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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 2017, the  Tannuwald power station in 2020 and the Gabi power station in 2023.

Tannuwald power station – alt. 1400 m

  • 2 vertical axis Pelton turbines

  • Total capacity: 8 MW

  • Gross head: 360 m

  • Average annual production: 22 GWh

Gabi power station – alt. 1300 m

  • 2 vertical axis Pelton turbines

  • Total capacity: 19 MW

  • Gross head: 295 m

  • Average annual production: 44 GWh

Gondo power station – alt. 800 m

  • 3 Pelton turbines (2 groups with horizontal axis, one group with vertical axes)

  • Total capacity: 53 MW

  • Gross head: 480 m

  • Average annual production: 198 GWh

Eggen reservoir – alt. 1596 m

  • Built: 1956 - 1957

  • Type: Embankment dam with bituminous coating

  • Reservoir capacity: 50,300 m3

  • Catchment area: 57 km2

Fah dam – alt. 1758 m

  • Built: 1979 - 1981

  • Type: Gravity dam in concrete

  • Height: 9 m

  • Crest: 48 m

  • Reservoir capacity: 41,000 m3

  • Catchment area: 17.3 km2

Sera dam – alt. 1278 m

  • 1951-1952, new construction in 2010

  • Type: double-curved concrete 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: 2 Pelton turbines / Gabi: 2 Pelton turbines / Gondo: 3 Pelton turbines

Capacity:

80 MW

Shareholding:

81.97 %

Commissioning:

1952/1957/1981

Average annual production:

258 GWh

Guided tours:

Yes

Status:

In service

Certificates