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: 54 MW
Gross head: 480 m
Average annual production: 192 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

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:

81 MW

Shareholding:

81.97 %

Commissioning:

1952/1957/1981

Average annual production:

258 GWh

Guided tours:

Yes

Status:

In service

Certificate

TÜV SÜD

Annual Reports Energie Electrique du Simplon SA

Disclaimer: This annual report has been approved by the Board of Directors, and the annual financial statements have been reviewed by the statutory auditor. Approval by the General Meeting of Shareholders remains reserved.