Transmission and Distribution
New Zealand's gas transmission network is owned solely by First Gas Limited.
Transmission pipelines systems transport large volumes of natural gas under high pressure, from production fields to distribution networks or to large customers, along the pipeline.
The gas transmission network includes:
- The 309km Maui pipeline (mostly 750mm diameter), extending from Oaonui Production Station (south of New Plymouth) to the Huntly Power Station (south of Auckland) in the North Island.
- The 2,196km First Gas transmission pipeline (mostly from 155mm to 220mm diameter), generally radiating from the Maui pipeline and delivering gas throughout the North Island.
These two major transmission pipelines operate on open access arrangements allowing all parties to ship gas through their pipelines.
Distribution networks transport gas from gate stations (transmission pipeline delivery points) and reticulate it into residential houses, offices, hospitals, factories, businesses and community amenities.
There are almost 18,000 km of intermediate, medium, and low-pressure gas distribution pipeline networks in the North Island connected to the high-pressure transmission system.
There are five gas distribution companies in New Zealand. Four own and operate open access networks:
- Vector, which has consolidated its gas networks ownership in the greater Auckland area.
- First Gas, which entered the gas distribution market on 20 April 2016 after the purchase of Vector’s non-Auckland gas networks. It owns gas networks in Norhtland, Waikato, Bay of Plenty, Gisborne and Kapiti.
- Powerco, which owns and operates five networks in the lower half of the North Island.
- GasNet a subsidiary of Wanganui Gas, which covers the Wanganui and Rangitikei regions.
The fifth distributor Nova Energy, part of the Todd Corporation, owns smaller networks that bypass existing networks.