New Zealand's Government has signed a public-private partnership agreement with the Northway consortium for the Warkworth to Te Hana section of the Northland Expressway, reaching financial close.
The deal covers the first section of the wider Northland Expressway and marks what the Government described as the largest public-private partnership undertaken in New Zealand. Under the agreement, the consortium will design, build, finance, maintain and operate the route.
Transport Minister Chris Bishop said early work would begin soon, including detailed design, site mobilisation and initial construction in the coming months. Main construction is scheduled to start later. The road is expected to open in 2033, with full works due for completion in 2034.
The planned route will run for 26 kilometres and include four lanes, with grade-separated interchanges at Warkworth, Wellsford and Te Hana. The works also include 15 standardised bridges, two underpasses, large culverts, 12 wetland stormwater treatment basins and twin tunnels of about one kilometre through Kraack Hill above the Dome Valley near Dome Forest.
Funding model
The final project cost has a net present value of $3.649 billion, according to the Government. It said that figure is AUD $251 million below the $3.9 billion public sector comparator approved by Cabinet, which was used to estimate the cost of delivering the road through a traditional public procurement route.
Cabinet had previously agreed that the Crown would make a capital contribution to construction. To support that, the Government provided NZTA with a $1.6 billion 10-year loan, with payments to the contractor due to begin in the later stages of construction.
Once the road opens, NZTA is expected to begin regular unitary charge payments over a 25-year operating period. Those payments will be linked to performance, safety, maintenance and availability measures, with deductions if standards are not met.
This structure leaves the private partner responsible for financing, construction, long-term maintenance and operational performance under the contract. At the end of the agreement term, the road is due to be handed back to NZTA.
Procurement process
NZTA shortlisted three consortia after what the Government described as strong market interest in the project. Northway was named preferred bidder earlier this year before the agreement was finalised.
The Government said it drew on lessons from previous projects, including Transmission Gully, as well as international market practice. The procurement process included earlier work on property and consents, changes to risk allocation, bid cost reimbursement, retention of intellectual property by NZTA, price evaluation at the request for proposal stage and an optimisation phase between final bidders.
Northway includes Acciona Concesiones, Aberdeen Investments, Global Sustainable Infrastructure GP IV and Acciona Construction New Zealand, alongside New Zealand partners Downer New Zealand and AECOM.
A Gateway 3 review of the procurement and preparation for financial close gave the project a Green/Amber delivery confidence assessment. NZTA accepted all seven recommendations from the review.
Economic case
The Government has framed the road as both a transport and regional development project. Expected benefits over the life of the expressway include fewer deaths and serious injuries, shorter travel times, fewer weather-related closures and the removal of about 1,000 heavy vehicles a day from the existing SH1 main streets through Wellsford and Te Hana.
It also said every dollar invested is expected to return $1.60 in wider economic benefits to New Zealand. The administration has argued that a more reliable road connection between Auckland and Northland would support freight movement and improve resilience on a corridor that has faced severe weather disruptions.
Local supply chains are also expected to play a material role in delivery. The consortium expects about 60 per cent of total physical works spending to flow through local suppliers and subcontractors, covering earthworks, drainage, pavements, bridges and other civil engineering work.
Northway has also indicated it plans to create internships, graduate roles, apprenticeships and school-to-work pathways, with a focus on young people in Northland, including Māori and Pasifika participants.
"Northland has incredible potential and Warkworth to Te Hana is one of the most significant infrastructure investments this Government is making to support jobs, unlock economic growth, and provide a safer, more resilient connection for people and freight between Auckland and Northland," Bishop said.
"This PPP represents good value for taxpayers. The final project cost has a net present value of $3.649 billion, around $251 million below the $3.9 billion public sector comparator approved by Cabinet in March last year, which estimates what the project would cost under traditional public sector procurement.
"Every dollar invested is also expected to return $1.60 in wider economic benefits to New Zealand.
"Ultimately, the Northway consortium put forward the strongest overall proposal, providing the best balance of price, quality and risk. The agreement provides greater certainty over costs, reduces the risk of disputes and delays during construction, and delivers better value for taxpayers over its lifetime.
"NZTA will also begin making regular unitary charge payments once the road opens. These payments are linked to agreed performance, safety, maintenance and availability standards, helping protect value for taxpayers over the 25-year operating period. Financial deductions apply if those standards or KPIs are not met."