Engie reuses electric vehicle batteries for energy storage project

French multinational electric utility Engie has deployed an energy storage system in Holland that is powered entirely by second-life batteries from Renault electric vehicles.

The 150 kW/90 kWh E-STOR system in Rotterdam has been developed by UK energy storage technology developer Connected Energy and has been installed on a section of the TenneT distribution network.

The Rotterdam project is the first part of a three-stage project by Engie and Connected Energy. This first step is a seen as “Ëœproof of concept’, designed to demonstrate the technical and economic viability of using E-STOR second-life battery systems for frequency response services.

Engie says the results so far “are extremely positive: E-STOR has been proven to integrate seamlessly into Engie’s flexibility pool of industrial assets and has already generated its grid balancing revenues”.

In a wider context, the project is part of the Re-Use Re-Power initiative developed by Engie. Phase 2 and Phase 3 will see Engie and Connected Energy deploy much larger E-STOR systems at other sites in Northern Europe for grid balancing services.

The deployment at Rotterdam is also significant at a technical level: the E-STOR utilises a new system architecture which enables second-life electric vehicle batteries to be operated in series, which the company says thereby increases power and capacity while reducing cost.

A control room has also been built where the operations of the system can be demonstrated.

Connected Energy chief executive Matthew Lumsden said: “We are delighted with the positive results and feedback from the first stage of this exciting journey with Engie. Our second-life E-STOR battery containers have been proven to deliver on a technical and economic level: they should provide a guaranteed 10-year service in the frequency market with a substantial cost benefit versus new batteries.

“This is just the start of sequence of much bigger system roll-outs – 2019 is looking extremely promising indeed.”

Marcel Didden, project manager of the Re-use and Re-Power project, said: “Using second life car batteries is known to have technology challenges due to the different ageing history of the batteries. As this Rotterdam unit has been approved by the Dutch TSO to provide frequency reserve, Connected Energy has proven to manage these complexities.”


Energy storage breakthroughs and integration challenges will be the focus of numerous sessions at POWER-GEN International. Those include Knowledge Hub sessions on the exhibit floor and a track with sessions upstairs on the third floor of the Orange County Convention Center. POWER-GEN International is December 4-6 in Orlando. Click here for more information and to register. 

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