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Simplon storage power plant

The three power stations Tannuwald, Gabi and Gondo harness the water inflows from the catchment area south of the Simplon Pass to generate electricity. The water can be stored temporarily at the Fah, Eggen and Sera dams and made available as needed. The Gondo power station has been refurbished in recent years, and major renovations are pending at the  Tannuwald and Gabi power stations in upcoming years.

Tannuwald power station – alt. 1400 m

  • 7 Francis turbines

  • Total capacity: 5.6 MW

  • Gross head: 360 m

  • Average annual production: 17 GWh

Gabi power station – alt. 1300 m

  • 2 Pelton turbines + 1 Francis turbine

  • Total capacity: 11 MW

  • Gross head: 295 m

  • Average annual production: 38 GWh

Gondo power station – alt. 800 m

  • 3 Pelton turbines

  • Total capacity: 57 MW

  • Gross head: 480 m

  • Average annual production: 183 GWh

Eggen reservoir – alt. 1596 m

  • Built: 1957

  • Commissioned: 1958

  • Type: Embankment dam

  • Reservoir capacity: 50,300 m3

  • Catchment area: 57 km2

Fah dam – alt. 1758 m

  • Built: 1979

  • Commissioning: 1981

  • Type: Gravity dam

  • Height: 9 m

  • Crest: 48 m

  • Reservoir capacity: 41,000 m3

  • Catchment area: 17.3 km2

Sera dam – alt. 1278 m

  • Built: 1951, new construction in 2010

  • Commissioning: 1952

  • Type: Arch dam

  • Height: 22 m

  • Crest: 81.5 m

  • Reservoir capacity: 180,000 m3

  • Catchment area: 143 km2

Facts & figures

Plant type:

Storage power plant

Location:

Gondo, Gabi, Tannuwald, Switzerland

Number of turbines:

Tannuwald: 7 Francis turbines / Gabi: 2 Pelton turbines + 1 Francis turbine / Gondo: 3 Pelton turbines

Capacity:

74 MW

Shareholding:

81.9 %

Commissioning:

1952/1958/1978

Average annual production:

238 GWh

Guided tours:

Yes

Status:

In service

Certificates