Iberdrola has begun operating the first two large-scale batteries in Spain, installed in the municipality of Alarcón, in the province of Cuenca. The system totals almost 30 MW of power and 60 MWh of storage capacity, marking a significant advance in the integration of renewable sources into the Spanish electricity system.
The storage units are part of a hybrid project associated with the Romeral and Olmedilla photovoltaic plants, each with 50 MW of installed capacity. In each plant, the BESS (Battery Energy Storage System) consists of six 4,5 MW converters, an additional 2,25 MW converter, and 13 battery modules, with 4,66 MWh per module.
According to the company, hybrid power plants share the same grid connection point and use common infrastructure, such as substations and transmission lines. This arrangement allows for the joint use of access and operational facilities, significantly reducing the environmental impact compared to the deployment of independent plants.
“Battery storage technology is an innovative technology that maximizes the use of clean energy by regulating grid frequency in milliseconds and providing backup power during peak consumption periods. Furthermore, it contributes to improving the quality of electricity supply, ensuring grid stability and reliability, and integrating and utilizing energy generated from renewable sources,” the company stated in a press release.
The Romeral and Olmedilla systems are part of a portfolio of six BESS projects, totaling 173 MW of installed capacity. These initiatives have been recognized by IDAE (Institute for Energy Diversification and Savings) as Strategic Projects for Economic Recovery and Transformation, with €37,5 million in funding.
In Iberdrola's strategy in Spain, energy storage is treated as a central driver for electrification, decarbonization, and the energy transition, combining large-scale solutions, such as reversible hydroelectric plants, with smaller BESS systems distributed throughout the territory.
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