Vector Limited#Electricity distribution

The Auckland Electric Power Board (AEPB) was formed in 1922, taking over the generation, distribution and supply of electricity from several local councils. All electricity was generated locally until 1925 when the transmission line from Horahora Power Station to Penrose substation was commissioned. The AEPB was connected to the newly completed Arapuni Power Station in 1929.

Under the government reforms introduced by the Energy Companies Act 1992, the Auckland Electric Power Board was corporatised and became Mercury Energy Limited, a company owned by the Auckland Energy Consumer Trust (AECT).

The AECT was established, along with 29 other energy trusts throughout the country, to ensure that the power lines remained in the control of electricity consumers.

The AECT retained 100% ownership of Vector until 2005, when they agreed to Vector's initial public offering, or share float, of 24.9% of the shares in Vector, so it could raise money to buy gas company NGC Holdings - Vector has since gone on to invest in other businesses too. The result of this share float, and a subsequent buy back of shares in 2009, is that the AECT holds 75.4% of Vector's shares, a controlling interest.

The AECT has had guardianship of Vector on behalf of the Auckland community only since 1993. However, the idea of community ownership of Auckland's power network goes back much further than that. The Auckland Electric Power Board was set up in 1922 as a consumer-owned utility. (Before that, electricity distribution was looked after by local councils.) Even back then, the AEPB's founders understood the value and importance of electricity supply to Aucklanders, and this model of guardianship of electricity distribution for the good of the entire community continues today with the AECT.

When incorporated, Mercury Energy Limited owned the distribution business in Auckland, Manukau and Papakura, and also retailed electricity to customers connected to the network and elsewhere. Further government reforms were introduced by the Electricity Industry Reform Act 1998. These reforms prohibited one business from being involved in distribution and generation as well as retail,{{citation needed|date=August 2022}} so the retail business of Mercury Energy Limited was sold to Mighty River Power, a state-owned enterprise. Mighty River continued to use the name as a trading name, and in 2016 changed its company name to Mercury Energy.

Mercury Energy Limited changed its name to Vector Limited and kept its lines business. A flotation on the local stock exchange in 2005 provided funds for further acquisitions and expansion of its fibre optics network

• UnitedNetworks was bought in 2002.{{Cite web |last=Daniels |first=Chris |date=2002-10-04 |title=Vector takes control of UnitedNetworks |url=https://www.nzherald.co.nz/business/companies/energy/vector-takes-control-of-unitednetworks/AZHWWOISUCJEYEXXS24TCEWSRQ/ |url-status=live |archive-url=https://web.archive.org/web/20250401043428/https://www.nzherald.co.nz/business/companies/energy/vector-takes-control-of-unitednetworks/AZHWWOISUCJEYEXXS24TCEWSRQ/ |archive-date=2025-04-01 |access-date=2025-04-01 |website=The New Zealand Herald |language=en-NZ}} It was a lines company operating on Auckland's North Shore and Waitakere which included a telecommunications network and Auckland's gas network. This purchase made Vector the largest multi-utility company in New Zealand.
• NGC Holdings (gas) bought from Australian Gas Light (AGL). Two-thirds in 2004, the balance in 2005. This gas transmission and distribution business was sold in 2016, becoming Firstgas, although Vector retained ownership the Auckland gas distristibution network.{{cite press release |title=Sale of Vector Gas Limited completed |date=20 April 2016 |publisher=Vector Limited |url=http://vector.co.nz/newsdisplay/Market-Release-Sale-of-Vector-Gas-Limited-completed |url-status=dead |archive-url=https://web.archive.org/web/20160624154316/http://vector.co.nz/newsdisplay/Market-Release-Sale-of-Vector-Gas-Limited-completed |archive-date=24 June 2016}}
• NZ Windfarms A 19.99% cornerstone shareholding was bought in 2007 and later increased to 22 percent.{{citation needed|date=August 2022}}
• Advanced Metering Services, a joint venture with Siemens (NZ) to provide advanced metering technology and services. Established 2007, the remaining 50 percent was bought from Siemens in 2010.{{citation needed|date=August 2022}}
• Arc Innovations, a subsidiary of Meridian Energy, was acquired in November 2014.{{Cite web |last=MarketScreener |title=Meridian Energy : sells Arc Innovations to Vector {{!}} MarketScreener |url=https://www.marketscreener.com/quote/stock/MERIDIAN-ENERGY-LTD-17067787/news/Meridian-Energy-sells-Arc-Innovations-to-Vector-19471611/ |access-date=2022-09-20 |website=www.marketscreener.com |date=30 November 2014 |language=en}}

Vector sold its Wellington electricity network in 2008 to Cheung Kong Infrastructure Holdings Limited of Hong Kong for $785 million. The network was renamed Wellington Electricity.

In 2006 the New Zealand Institute of Economic Research compared Trust ownership of Vector with four alternatives (local council ownership, management by a professional trust company, handing shares over to beneficiaries, local councils and the Auckland Regional Council, and transfer of shares to a new regional infrastructure body).

On every measure, including efficiency and what was best for energy consumers in the Trust area, the NZIER concluded that the current setup is the best option.

Vector's customers hold 75.1% of its shares through the Auckland Energy Consumer Trust, and 24.9% of its shares are traded on the NZX. An annual dividend of $150–320 is paid to each customer in the Trust area. Two of Vector's directors are trustees of the Auckland Energy Consumer Trust.{{cite web |url= http://www.aect.co.nz/about-us/ |title=About us |publisher=Auckland Energy Consumer Trust |access-date=24 October 2015}} The Trust's close relationship with the Vector board of directors has been under scrutiny by the media and the New Zealand Commerce Commission during the mid-2000s, and some have called for the trust to be disbanded, with Vector shares instead to be handed over directly to the beneficiaries of the trust.{{cite news| title=Switch off energy trust| first=Fran| last=O'Sullivan| url=http://www.nzherald.co.nz/vector/news/article.cfm?o_id=231&objectid=10416689| publisher=The New Zealand Herald | date=24 December 2006| access-date=24 October 2015}} The proposal however gained no general support.{{cite news| url=http://www.stuff.co.nz/sunday-star-times/features/feature-archive/28112/Council-investments-beyond-their-mandate| title=Council investments - beyond their mandate?| date=7 October 2007| first=Jenni| last=McMannus| publisher=The New Zealand Herald | work=Sunday Star Times}}

Vector owns and operates the electricity sub-transmission and distribution networks across the majority of the Auckland Region, from Wellsford in the north to central Papakura in the south, and over the Tamaki Strait to Waiheke Island. The network consists of 19,280 km of lines, fifty-seven percent of which is underground, at voltages of 110 kV, 33 kV, 22 kV,11 kV and 400 V. Electricity is taken from Transpower's national grid at fourteen grid exit points: Wellsford, Silverdale, Albany, Wairau Road, Henderson and Hepburn Road for the northern network, and Mount Roskill, Hobson Street, Penrose, Otahuhu, Pakuranga, Mangere, Wiri, and Takanini for the southern network. Due to differing vector groups, the only distribution level connection between the northern and southern networks is via a phase-shifting transformer between Avondale zone substation (Mount Roskill) and Brickworks zone substation (Hepburn Road). In October 2016, Vector installed a 1MW/2.3MWh lithium-ion battery for grid strengthening near Glen Innes in Auckland. It consists of 24 Powerpacks.{{cite web|url= https://electrek.co/2016/10/25/tesla-powerpack-first-grid-scale-powerpack-installation-asia-pacific/ |title=Tesla delivers 'first grid-scale Powerpack installation in Asia-Pacific', watch cool timelapse video of the installation|date=25 October 2016|work=Electrek|access-date=25 October 2016}}

In the year to 31 March 2022, the Vector distribution network had a normalised System Average Interruption Duration Index (SAIDI) of 40.5 planned minutes plus 92.4 unplanned minutes and a normalised System Average Interruption Frequency Index (SAIFI) of 0.27 for planned outages, and 1.05 for unplanned outages.{{Cite web |title=Vector Price Quality Path Disclosure Statement 2022 |url=https://blob-static.vector.co.nz/blob/vector/media/vector-2022/vector-electricity-distribution-annual-compliance-statement-2022.pdf}}

{{Reflist}}

• King, Jennifer. Sign of Service: A history of the Auckland Electric Power Board. History of the AEPB (and electricity in Auckland in general).

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