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In 1969 construction was completed on a pipeline from the Kapuni treatment plant to Auckland and Wellington. A gas treatment plant was commissioned in 1970 and bulk gas transmission began. This pipeline has since been extended to Gisborne and Hastings in the east, and Kauri in the far north.

A second pipeline was also constructed to carry Maui gas from Oaonui on the Taranaki coast to Huntly and Auckland.

Today Vector operates and manages over 2,300 km of high-pressure gas transmission pipeline including the Maui Development Ltd pipeline.