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Mitsubishi Energy Recovery Systems (MERS)

ATD52 type

The Mitsubishi Energy Recovery System (MERS) is a revolutionary energy-saving power generation system that recovers and reuses energy from the main engine's exhaust gas. MERS optimizes thermal efficiency by automatically adjusting the output according to on-board electricity demand.

Main Features

  • Easy operation
    • - Fully remote automation
  • Easy installation
    • - Supplied as a complete package
  • Highly reliable
    • - Plant monitoring system
    • - Performance diagnosis
  • Compact design
  • Economical and environmentally friendly
    • - Reduces diesel generator fuel consumption and in some cases allows diesel generators to be stopped
    • - Optimizes thermal efficiency by controlling the output and load balance of the steam and power turbines


MHI-MME is the only company in the world that designs and manufactures an entire waste heat recovery system. Customers can receive all the benefits of dealing with a single supplier, including improved system performance and cost competitiveness, as well as post-delivery adjustments and maintenance.


STG (super turbo generating) system

STG (super turbo generating) system

The exhaust gas partially extracts from thje main engine exhaust gas, then it drives the Exhaust Gas Power Turbine, which is connected to the steam turbine with an SSS Clutch. The power generation amount is 2.4 to 2.8 times more rhan the Eco-TG System (without gas bypass). In case the STG power generation exceeds an electric demand in the vessel, the surplus power can assist the propeller shaft through shaft motor to reduce the main engines fuel consumption.

PTG (power turbine generating) system

STG (super turbo generating) system

Exhaust gas extracted from the main engine is used to drive the power turbine generator, eliminating the need for a large exhaust gas economizer, steam turbine, and vacuum condenser.
The PTG system is compact and can be retrofitted.

Eco-TG system (with gas bypass)

STG (super turbo generating) system

With partially extracting the exhaust gas from the main engine to the economizer, This engine realized more power generation by increasing the economizer's steam amount and temperature.
This power generation amount is 1.5 to 1.8 times more power than the Eco-TG System(without gas bypass).

Eco-TG system (without gas bypass)

STG (super turbo generating) system

This is a conventional system that has been applied to the turbine generators currently in service.

Following the turbocharger, all exhaust gas is led to the economizer and then steam -driven to the generator turbine.

Lineup and Specifications

Mitsubishi Power Turbine

Max. output (kW) 800 1,200 1,400 2,200 3,500


Single PressureDual Pressure
0.6~2.2MPa 0.6~2.2MPa, 0.3~1.0MPa
Type 1 2 3 4 5
System Single Pressure Type Dual Pressure Type
+HP Evaporator
+LP Evaporator
+HP Evaporator
+LP Evaporator
HP Superheater
+HP Evaporator
+LP Superheater
+LP Evaporator

After-Sales Services


Featured service menu:

For Turbines
To cope with high fuel costs, it is vital to maintain a high turbine efficiency. MHI-MME provides various solutions to keep your turbines in optimal condition and reduce your operating costs.

Generator turbine dock maintenance items

MHI-MME can provide a recommended dock maintenance parts list for the generator turbine that covers the docking schedule of each ship for the next 20 years. The list helps you to figure out what maintenance is required when your ship is docked.

Provision of finished MSV and RV spare parts

MHI-MME recommends inspecting the condition of main stop valves (MSV) and regulating valves (RV), which are critical turbine parts. These parts should be checked regularly every time you dock your ship to check for progressive aging deterioration caused by exposure to high pressure, high temperature conditions and the high number of moving parts.
Place an order with MHI-MME for the required parts and we will have the parts ready for you when you commence your dock maintenance work.

Updating the shaft vibration and position monitor

The VM-3 model has been discontinued and maintenance is no longer available. However current monitors can be replaced by the new VM-5 model without any modifications to your system.

Landed overhaul of MSV, RV, and power cylinder assembly

Main stop valves (MSV) and regulating valves (RV) play an important role in regulating the turbine steam. These parts need to be inspected and/or replaced during the overhaul inspection procedures carried out while the ship is docked.
MHI-MME will perform an overhaul inspection at our factory for vessels that have been in service for over 15 years as a preventive measure.

Renewal of turbine observation panel

The turbine observation panel is equipped with alarms indicating abnormal turbine operation such as low pressure and high turbine exhaust pressure.
MHI-MME recommends that the turbine observation panel be replaced in vessels that have been in service for 10 years or more.

Preparation of spare parts for governor driving gear

MHI-MME has verified that governor driving shaft worm gear pitching occurs in the worm wheel gear, causing damage and making it necessary to replace parts frequently.
We have therefore prepared a stockpile of spare parts to provide support in the case of gear damage.

Provision of finished MSV and RV spare parts at the depot

Main stop valves (MSV) and regulating valves (RV), which are critical turbine parts, have many moving parts and are subject to high pressure and high temperatures. These parts are overhauled while the ship is docked to check for deterioration.
MHI-MME provides a complete set of MSV and RV spare parts and can replace any part in the case of failure. We will also recondition the replaced parts and redeliver them as finished spare parts.

Rotor-gear spare parts stocked at the depot

Turbine rotors, blades and gears are critical parts. We strongly recommend our users to store a complete rotor and gear assembly as common spare parts.

Service Partners

For Boilers




TMC (Turbo Marine Consult ApS)



United Kingdom

Harris Pye United Kingdom Ltd

Middle East

Dubai (UAE)

Harris Pye Gulf L.L.C.



Suzhou Harris Pye Equipment Repair Co. Ltd


Harris Pye Japan Co., Ltd.


Harris Pye Singapore Pte Ltd



Harris Pye Australia Pty

South America



For Turbines


AC-Marine Engineering Pte Ltd


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