Resonac Graphite Japan operates hydroelectric power plants in three locations: Aoki, Tokiwa, and Hirotsu.
The Hirotsu and Tokiwa Power station underwent a full renovation of their water turbines, generators, and control systems in 2016 after being in operation for 77 years. Similarly, the Aoki Power station renewed its water turbine, generator, and control systems in 2017 after 63 years of operation. Water way undergo annual inspection and maintenance to ensure smooth, continued operations for the next 80+ years. Sustainable operations of the water supply system are a direct result of diligent and collaborative efforts of Resonac Graphite Japan and the local community.

Aoki Power Station

Established:

1954

Maximum Output:

10,060 kw

Effective Head:

284 m

Maximum Water Capacity:

4.0 m³/s

Tokiwa Power Station

Established:

1941

Maximum Output:

11,400 kw

Effective Head:

69 m

Maximum Water Capacity:

17.8 m³/s

Hirotsu Power Station

Established:

1940

Maximum Output:

20,800 kw

Effective Head:

202 m

Maximum Water Capacity:

11.4 m³/s

Our water supply system was built between the completion of our Hirotsu Power Station and Aoki Power Station (1939-1954). Operating under authorized water rights, our system efficiently allocates local water resources to fulfill agricultural, household, and power generation needs. As owners of this water supply system, we play a crucial role in its management and operation.

Over the years, the system has become an integral part of the regional infrastructure, and even recognized within the "SDGs Future City Plan" of Omachi City. The social contributions through our water supply system extend to neighboring areas such as Ikeda Town, Matsukawa Village, and Azumino City (Akashina, Hotaka).