Orion New Zealand

Orion New Zealand Limited is an electricity distribution company headquartered in Christchurch, New Zealand. It owns and operates the local electricity lines network serving Christchurch and the Selwyn District, rather than functioning primarily as an electricity retailer or a nationwide generation company. Its service territory extends between the Waimakariri and Rakaia Rivers and from the Southern Alps to the Pacific Ocean. The company delivers approximately 3,165 gigawatt-hours of electricity annually to about 190,000 customers through a network containing more than 11,000 kilometres of lines and cables, 52 zone substations, more than 10,000 distribution substations, and over 10,000 transformers. The business emerged from the restructuring of Christchurch-area electricity services. Before 1989, distribution and retailing in the area were handled by four organisations: the Christchurch City Council Municipal Electricity Department, Riccarton Electricity, the Port Hills Energy Authority, and the Central Canterbury Electric Power Board. In 1989, these organisations combined in a joint venture called Southpower. Electricity-sector reforms enacted in 1998 required electricity distribution and retail activities to be separated. Southpower retained the network business and sold its retail operation to Meridian Energy. The distribution company adopted the name Orion New Zealand in December 1998. Orion's core role is to receive electricity from Transpower grid exit points and distribute it through high-voltage and lower-voltage networks to homes, businesses, public facilities, and other electricity users. Its network includes seven principal grid connection points: Bromley, Islington, Kimberley, Hororata, Coleridge, Castle Hill, and Arthur's Pass. The urban Christchurch system is primarily based on 66-kilovolt subtransmission and 11-kilovolt distribution, while parts of western Christchurch, Banks Peninsula, and Selwyn use combinations of 66-kilovolt and 33-kilovolt subtransmission with 11-kilovolt distribution. Customers receive electricity at New Zealand's standard low-voltage configuration of 230/400 volts. The 2011 Christchurch earthquake was a major test of Orion's infrastructure. Liquefaction severely damaged the New Brighton zone substation and destroyed duplicate 66-kilovolt cable connections between Dallington, New Brighton, and the Bromley grid exit point. Orion responded with temporary equipment and supply arrangements, including a replacement transformer, temporary overhead lines, and four 1-megawatt diesel generators at Queen Elizabeth II Park. It subsequently developed permanent infrastructure, including a replacement zone substation at Rawhiti Domain and new underground cable routes. These works were designed both to restore resilience after the earthquake and to accommodate population growth and post-earthquake redevelopment in Christchurch and the Rolleston-Lincoln area. The company has also expanded and reinforced the network in response to demand growth in northern Christchurch. A new zone substation at Waimakariri Road in Harewood was connected to the Papanui substation by a 66-kilovolt cable, relieving pressure on the northwestern network. Further planned links involving Waimakariri Road, Rawhiti, Marshland, and Belfast were intended to improve supply redundancy and enable the eventual removal or relocation of temporary generation assets. Orion also owns Connetics Limited, an electrical contracting business. Its ownership by Christchurch and Selwyn local authorities means that the company operates as a locally accountable infrastructure enterprise, with returns ultimately connected to its council shareholders.

Orion New Zealand's origins lie in the reorganisation of electricity services in Christchurch and surrounding Canterbury districts. Before 1989, four separate bodies were responsible for electricity distribution and retailing in the area: the Christchurch City Council Municipal Electricity Department, Riccarton Electricity, the Port Hills Energy Authority, and the Central Canterbury Electric Power Board. In 1989, these organisations entered a joint venture known as Southpower, creating a more integrated regional electricity business. A significant structural change followed the electricity-sector reforms of the 1990s. The reforms required electricity distribution companies to separate their lines businesses from electricity retailing. Southpower retained ownership and operation of the distribution network, while its retail business was sold to Meridian Energy. In December 1998, the retained lines business was renamed Orion New Zealand Limited. The company has since operated as a network utility rather than as a conventional electricity retailer. Orion's territory covers Christchurch and the Selwyn District. It is bounded by the Waimakariri and Rakaia Rivers to the north and south, and by the Southern Alps and Pacific Ocean to the west and east. The network connects with Transpower at seven grid exit points and distributes electricity through a combination of subtransmission and local distribution infrastructure. Most of Christchurch is supplied through 66-kilovolt subtransmission and 11-kilovolt distribution systems. Other areas, including portions of western Christchurch, Banks Peninsula, and Selwyn, use a mixture of 66-kilovolt and 33-kilovolt subtransmission arrangements. The 2011 Christchurch earthquake became the most consequential infrastructure event in the company's modern history. Liquefaction damaged the New Brighton zone substation and destroyed duplicated 66-kilovolt cables connecting eastern Christchurch facilities to the Bromley grid exit point. Orion implemented emergency measures to restore service and maintain system security, including a temporary transformer, single overhead 66-kilovolt lines, and four 1-megawatt diesel generators at Queen Elizabeth II Park. The company then replaced temporary arrangements with permanent assets, including a new zone substation at Rawhiti Domain and replacement underground cables completed in 2015. Network development continued as Christchurch was rebuilt and new residential growth increased demand in northern Christchurch and the Rolleston-Lincoln area of Selwyn. Orion constructed a zone substation at Waimakariri Road in Harewood and connected it to Papanui by a 66-kilovolt cable. Further planned reinforcement involving Marshland, Waimakariri Road, Rawhiti, and Belfast was intended to create additional supply paths, improve resilience, and allow temporary generation equipment to be removed or redeployed. The company is owned by Christchurch City Council and Selwyn District Council, with the former holding 89.3 percent and the latter 10.7 percent. Orion also has a subsidiary, Connetics Limited, which operates in electrical contracting. Its principal public role is the long-term operation, maintenance, renewal, and expansion of a regional electricity network serving approximately 190,000 customers.

• 2015

  Permanent eastern Christchurch cable replacements completed

  [1]Orion New Zealanden.wikipedia.org

  New 66-kilovolt cables between Bromley, Dallington, and Rawhiti replaced temporary overhead connections and improved the resilience of eastern Christchurch supply.

• 2011

  Christchurch earthquake damages the network

  [1]Orion New Zealanden.wikipedia.org

  The earthquake and liquefaction damaged eastern Christchurch substations and cable routes, requiring temporary supply arrangements and a programme of permanent reconstruction.

• 1998

  Distribution and retail businesses separated

  [1]Orion New Zealanden.wikipedia.org

  Electricity-sector reforms required Southpower to separate its network distribution operation from retailing. The retail business was sold to Meridian Energy, while the lines business remained with Southpower.

• 1998

  Orion New Zealand name adopted

  [1]Orion New Zealanden.wikipedia.org

  The retained Southpower distribution business was renamed Orion New Zealand in December 1998.

• 1989

  Southpower joint venture formed

  [1]Orion New Zealanden.wikipedia.org

  Four Christchurch and Canterbury electricity organisations combined in a joint venture called Southpower, bringing their electricity activities into a more integrated regional structure.

A locally owned electricity distribution network operator focused on safe, reliable, resilient, and capacity-ready power delivery across Christchurch and the Selwyn District.

• Electricity distribution · 1998

  Electricity distribution network

  Orion operates the regional lines network that transports electricity from Transpower grid exit points to customers across Christchurch and the Selwyn District. The system includes more than 11,000 kilometres of lines and cables, 52 zone substations, 10,972 distribution substations, and 10,828 transformers. It uses 66-kilovolt and 33-kilovolt subtransmission in different parts of the region and generally 11-kilovolt distribution within local networks.

• Utility infrastructure service · 1998

  Network connections and capacity services

  The distribution business provides the infrastructure and connection capability needed to supply homes, commercial premises, industrial users, and new developments in its territory. Network reinforcement has been particularly important in post-earthquake Christchurch and in fast-growing areas such as northern Christchurch and the Rolleston-Lincoln corridor.

• Electrical contracting

  Electrical contracting

  Connetics Limited, an Orion subsidiary, operates as an electrical contracting business. It complements Orion's network-ownership role by providing electrical infrastructure and contracting capabilities.

• 2015

  Replace temporary earthquake supply linksGeneration change

  Background

  Temporary overhead lines had been used after the earthquake because the original underground cables between Bromley, Dallington, and New Brighton could not be repaired.

  Action taken

  Orion completed replacement 66-kilovolt cable connections to Dallington and Rawhiti and added a further cable from Dallington to McFaddens Road.

  Aftermath

  The temporary overhead lines could be removed, while Dallington gained an additional supply route and the eastern Christchurch network received greater resilience.

  Source

• 2011

  Implement emergency earthquake network arrangementsOther

  Background

  The Christchurch earthquake and liquefaction made the New Brighton zone substation and duplicated 66-kilovolt cable links unusable.

  Action taken

  Orion installed a temporary transformer, constructed single overhead 66-kilovolt lines, and deployed four 1-megawatt diesel generators at Queen Elizabeth II Park to support supply to northeastern Christchurch.

  Aftermath

  The temporary arrangements supported service restoration while Orion built permanent replacement infrastructure, including the Rawhiti zone substation and new cable routes.

  Source

• 1998

  Retain the distribution business after sector separationStrategy

  Background

  Electricity-sector reforms required the separation of electricity retailing from network distribution.

  Action taken

  Southpower retained its lines business, sold its retail operation to Meridian Energy, and renamed the distribution company Orion New Zealand in December 1998.

  Aftermath

  Orion became a dedicated regional electricity distribution company rather than an integrated retail-and-network electricity business.

  Source

• Reinforce northern Christchurch capacityStrategy

  Background

  Demand increased in northern Christchurch as new development and post-earthquake growth placed additional pressure on the existing network.

  Action taken

  Orion constructed a zone substation at Waimakariri Road in Harewood and connected it to the Papanui substation with a 66-kilovolt cable. Further links involving Marshland, Rawhiti, and Belfast were planned to create additional supply paths.

  Aftermath

  The programme was intended to offload northern areas from Papanui, improve security of supply, and permit temporary generation assets to be removed or relocated.

  Source

1. 1Orion New Zealanden.wikipedia.org
2. 2Orion Group official websiteoriongroup.co.nz