Press Information

MHI Completes First Unit of "STG System" -- Most Recent Type of "MERS"
A High-efficiency Waste Energy Recovery Power Generation System,
Utilizing Exhaust Gas from Marine Engines


Tokyo, March 30, 2010 - Mitsubishi Heavy Industries, Ltd. (MHI) has completed its first unit of the "STG (Super Turbo Generating) System," a marine-use, high-efficiency, combined power generation system that utilizes waste heat and the exhaust gas from diesel engines. Incorporating the company's proprietary controlling system, which enables optimized power generation by both exhaust-gas power and steam turbines, the STG System reduces the fuel cost of vessels by 10%, effectively recovers exhaust gas energy and ultimately contributes to efforts to prevent global warming. The STG System is the most recent type of the company's MERS (Mitsubishi Energy Recovery System) that utilizes waste energy from marine diesels for power generation.

[First unit of STG System - Most recent type of MERS]
The first STG System will be installed in a container vessel currently being built by Daewoo Shipbuilding & Marine Engineering Co., Ltd. of Korea, and will be delivered to A.P. Møller - Mærsk A/S, a Danish shipping company, in 2011. Celebrating the completion of the first unit, a ceremony was held today at the Nagasaki Shipyard & Machinery Works of MHI.

MHI has already received orders for 38 units of the STG System and at present is also receiving many business inquiries for the same. Many of these orders and inquiries are for use on container vessels, which carry numerous energy-consuming refrigeration/chilling container units. With the successful completion of the first unit, MHI plans to reinforce its marketing activities targeting newly-built vessels.

The STG System comprises an exhaust gas power turbine, an economizer (exhaust gas boiler), a steam turbine, a generator, a reduction gear box and an SSS (synchronous self-shifting) clutch and control system. MHI leverages its technological expertise as a major shipbuilding company handling essential components for marine-use waste energy recovery systems such as diesel engines, turbochargers, steam turbines and boilers for the new, energy-saving STG System.

Going forward MHI continues to develop innovative and environmentally-friendly products and systems enabled by the company's comprehensive technology and know-how, to propose new and better solutions to customers in the shipbuilding market.

About MHI Group

Mitsubishi Heavy Industries (MHI) Group is one of the world’s leading industrial groups, spanning energy, smart infrastructure, industrial machinery, aerospace and defense. MHI Group combines cutting-edge technology with deep experience to deliver innovative, integrated solutions that help to realize a carbon neutral world, improve the quality of life and ensure a safer world. For more information, please visit or follow our insights and stories on