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In July 2014 the NZ Transport Agency signed a Public Private Partnership (PPP) contract with the Wellington Gateway Partnership (WGP), a private group of financiers and contractors, to design, construct, finance, and then operate and maintain the new motorway for the 25 years following the construction period.

Public Private PartnershipPublic Private Partnership

Transmission Gully is the first motorway in New Zealand to be constructed on behalf of the New Zealand Government under a Public Private Partnership (PPP) contract..

A PPP is a long-term contract between the public and private sectors covering the financing, construction and operation of public infrastructure and services. The motorway will remain a public asset – it is never owned by the PPP.

PPPs allow large and complex projects to benefit from private sector innovation and funding which can increase certainty of delivery and drive better value-for-money. There are also savings to be had on all aspects of the project – design, build, maintenance and operational management.

PPPs are typically used for large-scale infrastructure projects where risks can be effectively identified and transferred to the private sector. The NZ Transport Agency aims to use successful ideas and innovations that come out of the Transmission Gully motorway PPP across other motorway projects and the wider transport network.

Learn more about the development of the Transmission Gully motorway PPP.

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Wellington Gateway PartnershipWellington Gateway Partnership logo

The contract to build the Transmission Gully motorway was awarded to Wellington Gateway Partnership (WGP), a private group of financiers and contractors who will design, construct, finance, and then operate and maintain the new motorway for the 25 years following the construction period.

Pacific Partnerships logoPacific Partnerships Pty Ltd(external link)

Pacific Partnerships is CIMIC Group's project finance arm. Pacific Partnerships develops and invests in infrastructure projects built by CIMIC's operating companies and is a long-term partner to clients, providing operation and maintenance services throughout the life of the asset. Pacific Partnerships invests in PPPs and Build Operate Transfer projects.

Combining the PPP capabilities of CIMIC’s operating companies into a single entity formed Pacific Partnerships. The Pacific Partnerships team of experienced professionals has industry-leading knowledge of PPP delivery in Australia, New Zealand and globally.

ACC logoAccident Compensation Corporation (ACC)(external link)

ACC provides comprehensive, no fault personal injury cover for all New Zealanders and visitors. In providing this role ACC maintains one of NZ’s largest investment funds in order to cover the full future costs of all accepted claims.

ACC is an equity and debt partner in the Wellington Gateway Partnership (WGP). Its interests are fully aligned with WGP’s in ensuring that the new motorway will be built on time and to the highest quality and standard of safety.

InfraRed logoInfraRed Capital Partner Ltd (InfraRed)(external link)

InfraRed Capital Partners Limited is a leading global investment manager focused on infrastructure and real estate, creating real value for its investors, project partners, communities and end users.

It manages US$7 billion of equity capital in specialist funds that invest into infrastructure and real estate assets, which InfraRed develops and operates across the globe. It has invested in over 50 development projects, with capital expenditure of c. US$25bn. Its 100 staff are located across offices in London, Hong Kong, New York, Paris and Sydney.


WGP has contracted a joint venture of CPB Contractors and HEB Construction (CPB HEB JV) to undertake the motorway design and construction.

WGP has contracted Ventia to operate and maintain the new motorway for the 25 years following construction.

Design and Construction

CPB HEB Joint Venture logoCPB HEB Joint Venture (CPB HEB JV)

CPB is CIMIC Group's construction company. It has a strong presence in New Zealand having previously worked with the NZ Transport Agency to successfully deliver major projects including the SH20-1 Manukau Extension (2010), the Newmarket Viaduct Replacement (2012) and the current SH16 Causeway Upgrade, which is scheduled for completion in 2017.

HEB Construction brings a range of essential services to the Transmission Gully project such as structures, roading, drainage, landscaping, temporary traffic management, surfacing and precast concrete element capability.

HEB’s recent roading projects include Wellington’s Memorial Park Alliance, the Waikato Expressway – Cambridge Section, Tauranga Eastern Link JV, and Auckland’s Greville Road Interchange.

Operation and Maintenance

Ventia logoVentia(external link)

Ventia is one of the largest dedicated infrastructure service providers in Australasia. Their purpose is to make infrastructure work for communities. With a strong focus on excellence in service delivery, Ventia adds value for their clients through low cost, quality solutions, and uses technology to deliver new and innovative ways of working.

Ventia will be responsible for the Operation and Maintenance of the Transmission Gully motorway for the 25 years following its opening in 2020. Experts in the area of long-term operation, maintenance and management of roading assets and infrastructure, they are committed to delivering a solution for the new motorway that makes the surrounding communities stronger, safer and more sustainable.

Working with iwi

Kaitiaki (Guardians) for the project are Ngāti Toa Rangatira. We’re working closely with them on a range of areas covered by construction of the Transmission Gully motorway. This includes providing cultural advice, environmental monitoring, and archaeological monitoring. Protection and enhancement of Te Awarua o Porirua (Porirua Harbour) is of high importance to the iwi and the project team.

We have Memorandums of Understanding with both Ngāti Toa Rangatira and the Porirua City Council to promote and support education, training, employment opportunities and kaitiakitanga.

At the northern end of the project we work closely with Te Ati Awa ki Whakarongotai.

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