ACCIONA Energía is expanding its battery energy storage portfolio in Spain with two new projects that will add a combined 33 MW of capacity. The systems, planned for Cuenca and Palencia, are expected to become fully operational by the end of 2027.
The first battery energy storage system (BESS) will provide 20 MW of power with two hours of storage, delivering 40 MWh of capacity. It will be located alongside the 50 MWp Bolarque solar photovoltaic plant in Villalba del Rey, Cuenca.
The second project will have a capacity of 13 MW and two hours of storage, providing 26 MWh. It will be installed near the 22 MW El Cuadrón wind farm, which spans the municipalities of Hornillos de Cerrato and Torquemada in Palencia.
Together, the projects will enable ACCIONA Energía to store surplus electricity generated during periods of high renewable output and dispatch it when electricity demand rises or renewable generation falls. This will help address the intermittent nature of solar and wind power while providing greater flexibility to the electricity grid.
Locating the BESS facilities near existing renewable generation assets will allow the company to make more effective use of clean electricity and support grid stability. Energy storage can also help reduce reliance on conventional fossil-fuel generation during periods of lower renewable production.
ACCIONA Energía has been developing battery storage solutions for several years. In 2017, the company commissioned what it described as Spain’s first grid-connected hybrid battery storage system at a wind farm in Barásoain, Navarre.
The company has also explored the use of second-life batteries. In 2024, it incorporated repurposed electric vehicle batteries into its storage operations at the Extremadura III solar complex in Almendralejo.
ACCIONA Energía’s storage expansion extends beyond Spain. In the United States, it operates the 190 MW/380 MWh Cunningham battery storage facility in Texas. In Chile, the company is developing a 200 MW/1 GWh storage system connected to the Malgarida solar plant.
The company has additionally announced a 196 MW/980 MWh battery storage project at the El Romero solar plant in Chile, with operations expected to begin by the end of 2027.
The two new Spanish projects add to ACCIONA Energía’s broader strategy of pairing renewable generation with energy storage. By combining batteries with solar and wind assets, the company aims to improve the availability of renewable electricity and contribute to a more flexible and reliable power system.
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