About Transpower New Zealand and Its Operations

Transpower New Zealand is the country's primary electricity transmission company, responsible for managing the high-voltage grid that connects power stations to homes and businesses.

Transpower's network spans over 11,000 kilometers, making it one of the longest transmission networks in the world.

The company's operations are focused on ensuring a reliable and efficient supply of electricity to meet New Zealand's growing energy needs.

Transpower's network is designed to withstand the country's rugged terrain and harsh weather conditions, with some lines operating at heights of over 100 meters.

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We're Transpower New Zealand, a state-owned enterprise responsible for managing the national grid. We operate as a successful business, earning a commercial return on our assets.

Our main focus is on grid planning and management, ensuring the efficient transmission of electricity across the country. We propose transmission investments to the Commerce Commission and report on our asset management plans.

We have contracts with transmission customers who are directly connected to the grid, such as generators, distributors, and large industrial companies. These customers must have an agreement for the provision of transmission services, as outlined in the Code.

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We work closely with Transpower, the grid owner, to ensure the grid meets reliability and service level requirements. This involves collaborating with them to develop and implement policies that promote efficient day-to-day operation of the wholesale electricity market.

Our team is responsible for approving the transmission pricing methodology (TPM), which ensures Transpower can recover the costs of running the grid from transmission customers. The TPM is outlined in Schedule 12.4 of the Code.

Transpower must demonstrate to the Electricity Authority that transmission prices are audited and consistent with the TPM. This involves providing a directors' compliance statement and an independent assurance report every year.

As part of our role, we also ensure that Transpower develops and publishes transmission prices consistent with the TPM.

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At our company, we prioritize effective management to ensure smooth operations. We have a system in place to manage our grid, which is overseen by Transpower.

Transpower can reconfigure the grid permanently if it results in a net benefit. This means making changes to the grid that will ultimately save us money and resources.

We also have a protocol in place for temporary reconfigurations, which can be done to improve the security of our supply. This is especially important during times of high demand or unexpected outages.

Transpower has the authority to temporarily remove grid assets from service or reduce their capacity. This might seem drastic, but it's a necessary measure to prevent larger issues from arising.

We plan and carry out outages according to a set protocol, which helps minimize disruptions to our operations. This ensures that our customers continue to receive the service they need, even during maintenance or repairs.

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Transpower New Zealand operates under a strict regulatory framework. The Commerce Commission oversees the company's revenue, ensuring it remains fair and transparent.

The Commerce Act's Part IV governs Transpower's revenue, using individual price-quality path (IPP) regulation. This type of regulation was introduced on April 1, 2011, and is reviewed every four to five years.

Quality targets for the transmission service are also monitored and reviewed as part of this process. This ensures that Transpower meets certain standards and provides reliable service to its customers.

The Commerce Commission's regulation has a direct impact on Transpower's pricing year. The Commission sets the revenue paths, which in turn affect the company's bottom line.

Transpower is responsible for building, maintaining and operating New Zealand's National Grid, which is made up of nearly 12,000 km of high-voltage transmission lines and over 170 substations and switchyards. This network is the backbone of the country's electricity system.

The National Grid is a complex system that requires regular upgrades and maintenance to ensure reliable electricity supply. Transpower has been upgrading the grid to increase supply security to central Auckland and Northland, with projects such as the North Island Grid Upgrade and the HVDC upgrade project.

Transpower's transmission network is made up of different voltage levels, including 220 kV, 110 kV, 66 kV, and 50 kV transmission lines. These lines supply electricity to major cities and towns across the country.

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The backbone of New Zealand's national grid is the network of 220 kV transmission lines in each of the North and South Islands, which links the major power stations and the country's major cities.

These 220 kV transmission lines are supplemented by 110 kV, 66 kV and 50 kV transmission lines, which supply provincial towns and cities with electricity from the 220 kV grid, and also connect smaller power stations to the grid.

The 220 kV transmission lines are a crucial part of the national grid, providing a high-voltage connection between the major power stations and the country's major cities.

Here's a breakdown of the different voltage levels in New Zealand's transmission network:

These different voltage levels work together to ensure a reliable and efficient transmission of electricity across New Zealand.

The HVDC Link is a crucial part of New Zealand's transmission network, connecting the North and South Island grids. It's a 535-kilometer-long overhead transmission line that spans across the country, making it one of the longest transmission lines in the world.

The HVDC Link starts at the Benmore Power Station in South Canterbury, where it connects to the South Island 220 kV grid. From there, it travels over 40 kilometers of submarine power cables across the Cook Strait to Oteranga Bay, west of Wellington.

The main reason for this power system connection is due to New Zealand's geography and demographics. The South Island has a large number of rivers suitable for hydroelectricity generation, but 75% of New Zealand's population lives in the North Island.

The HVDC Link was chosen for its practicality and economy, particularly for long-distance transmission where significant lengths of cable are required. This technology allows for efficient and reliable transmission of power across long distances.

Here are some key facts about the HVDC Link:

The "Glide Path" strategy was adopted by Transpower in 1997, expecting widespread installation of distributed generation to reduce the need to expand and renew the grid.

Many of the grid assets were approaching the end of their useful life by 2003, and had to carry higher loads than previously experienced to meet the demands of a growing economy and population.

Transpower identified that the grid backbone was nearing its capacity and that investment was needed in many other parts of the grid.

The transmission lines into and around Auckland were of particular concern, having remained largely unmodified since the late 1970s while the city's population has doubled.

Several high-profile failures, including the 1998 Auckland power crisis and the 2006 Auckland Blackout, highlighted the issues with the aging and near-capacity infrastructure.

A corroded shackle broke in 2006, causing a seven-hour outage of the inner city.

Transpower New Zealand has been actively upgrading its grid infrastructure to meet the growing demands of the country's electricity supply. One notable project was the North Island Grid Upgrade, which involved a 220 kV switching station at Drury, upgrading the existing 220 kV Otahuhu to Whakamaru C line, and the construction of a new 220/400 kV transmission line between Whakamaru and Pakuranga.

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The project, which was approved in September 2009, included new capacitors at Otahuhu, Penrose, and Hepburn Road substations. The upgrade aimed to increase the capacity of the grid and ensure the security of electricity supply to Auckland. A significant aspect of this project was the construction of a new 220/400 kV transmission line between Whakamaru and Pakuranga.

In addition to the North Island Grid Upgrade, Transpower also completed a further grid upgrade project to increase supply security to central Auckland, the North Shore, and further afield to Northland. This project involved building a new 220 kV cross-harbour underground cable link between Pakuranga, Penrose, Hobson Street (Auckland CBD), Wairau Road (North Shore City), and Albany.

Transpower has also invested in upgrading its HVDC (High Voltage Direct Current) system, which was a major project that involved replacing the existing mercury-arc valve converters with new HVDC converter stations at Benmore and Haywards. This upgrade allowed the link to carry up to 1000 MW with future provision for 1400 MW.

Here are some key details about the HVDC upgrade project:

Transpower has also invested in a reliability upgrade in the Lower South Island, which included connecting Gore substation to the existing 220 kV North Makarewa–Three Mile Hill line, installing new 220/110 kV transformers, and installing a series capacitor on one circuit of the North Makarewa–Three Mile Hill line.

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The Wairakei ring is a crucial part of New Zealand's power grid, linking several hydro and geothermal power stations to the national grid.

A new double circuit 220 kV line, Wairakei to Whakamaru C, was built to replace the single circuit Wairakei to Whakamaru B line. This upgrade was intended to facilitate the connection of up to 1000 MW of new generation expected in the region over the next 5-7 years.

The estimated cost of the project was $141 million, and it was completed by Transpower in mid-2013. The project was approved by the Electricity Commission in 2009.

In October 2021, Transpower submitted a resource consent application to the Taupō District Council to build a series reactor on the Wairakei to Whakamaru A line at Ātiamuri. This reactor will re-balance the electricity flow between the A and C lines to allow an extra 500 MW to be transmitted towards Whakamaru.

The North Island Grid Upgrade project, which took place between the southern Waikato region and central Auckland, involved a 220 kV switching station at Drury and a new 220/400 kV transmission line between Whakamaru and Pakuranga.

A further grid upgrade project was completed to increase supply security to central Auckland, the North Shore, and further afield to Northland, involving a new 220 kV cross-harbour underground cable link between Pakuranga, Penrose, Hobson Street, Wairau Road, and Albany.

The HVDC upgrade project, approved in 2008, replaced aging mercury-arc valve converters with new thyristor valve poles, allowing the link to carry up to 1000 MW with future provision for 1400 MW.

The project involved seismic strengthening works for existing and new switchyards, extensions to 220 kV switchyards, and replacement of control systems for the existing Pole 2 converter stations.

A Lower South Island transmission reliability investment proposal was approved in 2010, with a maximum approved cost of $62.4m, and included connecting Gore substation to the existing 220 kV North Makarewa–Three Mile Hill line and installing new 220/110 kV transformers.

The new interconnection at Gore was constructed during 2017-2018.

Here are some key grid upgrade projects:

The HVDC Inter-Island link is New Zealand's only high voltage direct current system, providing a connection between the North and South Island grids, and the main reason for this connection is due to New Zealand's geography and demographics.

Transpower New Zealand's financial situation is quite impressive, with an annual revenue of $704.7 million in 2025.

This significant revenue is a testament to the company's strong performance in the energy sector.

Transpower New Zealand's annual revenue was $704.7 million in 2025.

Transpower New Zealand has a significant workforce to maintain and upgrade the country's power grid. 1,064 people are employed at Transpower New Zealand.

The company's operations are spread across various locations in New Zealand, but unfortunately, I couldn't find any information on the specific locations.

New Zealand has a unique CEO for its power grid, James Kilty, who leads Transpower New Zealand.

James Kilty is the CEO of Transpower New Zealand.

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1,064 people are employed at Transpower New Zealand.

The company has a significant presence in New Zealand, with its headquarters located in Wellington.

In New Zealand, you'll find Transpower based in Wellington, Wellington. That's right, they have a presence in the capital city.

If you're looking for a company to work for in Wellington, you might want to consider Transpower.