Power PlantsGas Turbine Combined Cycle (GTCC) Power Plants
World-class Power Generation Efficiency
At Least 63% (LHV)
Wide Output Range
40 to 720 MW Class
Combined Cycle Power Plants
On Grid Facility for Verification Testing
CO2 Emissions Compared with Those of Conventional Coal-fired Thermal Power Generation
About 50% Lower
High efficiency energy through combined cycle power generation
Gas turbine combined cycle (GTCC) power plants utilize fossil fuels to deliver the cleanest and highest efficiency power generation.
Plants employing state-of-the-art J-series gas turbines of Mitsubishi Hitachi Power Systems (MHPS) have a 20% higher power generation efficiency than conventional coal-fired thermal power generation systems and achieve the world' s highest level of efficiency of at least 63%. In addition, this enables CO2 emissions to be reduced by about 50%.
What is GTCC?
In the power generation method characterized by the standalone operation of a gas turbine, known as the simple cycle or open cycle, the gas turbine releases exhaust gas at high temperatures of around 600°C into the atmosphere.
Combined cycle power generation is intended to improve the general thermal efficiency of the plant by recovering this high temperature exhaust gas. Many combined cycle power generation plants for business adopt a waste heat recovery cycle, in which exhaust gas from the gas turbine is led to the waste heat recovery boiler to generate steam using the recovered heat to drive the steam turbine.
Advantages and Features that Make the GTCC the Mainstream for New Thermal Power Generation Facilities
- High level of thermal efficiency
- In comparison with thermal efficiency of about 40% in steam power generation, combined cycle power generation features a thermal efficiency of at least 60% (with both figures on the lower heating value basis).
- Carbon dioxide (CO2) is released in smaller quantities into the atmosphere.
- Nitrogen oxides (NOx) and sulfur oxides (SOx) are released in smaller quantities into the atmosphere.
- High temperature wastewater is discharged in smaller quantities into the sea.
Our GTCC Business
In 1984, we delivered a combined cycle power plant to the Higashi-Niigata Thermal Power Station of Tohoku Electric Power Co., Inc. to achieve a revolutionary thermal efficiency over 44%, then the world' s highest. It attained far greater energy efficiency than conventional thermal power plants.
In 1999, a combined cycle power plant incorporating the G-series gas turbine was constructed and delivered for the No. 4 Series for the same power station. The thermal efficiency of the plant exceeded 50%. In 2016, the combined cycle power plant with the J-series gas turbine reached a cumulative total operation time of 250,000 hours as a commercial system. A cumulative total operation time of more than 250,000 hours is a yardstick for the reliability of gas turbines in the power generation industry. It is the world' s longest among the gas turbines in its output range.
As Japan' s one and only manufacturer engaging in design, manufacturing, civil engineering, installation, commissioning and after-sales services with its own technologies, we proudly hold a great track record.
For overseas markets, we have exported at least 25 combined cycle power plants to about 20 countries mainly in Southeast Asia, the Middle East, Europe, North America and South America.
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