Combined-cycle Power Plants


Combined-cycle technology uses both a gas turbine and a steam turbine to generate electricity burning natural gas, a fuel with a lower environmental impact than other fossil fuels. The exhaust heat from the gas turbine is used to generate steam, generating electricity twice and minimizing waste.

  • High thermal efficiency
    Steam turbine operating alone 43% Gas turbine operating alone 40%
    →Combined cycle 60% or higher
    ※A2% improvement in generating efficiency equates to an annual reduction of about 35,000 tons of CO2.
  • Environmentally friendly
    Low carbon dioxide (CO2) emissions released into the air
    Low nitrogen oxide (NOX) and sulfur oxide (SO2) emissions released into the air
    Low volume of hot wastewater released into the ocean
  • Lower fuel costs, reflecting lower resource use