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ENVIRONMENTAL ASPECTS:


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Environmental

Daini Numazawa, Japan
Positive sustainability aspect
Passage of aquatic species
An acoustic device installed during the construction of the Daini Numazawa pumped storage power plant in Japan deters migratory fish (particularly Kokonee salmon) from entering the intake structure at the upper reservoir, minimising mortality of migratory species.

Source: IEA Hydropower Implementing Agreement - Annex VIII.
tab1 Overview tab2 Details tab3 Other Aspects tab4 Further Information tab5
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Overview

Daini Numazawa is a pumped storage power plant on the Tadamigawa River, Japan. Water is pumped from a lower altitude run-of-river reservoir during periods of excess flow into Lake Numazawa and is subsequently fed through turbines at the Miyashita Power Plant. The scheme has an effective head of 220 m, a maximum discharge of 250 m3 and a maximum output of 460 MW.

The Tadamigawa River is part of the Aganogawa River system. At 210 km in length, with a catchment area of 7,710 km2 it is one of the largest rivers in Japan. It boasts a series of dams to maximise hydroelectric generating capacity. Tohoku Electric Power Company manages five dams in this system, generating 60% of their hydroelectric power.

Scheme Specifications

Dam name
Scheme operator
Tohoku Electric Power Company
 Size of scheme (MW)
460
Country
Japan
 Catchment area
7,710 km2
River
Tadamigawa
 Effective reservoir capacity
Upper reservoir  44.7 x 106 m3
Lower reservoir 6.1 x 106 m3
Construction years
1977-1981
 Reservoir size
Upper reservoir 3.1 km2Lower reservoir 1.45 km2
hometop
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