Definition
A Combined Cycle Gas Turbine (CCGT) plant captures the waste heat from a gas turbine's exhaust to raise steam for a second, steam-driven turbine. By harvesting energy twice from the same fuel, modern CCGT installations reach thermal efficiencies near 60%, making them the most fuel-efficient form of natural-gas generation. For a miner evaluating on-site power, that efficiency translates directly into a lower cost per kilowatt-hour and a smaller fuel bill per terahash.
Why CCGT matters for mining
Because a CCGT extracts more electricity from each unit of gas, its heat rate is among the lowest of any thermal plant, often around 6,000-6,960 Btu/kWh for recent builds. The trade-off is responsiveness: the steam bottoming cycle takes time to warm up, so a CCGT is slow to start and best run as a steady baseload source rather than a fast-cycling peaker.
Baseload power for a hashcenter
For operators co-locating ASICs with stranded or discounted gas, a CCGT's high efficiency and continuous output suit a 24/7 hashing load well, since miners themselves run at a near-constant draw. The capital cost and complexity are higher than a simple turbine or engine, but over thousands of run-hours the fuel savings usually dominate the economics. CCGTs are frequently contrasted with open-cycle (peaker) turbines, which sacrifice efficiency for the ability to start and stop quickly.
Understanding where CCGT sits on the efficiency-versus-flexibility curve helps a sovereign miner decide whether to chase the lowest possible energy cost or the fastest demand response. Compare it with a reciprocating engine genset and the prime versus standby rating of any unit before committing capital.
In Simple Terms
A Combined Cycle Gas Turbine (CCGT) plant captures the waste heat from a gas turbine’s exhaust to raise steam for a second, steam-driven turbine. By…