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  • Transmission and distribution pipelines. There are more than 3,500 km of high pressure gas transmission pipelines in New Zealand, that radiate from Taranaki to Wellington in the south and north to Huntly, Auckland and Whangarei. A further 2,800 km of intermediate, medium and low pressure gas distribution pipeline networks in North Island are connected to the high pressure transmission systems and branch to Gisborne and Hastings. The largest pipeline, to Huntly, supplies the E3P 385 MW and 50 MW gas turbine. The Motonui Methanex plant near New Plymouth is also a major user of gas.