Voith has been awarded a contract by Kraftwerke Oberhasli AG (KWO) to supply electromechanical equipment for the Grimsel 4 pumped storage project in Switzerland.

The contract covers the supply and installation of two variable-speed pump turbines, each rated at 70MW, along with associated motor generators. The new units are intended to increase both pumping and generation capacity at the Grimsel site and support grid stability and renewable energy integration.

The award represents the first major new-build contract between Voith and KWO. The company said its competitive offer and a technical concept based on a tested hydraulic design were key factors in securing the order, reducing technical risk and supporting project delivery.

“Grimsel 4 is an important step in further developing our storage capacity and strengthening system flexibility. Voith’s technically convincing solution and the constructive collaboration throughout the tender phase were key factors in our decision. We look forward to continuing the partnership during project execution,” said Ueli Gasser, Project Manager for Electromechanical Installations at Grimsel 4 at Kraftwerke Oberhasli AG.

“We are proud to support Kraftwerke Oberhasli AG with the Grimsel 4 project and further expand our footprint in Switzerland. The close collaboration throughout the tender phase laid a strong foundation, and we look forward to continuing this partnership during project execution,” added Aleksandar Glamoclija, Key Account Manager Germany at Voith Hydro.

Grimsel 4 forms part of Switzerland’s broader push to expand flexible energy storage capacity as renewable generation increases. For Voith, the project strengthens its position in the Swiss hydropower market.

KWO, founded in 1925, operates 13 hydroelectric plants and eight reservoirs, producing between 2,200 and 2,400 GWh of electricity annually. The company supplies both base-load and peak-load power and plays a role in grid stability in Switzerland and across Europe.

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