Kazunogawa Pumped Storage Power Station
|Kazunogawa Pumped Storage Power Station|
The upper Kamihikawa Dam
|Commission date||Unit 1: 1999
Unit 2: 2000
Unit 3: 2024
Unit 4: 2014
|Construction cost||$2.2 billion USD|
|Pumped-storage power station|
|Upper reservoir||Kamihikawa Reservoir|
|Upper res. capacity||11,470,000 m3 (9,299 acre·ft)|
|Lower reservoir||Kazunogawa Reservoir|
|Lower res. capacity||11,500,000 m3 (9,323 acre·ft)|
|Hydraulic head||779 m (2,556 ft) (max)|
|Pump-generators||3 x 400 MW reversible Francis-type|
|Nameplate capacity||1,200 MW (installed)
1,600 MW (max. planned)
The Kazunogawa Dam (葛野川ダム) uses water from the Sagami River system to power a 1,200 MW pumped storage hydroelectric scheme. It is located 18 km (11 mi) east of Kōshū in Yamanashi Prefecture, Japan. The station is designed to have an installed capacity of 1,600 MW and three of the four 400 MW generators are currently operational. Construction on the power station began in 1993 and the first generator was commissioned on 3 December 1999. The second was commissioned on 8 June 2000. The third on become operational on 9 June 2014, six year early due to post-power demand from the Great East Japan Earthquake. The fourth and final generator is slate to be commissioned by 2024. It is owned by TEPCO and was constructed at a cost of $2.2 billion USD.
Design and operation
The upper reservoir for the power station is created by the Kamihikawa Dam at embankment type. It has a fill volume of 4,110,000 m3 (5,375,677 cu yd). The upper reservoir's capacity is 11,470,000 m3 (9,299 acre·ft) of which 8,300,000 m3 (6,729 acre·ft) is active (or "useful) for power generation.which is a 87 m (285 ft) tall and 494 m (1,621 ft) long rock-fill
When energy demand is high, water from the upper reservoir is released down to the underground power station via a single 3.3 km (2 mi) long headrace tunnel which splits into two 1.8 km (1 mi) tunnels before each separate into two 620 m (2,034 ft) long penstocks. Each penstock feeds a single reversible 400 MW Francis turbine-generator with water before it is released into a 3.3 km (2 mi) long tailrace tunnel which discharges into the lower reservoir, created by the Kazunogawa Dam. When energy demand is low and therefore inexpensive, the turbines reverse into pumps and send water from the lower reservoir back to the upper reservoir. The process is repeated when necessary to help balance electricity loads. The difference in elevation between the upper and lower reservoirs affords an effective hydraulic head of 714 m (2,343 ft) and maximum of 779 m (2,556 ft).
The Kazunogawa Dam is 105.2 m (345 ft) tall and 263.5 m (865 ft) long roller-compacted concrete gravity dam. It has a structural volume of 622,000 m3 (813,545 cu yd). The lower reservoir's capacity is 11,500,000 m3 (9,323 acre·ft) of which 8,300,000 m3 (6,729 acre·ft) is active (or "useful) for pumping into the upper reservoir.
- Fukashiro Dam – located downstream of Kazunogawa Dam
- List of pumped-storage hydroelectric power stations
- "Kazunogawa Hydroelectric Power Plant, Japan". Power-Technology. Retrieved 14 August 2011.
- "Kamihikawa" (in Japanese). DamSite. Retrieved 14 August 2011.
- "Kazunogawa" (in Japanese). DamSite. Retrieved 14 August 2011.
- "Outline of Kazunogawa Hydroelectric Power Station". TEPCO. 9 June 2014. Retrieved 14 July 2014.
- "Commercial Operation Commencement of Unit 4, Kazunogawa Hydroelectric Power Station". TEPCO. 9 June 2014. Retrieved 14 July 2014.
- Yoshikawa, Hiromichi. "A Huge Pumped-Storage Hydroelectric Power Plant on the Kazuno River -Effective Head of 714 m-". Musashi Institute of Technology. Retrieved 14 August 2011.
- "Kazunogawa Pumped-storage Power Station" (in Japanese). CKJ3D. 23 August 2009. Retrieved 14 August 2011.
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