Formerly public gas transporter, a company that owns or operates gas pipelines used to transport gas to customers or the system of another gas transporter. A gas transporter must be licensed under the Gas Act 1986 unless an exemption applies. National Gas Transmission (NGT) is the gas transporter for the national transmission system (NTS). Gas transporters can also own and operate gas distribution networks (GDNs) or independent networks (see independent gas transporter (iGT)). For more information, see Practice note, Downstream gas industry: overview.