  There is a growing interest in the use of largescale battery storage systems
for grid services. This technology has been deployed in several countries to
increase transmission systems capabilities and reliability. In particular,
large-scale battery storage systems could be used for congestion management and
the French Transmission System Operator (RTE) is currently installing 3 large
batteries for 2020 at the sub-transmission grid level for this purpose. The
battery operation for congestion management does not require the full storage
capacities at all times. Thus, the residual capacities can be offered to other
services to increase batteries profitability. This paper presents the framework
which will be used by RTE for battery operation scheduling to combine
congestion management with other services by computing day-ahead bandwidths
defining available storage capacities. The bandwidths represent safe domains
for grid operation scheduling: as long as the battery operation is performed
within these bandwidths, there will be no grid congestion or grid congestions
will be managed.
