Spain Solar Farm Signs Contract to Integrate Battery Storage

Spain has signed its first power purchase agreement (PPA) to integrate battery energy storage systems (BESS) with an operational solar farm. On Jan. 7 (local time), renewable energy firm Zelestra and energy company EDP officially announced the agreement for the Pizarroso solar farm in the Caceres region. This contract involves integrating a 160 MWh energy storage system with the solar farm.

The integration will allow electricity generated by solar power to be stored and supplied when needed, even when the sun is not shining, thereby increasing the utilization of renewable energy and contributing to grid stabilization.

This agreement entails adding a 160 MWh battery to the Pizarroso solar farm (50 MW) in Spain's Caceres region, which has been in operation since 2023. EDP, the power off-taker for the Pizarroso farm, can adjust its energy supply patterns and respond to grid demand by storing electricity generated during peak daytime solar production and releasing it during high-demand periods through the battery integration.

This business model is advantageous in terms of speed and cost, as it utilizes existing infrastructure without the need to secure new sites or go through lengthy permitting processes. It reflects a current trend in renewable energy investment, shifting from expanding new facilities to enhancing the operational efficiency of existing assets.

Zelestra and EDP previously signed Spain's first integrated solar and battery PPA in 2025, which focused on building new facilities totaling 170 MW of solar capacity and 400 MWh of storage. The latest contract represents an evolution in the business model, adding batteries to already operational assets. This approach is considered a leading technological trend accelerating the spread of renewable energy storage facilities across Europe. Integrating batteries into existing solar farms helps solve the intermittency issues of renewable energy and enhances grid stability.