Electrical Substation and HVDC Converter Plant
The Haywards electrical substation is one of national grid operator Transpower's largest substations and is a key part of New Zealand's national electricity network. The North Island converter station for the HVDC Inter-Island is co-sited with the main HVAC substation, and converts the ±350 kV direct current electricity transmitted from the South Island converter station at Benmore to 220 kV alternating current for the North Island, and vice versa.
220 kV to 110 kV interconnecting transformers at Haywards supply the regional 110 kV network that serves much of the Wellington Region. Supply transformers at Haywards step down voltage to 33 kV and 11 kV and provide a connection to the Wellington Electricity subtransmission and distribution network serving the central-north Hutt Valley, from Trentham in the north to Taita in the south. 220 kV lines connect Haywards to the Wilton substation to supply central Wellington City, and north to Bunnythorpe near Palmerston North to connect with the rest of the North Island grid.
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