The Vector Transmission Code (VTC) sets out the multilateral terms of access to Vector’s transmission pipelines. Although not a party to the VTC, Gas Industry Co originally had a role in considering VTC Change Request appeals. However, a change to the VTC amendment process was introduced on 1 April 2015 (having obtained the necessary support from Vector and its shippers), which reshaped the amendment process, including removing the right of appeal to Gas Industry Co.

Under the re-designed process, notice of a proposed change to the VTC is first published in outline form on the Open Access Transmission Information System (OATIS).  A consultation process then occurs, before Vector shippers vote on the proposal.  Gas Industry Co and other non-VTC stakeholders have an option to provide input during the consultation process