Outline of the Tomakomai Mill Hydropower Station

Abstract

Oji paper Tomakomai mill has nine hydropower stations in Hokkaido. Five of them are located in Chitose, two of them in Eniwa and other two of them in Niseko. The oldest one, Chitose No. 1 power station was built as a power source of the Tomakomai mill in 1910. With expansion of the mill, other four power stations were added in downstream, in 1916 to 1941. Even now these power plants are still working for power supply to the Tomakomai mill by executing careful maintenance. However, the plants have been deteriorating because they have been operated for 70-100 years. In order to intensify power generation business and contribute to low carbon society, Oji paper will refresh those hydropower stations in coming years. The refresh construction includes renewal of control drive unit, inlet-valve, guide-vane and runner. In this report, we introduce outline of each power station and brief overview of the refresh construction.