Grimsel 2
Grimsel 2 pumped hydro overview.
Grimsel 2 is a pumped-storage station operated by Kraftwerke Oberhasli in the Bernese Oberland. Four machine groups transfer water between the Grimselsee and Oberaarsee, storing surplus electricity and generating when it is needed. A frequency-converter upgrade commissioned in 2013 enabled variable-speed pumping on one machine group.In OperationSwitzerland
At a Glance
Technical capacity
388 MWEnergy storage
Data coming soonOperator
Data coming soonCountry
SwitzerlandLocation
46.568°, 8.319°Website
Official project pageOwnership
1 record| Share | Organisation | Role | Details | Period |
|---|---|---|---|---|
| Unknown | Owner Operator | Kraftwerke Oberhasli owns and operates the Grimsel 2 pumped-storage station, which transfers water between Grimselsee and Oberaarsee. | Current / not dated |
Organisations
3 recordsOrganisations recorded as working on this asset or its project, and their role.
| Organisation | Role | Details |
|---|---|---|
| Historical variable-speed converter supplierEquipment Supply | Supplied the PCS 8000 frequency converter, controls, transformers, engineering, installation and commissioning for the variable-speed conversion of one existing machine group. | |
Kraftwerke Oberhasli AG | Operator | Not set |
| Pumped-storage station operatorOwner Operator | Operates the four-machine Grimsel 2 pumped-storage station within its Oberhasli hydropower system. |
Capacity history
Recorded project capacity figures. Future-dated changes are shown but are not used as current capacity.
| Effective | Capacity type | Capacity | Source |
|---|---|---|---|
| Current | Technical capacity | 388 MW | Swiss Federal Office of Energy WASTA — Grimsel 2 turbine rating, statistical reference 31 December 2025 |