Grid Storage

Handeck III hydroelectric plant

Switzerland

16th-largest grid storage in Switzerland of 17 · top 98% worldwide (#940 of 965)

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Operator: Kraftwerke Oberhasli AG (KWO)
Owner: Energie Wasser Bern (EWB), Industrielle Werke Basel (IWB), Elektrizitätswerk Der Stadt Zürich (EWZ), BKW Energie AG
Status: operating
Capacity: 55 MW
Technology: pumped storage
Commissioned: 1976
Also listed as: A power plant — this site generates as well as stores

Comparable grid storages · Switzerland · 17 ranked

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Grid connection · within 50 km

Nearest substation: Lavorgo
Its voltage: 400 kV
Distance: 45 km
Strongest line nearby: 380 kV
Line operator: SBB
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

Handeck I hydroelectric plant90 m · Power Plant · 100 MW · hydro
Handeck II hydroelectric plant329 m · Power Plant · 126 MW · hydro
Grimsel 4 hydroelectric plant5.4 km · Power Plant · 118 MW · hydro
Robiei hydroelectric plant25 km · Grid Storage · 192 MW

On the interactive map

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Portfolio

All assets by Kraftwerke Oberhasli AG (KWO) →All assets by Energie Wasser Bern (EWB) →All assets by Industrielle Werke Basel (IWB) →All assets by Elektrizitätswerk Der Stadt Zürich (EWZ) →All assets by BKW Energie AG →

Watercourse: Lake Räterichsboden

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