Transpower New Zealand

Transpower New Zealand Limited, generally known as Transpower, is the state-owned enterprise responsible for New Zealand's national electricity transmission network and for operating the country's wholesale power system in real time. Its infrastructure connects major generating stations with cities, towns, distribution networks and large industrial customers, allowing electricity produced in different parts of the country to be transported to areas of demand. The company is therefore distinct from electricity distribution businesses such as Vector and Orion, which deliver power locally to most homes and businesses, and from electricity generators such as Meridian Energy and Mercury, which produce electricity. Transpower's origins date to 1987, when it was established as an operating division of the Electricity Corporation of New Zealand. In 1994 it was separated from the corporation and corporatised as an independent state-owned enterprise. It operates with its own board and has ministerial shareholders represented by the Minister of Finance and the Minister of State-Owned Enterprises. Performance is monitored for the shareholding ministers by the New Zealand Treasury's commercial-operations function. The company's principal asset is the National Grid. The network includes approximately 11,806 kilometres of transmission lines, with a core system based mainly on 220-kilovolt circuits, supplemented by 110-kilovolt, 66-kilovolt and 50-kilovolt lines serving smaller load centres and connecting power stations. Transpower also owns and operates the high-voltage direct-current link between New Zealand's North and South Islands. The inter-island connection is strategically important because it allows electricity to be transferred between the two islands and supports the operation of a national wholesale electricity market. The network includes 178 substations and more than 1,100 transformers, with total transformer capacity reported at approximately 14,500 MVA. Transpower has two closely related but institutionally distinct functions. As grid owner, it maintains, develops and invests in the physical transmission system and provides regulated transmission services. As system operator, it coordinates the real-time operation of the power system and the physical operation of the electricity market. This includes balancing generation and demand continuously, arranging reserves, dispatching generation and reserve providers, responding to unexpected system events, coordinating outages and supporting the commissioning of new generation and transmission assets. The system operator also undertakes forward planning and security analysis to ensure that supply can meet expected demand and that the system can withstand contingencies. Revenue from transmission services is subject to economic regulation by the Commerce Commission under Part 4 of the Commerce Act. Since 1 April 2011, Transpower's transmission business has operated under an individual price-quality path, which sets the company's allowable revenue for each pricing year and establishes service-quality expectations. Price-quality paths are reset periodically, generally over four- or five-year regulatory periods. The separate system-operator function is provided and funded under an agreement with the Electricity Authority. Transpower's role makes it a central institution in New Zealand's electricity sector. It does not ordinarily sell electricity to end users as a retail brand. Instead, it provides the backbone through which electricity can move between generators, distributors and directly connected industrial users, while maintaining the reliability and security of the national power system.

Transpower was formed in 1987 as an operating division of the Electricity Corporation of New Zealand, at a time when the country's electricity sector was being reorganised and the functions of generation, transmission and system operation were being given clearer institutional form. In its initial form, Transpower was not a separately incorporated state-owned enterprise; it operated within the Electricity Corporation structure while carrying out the transmission-related responsibilities that would later become its defining role. A significant institutional change occurred in 1994, when Transpower was separated from the Electricity Corporation and corporatised as a standalone state-owned enterprise. The change gave it its own board and placed it under the ownership framework used for New Zealand state-owned enterprises. The Crown's shareholding ministers are the Minister of Finance and the Minister of State-Owned Enterprises, while the Treasury monitors the company's performance on their behalf. This structure separates ownership oversight from day-to-day management and allows Transpower to operate the national grid as a commercially governed public enterprise. Transpower's core business is the ownership, maintenance and development of the National Grid. The grid transports bulk electricity from generating stations to distribution companies, cities, towns and major industrial consumers. It also enables electricity generated in one region to serve demand elsewhere, supporting competition among generators and the operation of the wholesale electricity market. Most electricity ultimately reaches households and businesses through local distribution companies, but some large users, including major industrial facilities, are connected directly to the transmission network. The physical system developed and operated by Transpower includes a high-voltage backbone in both islands, lower-voltage connections to regional load centres and power stations, substations, transformers and the HVDC Inter-Island link. The inter-island link provides an electrical connection between the North and South Islands and allows transfers of power across the Cook Strait route. Together, these assets form the infrastructure through which New Zealand's geographically distributed generation and demand are coordinated. Transpower also performs the system-operator function. In that role, it manages the power system continuously rather than simply maintaining physical assets. The system operator must keep supply and demand in balance from second to second, maintain system frequency, arrange reserves and coordinate responses to sudden failures or other contingent events. It determines the combination of generation and reserve providers required for each trading period and issues operating instructions within the framework of the electricity market. The function also includes outage coordination, operational planning, investigations, security analysis and support for the connection and commissioning of new generation and transmission facilities. The regulatory framework for Transpower's transmission activities changed materially with the introduction of individual price-quality-path regulation under Part 4 of the Commerce Act. The framework took effect on 1 April 2011. Under it, the Commerce Commission regulates the revenue Transpower can recover for transmission services and monitors quality outcomes. Revenue paths are set for regulatory periods and periodically reset, while quality requirements address the reliability and performance of the transmission service. The system-operator function is separately provided and funded through an agreement with the Electricity Authority. Through these institutional and regulatory arrangements, Transpower has become the central transmission and system-coordination organisation in New Zealand's electricity sector. Its public-enterprise status, nationwide infrastructure and operational responsibilities distinguish it from generators, retailers and local distribution companies. The company's continuing purpose is to provide and manage the high-voltage network required to move electricity securely and efficiently across the country.

• 2011

  Individual price-quality-path regulation began

  [1]Transpower New Zealanden.wikipedia.org

  From 1 April 2011, Transpower's transmission revenues and service-quality expectations came under individual price-quality-path regulation administered by the Commerce Commission under Part 4 of the Commerce Act.

• 1994

  Separated and corporatised as a state-owned enterprise

  [1]Transpower New Zealanden.wikipedia.org

  Transpower was separated from the Electricity Corporation and became an independent state-owned enterprise with its own board and ministerial shareholders.

• 1987

  Established within the Electricity Corporation of New Zealand

  [1]Transpower New Zealanden.wikipedia.org

  Transpower was initially created as an operating division of the Electricity Corporation of New Zealand to undertake electricity transmission responsibilities.

National electricity transmission infrastructure owner and independent power-system operator

• Electricity transmission network

  National Grid

  Transpower's National Grid is the high-voltage network that carries bulk electricity from generating stations to distribution companies, population centres and large directly connected industrial users. It comprises transmission lines at several voltage levels, substations and transformers. The network supports the movement of electricity between regions and provides the physical platform for competition and trading in New Zealand's wholesale electricity market.

• High-voltage direct-current transmission

  HVDC Inter-Island link

  The HVDC Inter-Island link connects New Zealand's North and South Islands through a high-voltage direct-current transmission system. It enables electricity transfers between the islands and is an important part of national system coordination because generation and demand are distributed geographically. The link is operated as part of Transpower's transmission infrastructure rather than as a retail electricity product.

• Power-system and electricity-market operation

  System operator service

  Transpower's system operator service manages the physical operation of New Zealand's power system in real time. It balances generation and demand, maintains frequency and security, arranges reserves, coordinates responses to contingencies and supports the scheduling and dispatch of generation. It also performs forward operational planning, outage coordination and investigations needed to maintain reliable supply.

1. 1Transpower New Zealanden.wikipedia.org