Orion New Zealand

Prior to 1989, electricity distribution and retailing in Christchurch and Selwyn was the responsibility of four entities: the Christchurch City Council Municipal Electricity Department (MED), Riccarton Electricity, the Port Hills Energy Authority, and the Central Canterbury Electric Power Board. In 1989, all four companies entered a joint venture, named Southpower. The 1998 electricity sector reforms required all electricity companies to separate their distribution and retailing businesses. Southpower retained its distribution business and sold its retail business to Meridian Energy. In December 1998, the lines business was renamed Orion New Zealand. ==Electricity network==

The Orion network consists of over of lines and cables, 52 zone substations, 10,972 distribution substations and 10,828 transformers. Orion takes power from seven Transpower grid exit points (from east to west): Bromley, Islington, Kimberley, Hororata, Coleridge, Castle Hill and Arthur's Pass. The majority of Christchurch is served by a 66 kV subtransmission network and an 11 kV distribution network. Some western parts of Christchurch, Banks Peninsula and the Selwyn district are 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). Network development Orion's distribution network suffered significant damage following the 2011 Christchurch earthquake, especially in the eastern suburbs of Christchurch. In addition, new post-earthquake developments in the northern and southwestern suburbs of Christchurch and the Rolleston-Lincoln area of the Selwyn district are increasing demand on the network in those areas. The liquefaction from the 2011 earthquake damaged the New Brighton zone substation and the duplicated 66 kV cables linking Dallington and New Brighton zone substations with the Bromley GXP beyond repair. As a temporary solution to get power into the northeastern suburbs, a transformer was brought in to replace New Brighton zone substation and single 66 kV overhead lines were constructed to link the New Brighton transformer and Dallington zone substation to Bromley. To backup the single line supplies, four 1 MW diesel generators were installed at Queen Elizabeth II Park. A new zone substation was built in the Rawhiti Domain to replace New Brighton zone substation, with the temporary overhead line extended to reach it. Replacement single 66 kV cables from Bromley to Dallington and Rawhiti were completed in 2015, allowing the temporary overhead lines to be removed. A new single 66 kV cable was also constructed from Dallington to the McFaddens Road zone substation in Saint Albans to provide a second supply route for Dallington. With the increasing demand in the northern suburbs, a new zone substation was constructed at Waimakariri Road in Harewood, connected to Papanui (Greers Road) zone substation by a single 66 kV cable. This offloaded the northwestern suburbs of Christchurch from Papanui. To secure a second supply to both Waimakariri and Rawhiti zone substations, a new single 66 kV cable will be constructed to link them via Marshland. This will allow the QEII Park generators to be removed and reinstalled in the Belfast area to secure supply in the northern suburbs. Eventually, a new zone substation at Marshland will be built to offload some northern suburbs from Papanui. This excludes the 22kv transmission lines around Coutts Island and Kainga areas which are supplied by MainPower. ==Subsidiaries==

• Connetics Limited, electrical contracting business == See also ==