M701J Series

Gas Turbines
  • Standalone Gas Turbine Output

    440-570 MW class

  • Combined Cycle Output

    650-840 MW class

  • Combined Cycle Efficiency

    More than 64%

  • High Reliability Verified

    Cumulative total number of hours of operation as commercial unit:More than 1,000,000 hours

Cutting-edge high-capacity gas turbines for 50 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 development of 1,700°C class gas turbines. They operate at a turbine inlet temperature of 1,600°C.
Developed as a model with a similar design, the M701J Series for 50 Hz power generation began commercial operation at the beginning of 2016. The M701JAC Series gas turbines adopt air cooling for combustors instead of steam cooling. With performance equivalent to the M701J 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.



M701J M701JAC
Compressor Number of Stages 15 15
Combustor Number of Cans 22 22
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 3,000 rpm 3,000 rpm
Gas Turbine Approx. L × W × H 16.7 × 6.5 × 6.9 m 16.7 × 6.5 × 6.9 m
Approx. Weight 550 ton 550 ton

Simple Cycle Performance

M701J M701JAC(2015) M701JAC(2018)
Frequency 50 Hz 50 Hz 50 Hz
ISO Base Rating 478 MW 574 MW 448 MW
Efficiency 42.3 %LHV 43.4 %LHV 44.0 %LHV
LHV Heat Rate 8,511 kJ/kWh 8,295 kJ/kWh 8,182 kJ/kWh
8,067 Btu/kWh 7,826 Btu/kWh 7,755 Btu/kWh
Exhaust Flow 896 kg/s 1,024 kg/s 765 kg/s
1,977 lb/s 2,181 lb/s 1,687 lb/s
Exhaust Temperature 630 °C 646 °C 663 °C
1,166 °F 1,201 °F 1,226 °F
Exhaust Emission NOx 25 ppm@15%O2 25 ppm@15%O2 25 ppm@15%O2
CO 9 ppm@15%O2 9 ppm@15%O2 9 ppm@15%O2
Turn Down Load 50 % 50 % 50 %
Ramp Rate 58 MW/min 66 MW/min 53 MW/min
Starting Time 30 minutes 30 minutes 30 minutes

Combined Cycle Performance

M701J M701JAC(2015) M701JAC(2018)
1 on 1 Plant Output 701 MW 840 MW 650 MW
Plant Efficiency 62.3 %LHV >64.0 %LHV >64.0 %LHV
2 on 1 Plant Output
Plant Efficiency
Starting Time

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


Kawasaki Thermal Power Station Units 1 and 2, TEPCO Fuel & Power, Inc. (Japan)
3,420 MW, 4 x M701G2 & 2 x M701J

Recent Orders

Number of units x Series Year of start of operation Plant specifications
Kawasaki Thermal Power Station Unit 2, TEPCO Fuel & Power, Inc. (Japan) 2 × M701J 2016 Combined cycle