Mitsubishi Power, a major subsidiary of Mitsubishi Heavy Industries (MHI) Group, which was conducting a renovation project of the Otake Geothermal Power Station (Kokonoe-machi, Oita Prefecture) operated by Kyushu Electric Power Company, has declared completion of its work. Already, the commercial operation of the renovated facility has begun in October 2020. The stable electric power supply generated by the highly efficient and reliable steam turbine installed as part of this renovation project will curb CO2 emissions, and contribute to a decarbonized economy.
This project was conducted under an Engineering, Procurement and Construction (EPC) contract by a joint venture comprising Mitsubishi Power, which supplied the steam turbine, Mitsubishi Power Industries Co., Ltd., which handled the supply and installation of auxiliary equipment, and Mitsubishi Electric Corporation, which supplied the generator and electrical facilities.
The uniqueness of the project is: the power generation system there utilizes a ‘double flash and dual pressure’ method, the first of its type in Japan. This allows for stable operation of the steam well and efficient use of geothermal resources. It has also increased the power output by two megawatts (MW) compared to the previous facility, to 14.5MW. The construction has been completed two months ahead of the schedule from the plan when work began in May 2019, allowing for the start of commercial operation
Mitsubishi Power has fulfilled orders for more than 100 projects in the geothermal power field in 13 countries.