Voith has strengthened its partnership with Iberdrola Generación SA after securing a follow-on contract to modernize two additional pump-turbines at the Torrejón pumped-storage hydropower plant in Spain. The latest award marks another important milestone in the ongoing upgrade programme aimed at improving operational flexibility, efficiency, and grid stability at the facility.
The contract covers the modernization of pump-turbines 1 and 2, following the successful commencement of upgrade works on units 3 and 4. By extending the modernization programme across all four units, Iberdrola is positioning the facility to play an increasingly important role in supporting Spain’s growing renewable energy sector and the evolving demands of the electricity grid.
Each of the two pump-turbines included in the latest contract has a generating capacity of 32.5 MW in turbine mode and 43 MW in pumping mode. Work on the new phase is scheduled to begin in 2027, with commissioning of the upgraded units expected in 2028.
A key aspect of the project involves converting both units to variable-speed operation. This technology enables the pump-turbines to respond more effectively to fluctuations in electricity supply and demand, providing greater flexibility in balancing the grid. As renewable energy generation from sources such as wind and solar continues to expand, the ability to rapidly adjust power output and energy storage capacity is becoming increasingly valuable.
Voith will also adapt critical plant components to support the new operating mode, ensuring seamless integration with the facility’s existing infrastructure. The modernization is expected to enhance the long-term reliability and efficiency of the pumped-storage plant while improving its ability to support renewable energy integration.
Pumped-storage hydropower remains one of the most effective large-scale energy storage technologies available, providing a dependable solution for managing intermittent renewable energy generation. By storing excess electricity during periods of low demand and releasing it when demand rises, these facilities help maintain grid stability and improve energy security.
According to Voith, the successful execution of such projects requires extensive technical expertise and a deep understanding of both hydropower systems and grid operations.
“Such modernizations require a deep understanding of the plant and its integration into the overall system,” said Andi Schmiedel, Head of Proposal at Voith Hydro. “We look forward to contributing our proven expertise here and continuing to implement the modernization of the site together with Iberdrola.”
The continued investment in the Torrejón facility reflects the growing importance of modern hydropower infrastructure as countries accelerate their energy transition strategies. As electricity networks increasingly rely on renewable energy sources, advanced pumped-storage facilities are expected to play a critical role in ensuring reliable, flexible, and sustainable power generation for the future.
