Kannagawa Hydropower Plant
|Kannagawa Hydropower Plant|
The upper Minamiaiki Dam
|Location||Nagano Prefecture and Gunma Prefecture|
|Status||In partial operation|
|Commission date||2005 (Unit 1)|
|Owner(s)||Tokyo Electric Power Company|
|Generation units||6 x 470 MW|
|Installed capacity||940 MW|
|Maximum capacity||2,820 MW|
The Kannagawa Hydropower Plant (神流川発電所) is an under construction pumped-storage hydroelectric power plant near Minamiaiki in Nagano Prefecture and Ueno in Gunma Prefecture, Japan. The power plant utilizes the Minamiaiki River along with an upper and lower reservoir created by two dams, the upper Minamiaiki Dam and the lower Ueno Dam. The power station in between the two dams will contain six 470 MW pump-generators for a total installed capacity of 2,820 MW. Unit 1 has commenced commercial operation in 2005, Unit 2 in 2012. When completed, the plant will have the second-largest (after Bath County Pumped Storage Station) pumped-storage power capacity in the world.
In July 1993, the Kannagawa Hydropower Field Survey Office was initiated and in July 1995, the power plant was approved by the Electric Power Development Coordination Council. In May 1997, construction on the project began and by October 2003, the area behind the Ueno Dam was being inundated with water and the next year, the Minamiaiki Dam's reservoir began to fill as well. Both dams were completed and the upper reservoir was filled by 2004.
The power station is 1,600 ft (490 m) underground and measures 708 ft (216 m) long, 108 ft (33 m) wide, and 169 ft (52 m) high. It will contain 6 x 470 MW pump generators for a total capacity of 2,820 MW. Water from the upper Minamiaiki Reservoir is transferred through the power house and after producing electricity, it is brought to the lower Ueno Reservoir. The pump-generators can then pump water from the lower reservoir back up to the upper reservoir for re-use in hydroelectric power production. The water tunnel connecting the two reservoirs is 3.8 mi (6.1 km) long. The power station also has an effective hydraulic head of 653 m (2,142 ft) and maximum discharge of 510 m3/s (18,000 cu ft/s). Unit 1 commenced commercial operation in 2005 and Unit 2 in 2012. The other four units are expected to be operational by 2020 or later.
The Minamiaiki Dam is located in Nagano Prefecture and is a 136 m (446 ft) high and 444 m (1,457 ft) long rock-fill dam. It is made of 7,300,000 m3 (9,500,000 cu yd) of material and withholds a 19,170,000 m3 (677,000,000 cu ft) reservoir. The Ueno Dam, in Gunma Prefecture, is a 120 m (390 ft) high and 350 m (1,150 ft) long concrete-gravity dam. It is made of 720,000 m3 (940,000 cu yd) of material and withholds a 18,400,000 m3 (650,000,000 cu ft) reservoir.
- HydroWorld: Unit 2 online at Japan's Kannagawa pumped-storage plant
- "Press Release: Commencement of Commercial Operation of Unit 1 of Kannagawa Hydropower Plant-- Pumped-Storage Power Plant with World's Largest Capacity". TEPCO. Dec 22, 2005. Retrieved 31 August 2010.
- Peltier, Robert (August 15, 2006). "Kannagawa Hydropower Plant, Japan". Power Magazine. Retrieved 31 August 2010.
- "Specifications of Kannagawa Pumped Storage Power Plant". IEAHydro. Retrieved 31 August 2010.
- "Annual Report 2010". TEPCO. Retrieved 31 August 2010.