Solar Surplus Optimization at Extremadura I-II-III Photovoltaic Plant for ACCIONA Energy

The Challenge

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The Extremadura I-II-III photovoltaic plant, operated by ACCIONA Energy, is a renewable generation facility with a total capacity of 125 MWp, designed to provide clean energy to a wide range of customers. Committed to leading the energy transition, ACCIONA Energy was looking for a solution that would not only optimize the use of the solar surplus generated, but would also reduce its dependence on fossil sources.

The main challenge was to implement an energy storage system (BESS) capable of:

• Capturing and storing excess solar energy, avoiding losses.
• Releasing energy based on demand, ensuring grid stability.
• Promoting the circular economy, reusing second-life batteries for stationary storage.
• Comparing the performance of recycled and new batteries, generating key information for future projects.

The solution

We designed and implemented two custom solutions based on our containerized BCube®systems, optimized to adapt to ACCIONA Energía's needs:

1. BCube container equipped with 450 batteries from Silence electric motorcycles, specifically adapted by our team for this project.
2. BCube container with new batteries from electric vehicles, ensuring optimal and stable performance.

Both systems offer a combined capacity of 2 MW / 5MWh, allowing for:

• Capture and store surplus solar energy in real time.
• Release energy based on demand or grid disturbances.
• Leverage existing resources, promoting the circular economy.