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Transpower New Zealand Limited (TPNZ) is the state-owned enterprise responsible for electric power transmission in New Zealand. It performs two major functions in the New Zealand electricity market. As the owner of the National Grid it provides the infrastructure of electric power transmission that allows consumers to have access to generation from a wide range of sources, and enables competition in the wholesale electricity market; as System Operator it manages the real-time operation of the grid and the physical operation of the electricity market. Transpower was formed as a wholly owned subsidiary of the Electricity Corporation of New Zealand (ECNZ) in 1987. In 1994 it was separated from ECNZ and corporatised to become a state-owned enterprise with its own board of directors and Ministerial shareholders, the Minister of Finance and the Minister of State-Owned Enterprises. The New Zealand Treasury's Commercial Operations group (formerly the Crown Ownership Monitoring Unit) monitors the performance of Transpower on behalf of the shareholding Ministers.〔(【引用サイトリンク】title= Transpower New Zealand Ltd )〕 ==Role of the National Grid== (詳細はnational grid provides the means of transporting bulk electricity from where it is generated (by companies like Meridian Energy and Mighty River Power) to cities, towns and some major industrial users like the aluminium smelter at Tiwai Point. Most of the electricity from the national grid is delivered to New Zealand’s homes and businesses by electricity distribution companies like Vector and Orion. A few large industrial users are directly connected to the national grid.〔(【引用サイトリンク】title= What we do )〕 Transpower owns and operates of transmission lines. A core network consisting of 5719 km (route) of 220 kV transmission lines exist in each island (one line is built to 400 kV but operates at 220 kV), and this is supplemented by 4719 km of 110 kV transmission lines and 797 km of 66 kV and 50 kV transmission lines, which interconnect the core grid to smaller load centres and power stations. Transpower also owns and operates the HVDC Inter-Island, a 611 km ±350 kV high voltage direct current link between the two islands. There are 178 electrical substations, containing 1116 transformers with a total capacity of 14,500 MVA.〔(【引用サイトリンク】title=Asset Management Plan 2010 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Transpower New Zealand」の詳細全文を読む スポンサード リンク
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