Circular economy and storage solutions

ACCIONA has grid connected the first renewable storage plant with recycled batteries in Spain in its experimental photovoltaic plant in Tudela (region of Navarra).

The set of second-hand batteries, with a total capacity of 130kWh, stores the energy obtained from the 1.2-MWp plant to inject it in the grid and analyse its performance and behaviour.


The innovation project is rounded off by a comparative analysis to check the capacity of the recycled batteries to see if they can offer the same performance as new batteries.

General information

  • Location: Battery test bench in the Montes del Cierzo PV plant in Navarra
  • Duration: August 2018-September 2021
  • Participants: Acciona. Partner: BeePlanet
  • Budget: €292,075
  • Project funded by the Government of Navarra in its strategic projects programme for 2018-2020

Content and activities

  • Procedures to characterise and classify second-hand EV batteries.
  • Analysis of the state of health of the battery and age model. Design of test methodology aimed at industrial application.
  • Design of an advanced Battery Management System (BMS) specifically for the monitoring and management of a range of second-hand batteries.
  • Integration of second-hand batteries into the Test Bench for Storage Trials in the experimental photovoltaic plant in Tudela.
  • Experimentation, tests, trials and validation of Advanced Operational Strategies for Storage Systems.

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