Renewable Energy
General Hydropower Station
In order to utilize renewable energy effectively, Chugoku EPCO construct and operate various types of hydropower station such as Conduit-type, Dam and Conduit-type, and Dam-type.
Dam and Conduit-type
- Shibakigawa Daiichi power station (24MW) is a dam and conduit-type power station. (COD in 1957)
- It has the largest capacity of power stations which adopt a pelton wheel in Japan.
- Its penstock pipe is 1,420m long, which is the longest among our hydro power stations.
Shibakigawa Daiichi power station
Dam-type
- Takano power station (140kW) is a dam-type power station. (COD in 2013)
- It generates electricity by maintenance flow discharge of Koubo dam.
Takano power station
Pumped Storage Power Station
Chugoku EPCO have three pumped storage power stations to supplement the shortage of electric power supply at the peak of the demand.
Shin-Nariwagawa Power Station
- Shin-Nariwagawa Power Station was completed in 1968 as our company's first pumped storage power plant.
- At the time, it was one of the largest pumped storage power plants in Japan.
Shin-Nariwagawa dam(Gravity arch dam)
Nabara Power Station
- Nabara power station is a pure pumped storage power plant located only 20 km away from the downtown of Hiroshima City.
- At the time of completion, the dam had the largest single-capacity power generator and electric motor in Japan.
Nabara dam Lower reservoir dam with a rock-fill dam
Matanogawa Power Station
- The upper regulating reservoir is a rock-fill dam and the lower regulating reservoir is a gravity dam.
- It has the largest generation output among our pumped storage power plants and it is one of the largest in Western Japan.
Overview of Power Stations
| Shin-Nariwagawa | Nabara | Matanogawa | |
|---|---|---|---|
| The river and river system |
Takahashi river system Nariwa river, Shimogo river |
Oota river system Nabara river |
Hino river system Matano river Asahi river system Doyou river |
| Start of power operation |
1968 | 1976 | 1986/1987/ 1995/1996 |
| Generation type | Mixing pumped storage type | Pure pumped storage type |
Pure pumped storage type |
| Output | 303MW | 620MW | 1,200MW |
| Discharge | 424m3/S | 254m3/S | 300m3/S |
| Head | 84.7m | 294m | 489m |
Dams
Chugoku EPCO has so far constructed 30 dams (15m or over in height).
Oudomari dam(Gravity dam)
- The original height was 64m when it was first constructed in 1935.
- The dam height was raised by 10.5m in 1959, nearly doubling the effective storage capacity.
- The revolutionary method for raising the dam height received international attention.
Gravity dam
Sasanamigawa dam(Arch dam)
- The nation's first thin dome type arch dam which was constructed in 1959.
- This is the first arch dam at Chugoku EPCO.
Arch dam
Onbara dam(Buttress dam)
- The dam was completed in 1928, and it is registered as a national tangible cultural property for its contribution to the historical landscape.
- This dam was built using the buttress method.
Buttress dam
Overview of Dams
| Oudomari (Gravity dam) |
Sasanamigawa (Arch dam) |
Onbara (Buttress dam) |
|
|---|---|---|---|
| Height | 74m | 67.4m | 24.03m |
| Length of top of dam | 155m | 127.339m | 93.64m |
| Designed flood discharge | 804m3/S | 700m3/S | 70m3/S |
| Catchment area | 123.7km2 | 91.45km2 | 9.25km2 |
| Normal water level | E.L.532.5m | E.L.192m | E.L.737.96m |
| Reservoir capacity | 31,100,000m3 | 20,100,000m3 | 2,946,300m3 |
Construction and Operation Technology of Photovoltaic Power Plant
- We regard environmental efforts such as global warming as one of the important issues and implement initiatives aimed at realizing a low-carbon society.
- As part of our efforts, we are promoting the introduction of renewable energy and building 2 solar power stations on the coast of the Seto Inland Sea and operating.
Fukuyama Photovoltaic Power Station
Ube Photovoltaic Power Station
| Fukuyama Photovoltaic Power Station | |
|---|---|
| Location | Fukuyama City, Hiroshima Prefecture |
| Output | 3,000kW |
| Electric energy generated per year | Approx. 3,680MWh |
| CO2 reduction amount | Approx. 2,100 t-CO2 /year |
| Construction | October 2010 |
| Start of power operation | December 2011 |
| Solar cell area | 4.5ha |
| Number of modules | 16,544 sheets |
| Ube Photovoltaic Power Station | |
|---|---|
| Location | Ube City, Yamaguchi Prefecture |
| Output | 3,000kW |
| Electric energy generated per year | Approx. 3,520MWh |
| CO2 reduction amount | Approx. 2,000t-CO2／year |
| Construction | October 2013 |
| Start of power operation | December 2014 |
| Solar cell area | 4.0ha |
| Number of modules | 12,690 sheets |