Grid Storage

Zermeiggern hydroelectric plant

Switzerland

14th-largest grid storage in Switzerland of 17 · top 97% worldwide (#927 of 965)

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Operator: Kraftwerke Mattmark
Owner: Centralschweizerische Kraftwerke AG (CKW), Axpo Solutions AG, City of Sitten, BKW Energie AG, ewl Kraftwerke AG, City of Sierre
Status: operating
Capacity: 74 MW
Technology: pumped storage
Commissioned: 1966
Also listed as: A power plant — this site generates as well as stores

Comparable grid storages · Switzerland · 17 ranked

#1Lago Bianco hydroelectric plant1.0 GW
#12Le Chatelard hydroelectric plant112 MW
#13Mottec hydroelectric plant89 MW
#14Zermeiggern hydroelectric plant74 MW
#15Rempen hydroelectric plant66 MW
#16Handeck III hydroelectric plant55 MW

All grid storages in Switzerland →

Grid connection · within 50 km

Nearest substation: Poste de Chippis
Its voltage: 380 kV
Distance: 38 km
Strongest line nearby: 380 kV
Line operator: Swissgrid
Substations in range: 1

Mapped grid infrastructure from OpenStreetMap, whose coverage is excellent in some regions and sparse in others. Nothing shown here means nothing is mappednearby — not that the site is unconnected. Lines are matched on a segment’s midpoint, so a corridor passing directly overhead can be missed; this under-reports rather than invents.

Co-located infrastructure · within 25 km

Stalden hydroelectric plant18 km · Power Plant · 185 MW · hydro
Lonza Visp Chemical Plant25 km · Chemical Plant

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Portfolio

All assets by Kraftwerke Mattmark →All assets by Centralschweizerische Kraftwerke AG (CKW) →All assets by Axpo Solutions AG →All assets by City of Sitten →All assets by BKW Energie AG →All assets by ewl Kraftwerke AG →All assets by City of Sierre →

Watercourse: Saaser Vispa

SOURCE: Global Energy Monitor · Global Integrated Power, March 2026 (CC BY 4.0)