STORAGE 2025
Installed storage capacity
Information based on provisional data as of January 2026
Electricity storage is essential for integrating renewable energy generation and ensuring system stability, particularly in the context of strong growth in wind and solar photovoltaic power.
As of 31 December 2025, installed storage capacity in the Spanish electricity system stands at 3,427 MW. The vast majority still corresponds to pure pumped storage hydropower systems, with 3,331 MW of installed capacity, while batteries (although growing) still account for a small fraction of the total, at 96 MW.
The chart showing the evolution of installed storage capacity indicates an upward trend, albeit more moderate than that of renewables. This reflects the need to continue developing new storage technologies and projects to support the energy transition.
Evolution of installed storage capacity
The most relevant aspects of installed storage capacity by autonomous communities in 2025 include:
- Comunidad Valenciana has the highest installed pumped storage capacity, with 1,512 MW, which represents 44.1% of the national total.
- Andalucía and Cataluña are also noteworthy and rank second and third with 585 MW and 440 MW, respectively, in total installed storage capacity.
- As the community with the highest installed battery capacity nationwide, with 63 MW, Castilla-La Mancha accounts for more than half of the national installed capacity in this technology (96 MW across Spain).
Map of installed storage capacity by autonomous communities
Storage
Energy storage