Voith Grimsel 4 pumped storage project marks a significant step in expanding Switzerland’s energy storage capacity, with Voith awarded a contract by Kraftwerke Oberhasli AG (KWO) to supply key electromechanical equipment for the new facility.
The project includes the delivery and installation of two variable-speed pump turbines, each with a capacity of 70 MW, along with associated motor generators. The new units will increase both pumping and generation capacity at the Grimsel site.
Voith Grimsel 4 pumped storage project supports renewable integration
Pumped storage hydropower plays a critical role in balancing electricity grids, particularly as renewable energy generation increases. The Grimsel 4 development is designed to provide flexible storage and grid stabilisation services, helping to manage fluctuations in supply and demand.
The use of variable-speed technology allows more precise control of operations, improving efficiency and enabling better integration of intermittent renewable sources such as wind and solar.
First major new-build collaboration between Voith and KWO
The contract represents the first major new-build project awarded to Voith by KWO, marking an important milestone in the relationship between the two organisations.
According to the project partners, Voith’s competitive offer and technically robust concept were key factors in securing the order, with the design based on proven hydraulic engineering to reduce technical risk and support reliable delivery.
Ueli Gasser, Project Manager for Electromechanical Installations at Grimsel 4, said the project will play a key role in strengthening system flexibility and expanding storage capacity.
Aleksandar Glamoclija, Key Account Manager Germany at Voith Hydro, highlighted the importance of the collaboration and the opportunity to further develop the company’s presence in the Swiss hydropower market.
Strengthening Switzerland’s hydropower infrastructure
Switzerland relies heavily on hydropower as part of its energy mix, with pumped storage facilities providing essential flexibility for the national grid. Projects such as Grimsel 4 are expected to play an increasingly important role as energy systems transition towards lower-carbon sources.
By expanding storage capacity and improving operational flexibility, the project contributes to long-term energy security and supports the continued growth of renewable generation.
For more hydropower and energy infrastructure developments, visit our Hydropower coverage.
