The Central Interceptor – Auckland’s largest wastewater tunnel

Auckland, Central Interceptor, new zealand,


The Central Interceptor will be Auckland’s largest wastewater tunnel and the biggest wastewater project in New Zealand’s history.

What will it do?

The Central Interceptor will improve the health of the city’s waterways by reducing wet-weather overflows by around 80%. The wastewater and stormwater from overflow points will be collected and transported to Māngere for treatment. Currently, some parts of Auckland have no stormwater system and as a result, stormwater gets into the wastewater pipes and overflows into streams and beaches.

Who will construct the Central Interceptor?

Ghella-Abergeldie Harker Joint Venture has been chosen to construct the tunnel.

Who is Ghella?

Founded in 1894, Ghella is a company involved in the construction of major infrastructure projects worldwide such as subways, railways, motorways, major roads, water and hydraulic works.

It specializes in mechanized excavation and tunnelling and is also involved in the renewable energies sector. In Australia, Ghella completed the Legacy Way tunnel in Brisbane.

Currently, Ghella is working on some of the biggest tunnelling projects around the world, including the Follo Line in Oslo, the Sydney Metro and the Riachuelo sewage system in Buenos Aires.

Read more about Ghella

Who is Abergeldie Harker?

Abergeldie Harker is a tunnelling and microtunnelling specialist with expertise in the water, wastewater, stormwater, power and rail infrastructure sectors.

The company has successfully delivered complex underground construction projects across New Zealand over the past four decades and is one of New Zealand’s foremost shaft sinking and pipejacking contractors.

Read more about Abergeldie Harker

When will the construction begin and how long will it take?

Construction will begin next year and continue until 2025.

What is the cost of the Central Interceptor?

The cost of the Central Interceptor is estimated at $1.12bn NZD

Who is overseeing construction of the project?

Watercare which is an Auckland Council-owned organisation, is overseeing the construction of the project.

How big and long will the Central Interceptor be?

At 4.5 metres diameter, it will be 13 kilometres long and will run from Western Springs to a new pump station at the Māngere Wastewater Treatment Plant. It will lie between 15 and 110 metres below the surface. It will cross the Manukau Harbour at a depth of approximately 15 metres below the seabed. Along the proposed route, it will connect to the existing trunk sewer network to divert flows and overflows into the tunnel.

Which Contractors were shortlisted to build the tunnel?

The shortlisted contractors were:
CPB Contractors;
– Ghella-Abergeldie Harker Joint Venture;
– Pacific Networks, comprising McConnell Dowell, Fletcher Construction and Obayashi; and
– VINCI Joint Venture, comprising VINCI Construction Grands Projects, HEB Construction and Solentache Bachy.

Watch the video about this project here

Source: Ghella, Watercare, Abergeldie Harker, ANZIP

Do you want to work in New Zealand?

New Zealand is experiencing a very strong population growth with Auckland’s population increasing by 3% every year and predicted to reach 2 million people by 2028. It is not surprising then, that the New Zealand government is allocating a substantial amount of its budget to improve its economic and social infrastructure over the coming years.

According to the National Construction Pipeline report 2018, compiled by the Building Research Association (BRANZ) and Pacifecon (NZ) Ltd., New Zealand’s total construction value has been around $37 billion for each of the last two years.

This figure will likely increase from 2021 to over $41 billion in 2023. Infrastructure spend which constitutes 19% of the total current value, is forecast to reach 7.3 billion in 2023.

Transport, water and subdivision projects have dominated the infrastructure activity in 2018 with local governments being the main initiator of these projects.

The Wellington region saw the strongest growth in total construction value in 2017 and is expected to grow further together with Auckland and Waikato/Bay of Plenty.

Infrastructure activity is predicted to grow 10% in Auckland (to over $3b), 9% in Waikato/Bay of Plenty ($1.4b), 4% in Wellington ($0.5b) and 3% (to $1.4b) in other regions between 2017 and 2023.

We have a variety of roles in New Zealand and work with top tier and mid-tier contractors.

If you are considering relocating, our Consultants are dedicated to making your career transition as smooth as possible.

To discuss employment opportunities, please get in touch with us on +61(0) 730639581 or email [email protected] with the headline WORK IN NEW ZEALAND.

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