M501J Series

Gas Turbines
  • Standalone Gas Turbine Output

    330-453 MW class

  • Combined Cycle Output

    484-664 MW class / 971-1,332 MW class

  • Combined Cycle Efficiency

    More than 64%

  • High Reliability Verified

    Cumulative total number of hours of operation as commercial unit:More than 1,700,000 hours
    (J-series Date as of Mar 2022)

Cutting-edge high-capacity gas turbines for 60 Hz power generation
incorporating state-of-the-art technologies

The J Series gas turbines are an integration of the proven G Series and elemental technologies for temperature increase as a result of the Japanese national project for the development of 1,700°C class gas turbines. They operate at a turbine inlet temperature of 1,600°C. The M501JAC Series gas turbines adopt air cooling for combustors instead of steam cooling. With a performance equivalent to the M501J Series gas turbines, they produce a high level of operability including a shorter start-up time.

Overall Design

The gas turbine unit is based on the basic structure adopted in the early 1970s that has accumulated a track record of at least 40 years. Its main features are as follows:

  • A compressor shaft end drive reduces the effect of thermal expansion on alignment
  • A rotor with simple single-shaft two-bearing support
  • A rotor structure has bolt-connected discs with the torque pins in the compressor section and CURVIC couplings in the turbine section to ensure stable torque transmission
  • An axial flow exhaust structure advantageous in combined cycle plant layouts
  • Horizontally split casings that facilitate field removal of the blades with the rotor in place


Advanced three-dimensional design techniques are used to improve performance while reducing the shockwave loss in the initial stages and frictional loss in the intermediate and final stages. The inlet guide vanes and variable stationary vanes at the first three stages are controlled to ensure stable operation at the start-up and enhanced performance at partial load in combined cycle operation.


The J Series combustor is based on the steam cooling system proven with the G Series. An improved fuel nozzle is used to help produce a more homogeneous mixture of fuel and air. Despite the rise in turbine inlet temperature, the combustor attains NOx emission concentration equivalent to that of the G Series.

Incorporating air-cooled combustors, the JAC series adds operational flexibility by eliminating any need for steam cooling from the bottoming cycle.


The turbine inlet temperature is 100°C higher than that of the G Series. However, the application of high performance cooling technologies developed in a Japanese national project for the development of 1,700°C class gas turbines and advanced thermal barrier coating (TBC) helps to maintain the metal temperature of the turbine blades at the level of conventional gas turbines.



M501J M501JAC
Compressor Number of Stages 15 15
Combustor Number of Cans 16 16
Cooling Method Steam Cooled Air Cooled
Turbine Number of Stages 4 4
Rotor Number of Rotors 1 1
Output Shaft Cold End Cold End
Rated Speed 3,600 rpm 3,600 rpm
Gas Turbine Approx. L × W × H 14.4 × 5.4 × 5.7 m 15.0 × 5.6 × 5.6 m
Approx. Weight 320 ton 347 ton

Simple Cycle Performance

M501J M501JAC
Frequency 60 Hz 60 Hz
ISO Base Rating 330 MW 453 MW
Efficiency 42.1 %LHV 44.0 %LHV
LHV Heat Rate 8,552 kJ/kWh 8,182 kJ/kWh
8,105 Btu/kWh 7,755 Btu/kWh
Exhaust Flow 620 kg/s 815 kg/s
1,367 lb/s 1,685 lb/s
Exhaust Temperature 635 °C 649 °C
1,176 °F 1,193 °F
Exhaust Emission NOx 25 ppm@15%O2 25 ppm@15%O2
CO 9 ppm@15%O2 9 ppm@15%O2
Turn Down Load 50 % 50 %
Ramp Rate 40 MW/min 42 MW/min
Starting Time 30 minutes 30 minutes

Combined Cycle Performance

M501J M501JAC
1 on 1 Plant Output 484 MW 664 MW
Plant Efficiency 62.0 %LHV >64.0 %LHV
2 on 1 Plant Output 971 MW 1,332 MW
Plant Efficiency 62.2 %LHV >64.2 %LHV

Performance Correction Curves

  • Effects of Compressor Inlet Temperature on Gas Turbine Performance (Typical)

  • Effects of Barometric Pressure on Gas Turbine Performance (Typical)


Typical Plant Layout - 1 on 1 configuration, single-shaft

  • Gas Turbines
  • Steam Turbines
  • Generators
  • Inlet Air Filter
  • Heat Recovery Steam Generator (HRSG)
  • Electrical / Control Package
  • Main Transformer
  • Condenser

Typical Plant Layout - 2 on 1 configuration

  • Gas Turbines
  • GT Generator
  • Steam Turbines
  • ST Generator
  • Inlet Air Filter
  • Heat Recovery Steam Generator (HRSG)
  • Electrical / Control Package
  • GT Main Transformer
  • ST Main Transformer
  • Condenser

Main Delivery Records


Himeji No. 2 Power Station, The Kansai Electric Power Co., Inc. (Japan)(Photo courtesy of The Kansai Electric Power Co, Inc.)
2,919 MW, 6 x M501J


PTK-2, Korea Western Power Co., Ltd. (Korea)
950 MW, 2 x M501J


Ulsan Power Plant, Korea East-West Power Co., Ltd. (Korea)
950 MW, 2 x M501J


Yulchon Power Plant, MPC Yulchon Generation Co., Ltd. (Korea)
950 MW, 2 x M501J

Recent Orders

Number of units x Series Year of start of operation Plant specifications
Greensville County Power Plant, Virginia Electric and Power Company (VEPCO) (USA) 3 × M501J 2018 Combined cycle
Noreste Power Plant, Comisión Federal de Electricidad (CFE) / Iberdrola (Mexico) 2 × M501J 2018 Combined cycle
Shin Pyeongtaek Power Co., Ltd. (Korea) 2 × M501J 2019 Combined cycle
Westmoreland Generating Station, Tenaska (USA) 2 × M501J 2019 Combined cycle
Noreste Power Plant, Comisión Federal de Electricidad (CFE) / Iberdrola (Mexico) 2 × M501J 2019 Combined cycle