Rhone Oberwald hydropower plant

Rhone Oberwald hydropower plant

Client  / Owner

FMV - Forces Motrices Valaisannes

Execution

2014 - 2018

Collaboration

BG as member of the IG-GO Joint Venture (SRP - BG - PRA - Group E).

Total costs

57.6 million EUR

Project description

Construction of a new hydropower plant on the Rhone River between Gletsch (1'750 m.a.s.l) and Oberwald (1'445 m.a.s.l).

The power plant is composed of the following installations:

  • Tyrolian water intake in the Rhone at Gletsch, which is followed by a sand trap and a forebay
  • Headrace tunnel (length 2'130 m to 13% slope, 3.50 m diameter, concrete lining and reinforced lining on last 650 m)
  • Underground power plant: 3'500 m3 volume cavern, two Pelton turbines
  • Tailrace tunnel and outlet works

Connection to the national power grid requires the construction of a 16 kV high voltage line.

Technical details of the scheme

  • Head : H = about 300 m
  • Flow rate : Q = 5.7 m3/s
  • Installed capacity : P = 14 MW
  • Power generation : E = about 41 GWh/year

Technical details of the retaining reservoir

  • Storage volume: 1'000 m3
  • Hight of the retention structure: 10 m
  • Hight of the retained water: 4.5 m

Services

  • Feasibility studies
  • Final design
  • Tendering and contracting
  • Detail design
  • Site supervision
  • Commissioning

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