M501J/JAC Series

Large Capacity Gas Turbine - For 60Hz
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Cutting-edge large-capacity gas turbines for 60 Hz power generation
incorporating state-of-the-art technologies

Features

Standalone Gas Turbine Output
453 MW class
Combined Cycle Output
664 MW / 1,332 MW class
Combined Cycle Efficiency
More than 64%
Total commercial operating hours
Over 3.2 million hours
  • J Series as of December 2025
  • World-class combined cycle efficiency of over 64%.
  • High reliability with cumulative commercial operation time exceeding 3.2 million hours.
  • 30% hydrogen co-firing has been demonstrated, supporting the transition to carbon neutrality.
  • Reduces CO₂ emissions by approximately 65% compared to conventional coal-fired power plants.
Featured Case Studies

Shifting from Coal to Natural Gas, Creating a New Model for Sustainable Power Generation

In December 2020, Mitsubishi Power received an order for two M501JAC gas turbines for the Genesee Power Station owned by Capital Power, Upgrade Expected to Increase Power Output by 70%, Creating the Most Efficient Natural Gas-fired GTCC Power Plant in Canada.

Product Details

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 50 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

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Key Component Technologies

Compressor

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.

Combustor

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.

Turbine

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.

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Long-term Validation - T-POINT 2 Proving Ground for Gas Turbine Advancements

Mitsubishi Power has a unique design and validation approach, unlike any other Original Equipment Manufacturer (OEM). The current verification process for the J-series technology takes place at our grid-connected T-Point 2 commercial combined cycle power plant located at Takasago Machinery Works 1 km2 campus 48 km west of Kobe, Japan. In one single location, we house the four key pillars of validation: research and development, design, manufacturing, and full-scale validation. These turbine designs undergo long-term operation of at least 8,000 hours of validation, equivalent to nearly one year of normal operation.

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Hydrogen Capability

With Mitsubishi Power's hydrogen combustion technology, power plant owners can convert existing gas turbine combined cycle (GTCC) plants to hydrogen co-firing, reducing CO₂ emissions. In the future, it will also be possible to switch to 100% hydrogen combustion with minimal modifications.

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Configuration

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

Simple Cycle Performance

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

Combined Cycle Performance

M501JAC
1 on 1 Plant Output 664 MW
Plant Efficiency ＞64.0 %LHV
2 on 1 Plant Output 1,332 MW
Plant Efficiency ＞64.2 %LHV

Performance Correction Curves

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

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Effects of Barometric Pressure on Gas Turbine Performance (Typical)

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

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  • 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

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  • 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

Representative Example

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Photo courtesy of The Kansai Electric Power Co, Inc

The Kansai Electric Power Co., Inc.

Country/Region Japan
Plant Himeji No. 2 Power Station
Plant specifications × Qty Combined cycle × 6
Year of operation 2013 started

Capital Power Corporation

Country/Region Canada
Plant Genesee Generating Station Unit 1 and 2
Plant specifications × Qty Combined cycle × 2
Year of operation 2023 started

J-POWER USA

Country/Region USA
Plant Jackson Generation
Plant specifications × Qty Combined cycle × 2
Year of operation 2022 started

Other Delivery Records

Client / Plant Country/Region Year of starting operation Plant specifications × Qty
Comisión Federal de Electricidad (CFE) / Salamanca Mexico 2025 Combined cycle × 2
Suncor Energy Inc. / Suncor Baseplant complex Canada 2025 Combined cycle × 2
Alabama Power Co. / Barry Power Plant USA 2023 Combined cycle × 1
Power South Energy Cooperative / Lawman Energy Center Unit #1/2 USA 2023 Combined cycle × 1
Mexico Infrastructure Partners / Tamzunchale Ⅱ Mexico 2022 Combined cycle × 1

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