Notification of Start of Business Service of Hydraulic Power Station(Kumamoto / Naidaijingawa Power Station)

  • Press release
  • UP
  • jnc

JNC CORPORATION (Chiyoda-ku, Tokyo, CEO & President: Keizo Yamada) announces the completion of renovation of the hydraulic power station owned by JNC in Kamimashiki-gun,Kumamoto, and its new start of business service.

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JNC Group regards the environment and energy group as an important business domain. We own hydraulic power stations (total maximum output of 97,600 kW) in 13 places and photovoltaic power stations (total maximum output of 16,000 kW) in 4 places in Japan for developing the power generation business using renewable energy.

Among the hydraulic power stations undergoing large-scale renovation since 2013, the Naidaijingawa Power Station has started business service. This is the ninth station undergoing large-scale renovation to start business service. By renewing the water turbines and generators to high-efficiency equipment, the maximum output was increased by 700 kW (about 10%) while keeping the approved water intake amount. JNC will take advantage of the power generation technologies cultivated so far to contribute to the society by supplying stable energy in future years with consideration for the environment.

All of our hydraulic power stations adopt a "run-of-river type" system. In this system, foreign matters are removed from river water, the water is guided via a channel into a head tank and dropped through a penstock to turn a water turbine for generating electricity. Since the run-of-river type hydraulic power generation does not require a large-scale dam, it is friendly to the environment, has low carbon dioxide emission and provides precious, purely domestically-produced energy.

<Outline of Naidaijingawa Power Station>

(1) Location


(2) Maximum output

Before renovation

7,300 kW

After renovation

8,000 kW (annual power generation amount for about 11,700 houses)

(3) Investment

About 4.8 billion yen

(4) Start of construction work

April 2018

(5) Start of business service

January 1, 2021