Unlocking the strategic potential of pumped hydro storage for Spains energy future
Pumped hydroelectric storage represents a significant yet underappreciated asset in Spains renewable energy landscape. As the demand for long-duration energy storage grows, this technology offers unique advantages in balancing the grid and supporting the integration of intermittent renewable sources.
Recent analyses by EY Spain highlight the potential for developing several gigawatts of pumped hydro capacity within the country. These projects could provide strategic benefits such as grid stabilisation, frequency regulation, and cost-effective energy storage, all critical for achieving Spains decarbonisation targets.
Despite its advantages, investment in pumped hydro remains limited compared to other storage technologies. Current subsidies and support measures tend to favour battery storage, with up to 50 percent of CAPEX covered, whilst pumped hydro receives only around 8 percent. This imbalance distorts technological neutrality and hampers the realisation of its full potential.
The discrepancy in support levels underscores the need for policy adjustments. Increasing focus on pumped hydro could unlock multiple gigawatts of capacity, helping to stabilise the grid amid the increasing share of variable renewable energy sources like wind and solar.
Expert insights from EY's Antonio Hernandez emphasise that integrating pumped hydro into Spains energy strategy requires concerted actions, including legislative support, financial incentives, and public awareness campaigns. Such measures would help optimise the investment landscape and encourage the deployment of this mature yet undervalued technology.
Furthermore, recent legislative developments such as Royal Decree-Law 7/2026 open new avenues for development, though they also raise questions about regulatory frameworks and market incentives needed to fully capitalise on pumped hydro investments.
Building on these insights, industry stakeholders argue that Spain has a unique opportunity to leverage pumped hydro storage as a key pillar in its energy transition. Properly harnessed, it can serve as a backbone for a resilient, low-carbon power system that aligns with European climate commitments.
Overall, recognising the strategic importance of pumped hydro storage and implementing targeted policies could transform Spain into a leader in long-duration energy storage, ultimately ensuring a more reliable, flexible, and sustainable energy future.