Transmission and Distribution
Transmission pipelines transport large volumes of natural gas under high pressure, from production fields to distribution networks or to large customers, along the pipeline.
Transmission systems generally operate at pressures above 2,000 kPa. There are over 2,500 km of high-pressure gas transmission pipelines in New Zealand. The major ones are:
- Vector’s 2,211km system, which extends to most major North Island centres; and
- the 308km Maui pipeline, extending from South Taranaki north to Huntly, owned by Maui Development Limited.
The 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 more than 17,300 km of intermediate, medium, and low-pressure gas distribution pipeline networks in the North Island connected to the high-pressure transmission system.
There are four gas distributors: GasNet, Powerco, Nova Gas, and Vector.