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.

Conduit-type

  • Okutsu Daini power station (15.2MW) is a conduit-type power station. (COD in 2002)
  • It is located on 75.9m underground, which is the deepest semi-basement power station in Japan.

Okutsu Daini power station

Okutsu Daini power station

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

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

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 in1968 as our company's first pumped storage power plant.
  • At that time, this power plant was one of the nation's largest-scale river / pumped storage power stations with high generating capacity.

Shin-Nariwagawa dam(Gravity arch dam)

Shin-Nariwagawa dam(Gravity arch dam)

Nabara Power Station

  • Nabara power station is a pure pumped storage power plant located only 20 km from the downtown of Hiroshima City.
  • Our first rock-fill dam structure was applied to the upper and lower reservoir dams.

Nabara dam Lower reservoir dam with a rock-fill dam

Nabara dam Lower reservoir dam with a rock-fill dam

Matanogawa Power Station

  • The upper reservoir dam with a rock-fill dam structure and the lower reservoir dam with a concrete gravity dam structure were constructed, creating the water head of 489m.
  • This power station has the highest level of generating capacity 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).

Oodomari dam(Gravity dam)

  • The height of this dam was 64 m when it was 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

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

Arch dam

Onbara dam(Buttress dam)

  • This dam, which was completed in 1928, has a rare buttress structure.
  • Buttress dams are an unusual type, and there are used at only 2 locations at Chugoku EPCO.

Buttress dam

Buttress dam

Overview of Dams

Oodomari
(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

Fukuyama Photovoltaic Power Station

Ube 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
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