–34 months for a 50–300 MW plant.
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View solution →Tell us what you need to build.
Send us the fuel type, target capacity and site country. We will reply with a preliminary configuration, an indicative budget range and the questions we still need answered.