New Zealand’s Watercare is set to take to market two wastewater projects in Auckland involving 5.55km of tunnelling.
The company is seeking expressions of interest from domestic and international contractors to deliver the Motions Wastewater Catchment Improvements Project and Avondale Collector Project.
The projects, worth around NZ$500m (€250.6m), will connect Auckland’s western catchments to the 16.2km Central Interceptor.
Expressions of interest for the Avondale Collector Project open on November 13 and for Motions in early 2027.
The Motions project will deliver a 3.2km wastewater tunnel with an additional 1.7km of connection pipes linking the Motions catchment to the Central Interceptor at Western Springs, while reducing overflows into Motions Creek and surrounding waterways.
The Avondale project will deliver a 2.35km wastewater tunnel and 650m of connection pipes to divert flows to the Central Interceptor.
Watercare chief programme delivery officer Mark Crowle said the projects built on the recently completed Central Interceptor wastewater tunnel and the Herne Bay Collector, which is under construction.
“The Central Interceptor is already improving Auckland’s waterways. These projects will extend those benefits by reducing overflows in our western catchments while creating capacity for future growth,” he said.
“They’re also a significant opportunity for contractors who want to help deliver the next generation of city-shaping infrastructure.”
The projects are part of Watercare’s planned NZ$15.2bn investment in Auckland’s water and wastewater infrastructure over the next decade.
The NZ$1.66bn (€850m) Central Interceptor – New Zealand’s largest wastewater project – became fully operational in July. The project was delivered by Ghella, which is now building the 1.7km Herne Bay Collector.
