The Transmission Network Code includes the set of technical and commercial rules of using the Gas Transmission System which govern the relation between the Transmission System Operator “TSO” and the users “Shippers” to guarantee the efficient operation of the Network and its ancillary facilities as well as ensuring efficient and non-discriminatory access to the transmission system. It describes the roles and responsibilities of the players involved (the TSO and the shippers), how and when they shall exchange information.

The Transmission Network Code shall be prepared by the TSO and approved by GasReg.