A probabilistic congestion signal for optimal management of battery storage systems

Battery energy storage systems are now essential for electricity system security, already contributing around 40% of Frequency Containment Reserves (FCR) in France. They are expected to play a growing role in Frequency Restoration Reserves (FRR) and in inertia loss compensation as the share of synchronous machines in the system declines. To accelerate their integration while limiting costs, RTE - the French transmission system operator - has adopted an optimal grid sizing strategy, allowing battery connections on existing infrastructure, but with occasional injection or withdrawal limits. To support this, RTE plans to issue a local congestion signal before the D-1 System Services Tender, warning operators of potential restrictions so they can optimize market strategies and help prevent…