Former Orion Building in Christchurch (since demolished)
Orion is responsible for electricity distribution in Christchurch and the Selwyn District, bounded to the north and south by the Waimakariri and Rakaia Rivers and to the east and west by the Southern Alps and the Pacific Ocean respectively. Within this region, it delivers 3,165 gigawatt-hours of electricity per year to 190,000 customers.
The Orion network consists of over 15,000 kilometres (9,300 mi) of lines and cables, 52 zone substations, 10,972 distribution substations and 10,828 transformers. Orion takes power from nine Transpower grid exit points (from east to west): Bromley, Addington, Middleton, Islington, Kimberley, Hororata, Coleridge, Castle Hill and Arthur's Pass. The majority of Christchurch is served by a 66 kV subtransmission network and a 11 kV distribution network. Some western parts of Christchurch, Banks Peninsula and the Selwyn district is served by a mixture of 66 kV and 33 kV subtransmission and 11 kV distribution. As is standard in New Zealand, electricity is delivered to homes at 230/400 volts (phase-to-neutral/phase-to-phase).