In a significant step for hydropower modernization, Voith has been awarded a contract by Iberdrola Generación S.A. to upgrade two additional pump-turbines at the Torrejón pumped-storage power plant in Spain. This new agreement builds on an ongoing collaboration, following the modernization of units 3 and 4, which Voith was contracted to update in 2020.
The latest contract covers the remaining two units—pump turbines 1 and 2—each with a capacity of 32.5 MW in turbine mode and 43 MW in pump mode. Work is scheduled to begin in 2027, with initial commissioning planned for 2028. Like their predecessors, these units will be designed for variable-speed operation, a key upgrade that enhances flexibility and efficiency.
Why Variable-Speed Matters
Modernizing to variable-speed operation is a game-changer for pumped-storage plants. Unlike traditional fixed-speed units, variable-speed turbines can respond more dynamically to fluctuations in the power grid. This allows for:
- Improved controllability – faster reaction to grid demands
- Efficiency gains – in both pump and turbine modes
- Better integration of intermittent renewable energy sources like solar and wind
As part of the modernization, Voith is adapting key plant components to meet the requirements of variable-speed operation. This ensures the turbine sets can operate more flexibly, maximizing the plant’s potential and contributing to grid stability.
A Trusted Partnership
The decision to proceed with the second phase was driven by positive experiences during the first modernization project. Fernando Perán Montero, Project Director at Iberdrola Generación S.A. , stated: “The modernization allows us to respond better to changing grid requirements and to better maximize the plant’s potential. For the implementation, we can build on the positive experiences gained during the first phase of the project. This made the decision to move forward to the next step much easier.“
Andi Schmiedel, Head of Proposal at Voith Hydro, added: “Such modernizations require a deep understanding of the plant and its integration into the overall system. We look forward to contributing our proven expertise here and continuing to implement the modernization of the site together with Iberdrola.”
Strengthening Hydropower’s Role
The Torrejón plant modernization is part of a broader trend to upgrade existing hydropower infrastructure. By adapting proven facilities to new grid requirements, these projects strengthen the role of hydropower as a flexible and reliable component in the energy system. This is particularly crucial as countries integrate higher shares of variable renewables, requiring fast-responding and efficient storage solutions.
This project also highlights the growing global focus on pumped storage. From India’s largest pumped storage plant being equipped by ANDRITZ to new projects in Switzerland and South Korea, the industry is clearly investing in this mature yet increasingly vital technology.
Looking Ahead
With work set to start in 2027 and commissioning in 2028, the Torrejón modernization is a long-term investment in sustainable energy infrastructure. It demonstrates how collaboration between technology leaders like Voith and energy companies like Iberdrola can extend the life and enhance the performance of existing assets, supporting the transition to a more resilient and low-carbon energy future.
