This paper presents an optimization tool that CRIGEN developed for GRTgaz - the main French transmission system operator (TSO). This tool helps GRTgaz determine how much capacities they can commercialize during a given period of time. This paper has four main parties. In the first one, we will give an overview of GRTgaz contractual and physical network and show how complex it is to calculate reliable transmission capacities. Then we specify the problem of scenario feasibility-checking with a focus on interconnection stations. Last but not least, we present how to calculate the capacities of a network and show a use case of the optimization tool being developed.

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