Previously the gas transmission market in Northern Ireland had been operated by four separate Transmission System Operators (TSOs), PTL, BGTL, WTL and GNI (UK).
In the interests of streamlining the interaction between gas suppliers and TSOs, the Utility Regulator has sought to create a single system operator to manage all the commercial functions on behalf of the TSOs in Northern Ireland.
The TSOs have now put in place arrangements to establish GMO NI and ensure there is a single interface for dealing with all commercial aspects of operating the transmission networks.
The TSOs are still responsible for operating and maintaining their respective transmission networks.