Large-scale BESS: meeting France’s ultra-fast frequency and voltage requirements

Grid management is becoming increasingly complex due to the growing share of variable renewable energy in the power mix. In France, electricity grid requirements are particularly demanding, especially for ultra-fast frequency and voltage control.

Coupled with the challenge of real-time control of multiple devices across multiple subsystems, these stringent standards create significant barriers to the deployment of large-scale Battery Energy Storage Systems (BESS).

Fact sheet

  • Year: 2026
  • Tags: BESS, Energy_Storage, Energy_Transition, Innovation
  • Status: Completed

To overcome these technical hurdles, SPIE developed an innovative approach enabling BESS projects to meet the strict French electricity grid code for ultra-fast frequency and voltage regulation. The solution combines several breakthrough elements: leading the development of a closed-loop Power Plant Controller (PPC), applying deep expertise with the flexible use of the IEC 61850 communication protocol across all system equipment, and carrying out simulations and real-model testing in a partner laboratory before commissioning.

For the first time, the system can control more than 80,000 battery cells via 400 inverters, enabling the continuous charging and discharging of 65MW in less than 500 milliseconds. This unprecedented level of performance and responsiveness ensures compliance with France's demanding grid standards while maintaining optimal system reliability.

This innovation demonstrates SPIE's ability to bridge complex technical requirements with operational reality, turning regulatory constraints into deployment opportunities for renewable energy storage infrastructure.

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GHG impact

The system supports the deployment of large-scale BESS projects, helping to improve power grid stability by providing flexibility while balancing electricity supply and demand. It also enables greater integration of renewable energy and reduces environmental impacts like greenhouse gas emissions.

By facilitating the connection of battery storage to the grid, SPIE contributes to reducing customers' greenhouse gas emissions and enhances power grid stability with environmental performance that surpasses standard market solutions.


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80,000 battery

cells controlled via 400 inverters.

65 MW

charging/discharging in less than 500 milliseconds.