Iberdrola has commissioned 2 battery energy storage systems of 60 MWh each, supporting 100 MW of solar capacity in Spain
The batteries can supply electricity for up to 2 hours to more than 13,000 homes
These projects are part of a wider 6-BESS portfolio, backed by €37.5 million in public funding under Spain’s PERTE program
Iberdrola, the Spanish energy giant, has commissioned 2 battery energy storage systems (BESS) of 60 MWh storage capacity each and a power of around 30 MW to support 100 MW solar PV capacity in Spain. Energized through its subsidiary Iberdrola España, the company calls them the largest operational batteries in the country.
The batteries installed in Alarcón (Cuenca) for the 50 MW Romeral and 50 MW Olmedilla solar projects can supply electricity for 2 hours to more than 13,000 homes. The 2 BESS systems comprise 6x4.5 MW converters and one 2.25 MW converter each, along with 13 battery modules of 4.66 MW each.
These are part of a set of 6 BESS, representing a combined 173 MW capacity. IDAE recognizes this BESS project as one of the Strategic Projects for Economic Recovery and Transformation (PERTE) under the renewable energy, green hydrogen, and storage (ERHA) category, and has awarded €37.5 million in funding. The Romeral battery alone received close to €8 million, while Olmedilla secured €3.5 million.
Of the 6 BESS, Iberdrola is building one in Castile and León as a hybrid project with the 50 MW Revilla-Vallejera Solar Power Plant. Another 2 systems will come up in Extremadura, where it operates C. Arañuelo I and II solar facilities, and one in Huelva, where Iberdrola has installed the Andévalo PV Plant.
Spain targets to achieve 22.5 GW energy storage capacity by 2030 under its Integrated National Energy and Climate Plan 2023-2030. In November 2025, the government issued a Royal Decree to accelerate its deployment (see Spanish Decree Boosts Energy Storage To Achieve 22.5 GW Target).