Politicians from Labour, National, the Greens, NZ First and ACT met on Thursday night for the Big Infrastructure Debate, hosted by Engineering New Zealand in partnership with Stuff and moderated by Rebecca Wright. The one-hour debate, livestreamed on Stuff.co.nz at 6.30pm on 6 August, drew agreement across party lines on one central proposition: the boom-and-bust cycle that has characterised New Zealand infrastructure spending for decades needs to stop.

Engineering NZ chief executive Dr Richard Templer set the stakes at the outset. Stop-start investment in infrastructure had cost New Zealand billions in lost productivity, he said. Templer called on parties to commit to long-run infrastructure investment, follow Infrastructure Commission recommendations, and invest 70 to 80 percent in renewables and maintenance.

The commission's own framework has been in the public domain since mid-2025. In June 2025, the Infrastructure Commission released what it described as a "once-in-a-generation" National Infrastructure Plan, setting out a 30-year vision and flagging the need for sustained additional investment in hospitals and electricity. Infrastructure Commission chief executive Geoff Cooper had previously briefed politicians on the pipeline of projects expected across the country.

Labour's Kieran McAnulty told the debate that a change in leadership did not need to change the approach to infrastructure. He called for prioritising infrastructure without politicising it, and pointed to a recent congestion charge law that passed Parliament unanimously as evidence that cross-party agreement was achievable in practice.

NZ First's Shane Jones pressed the panel on whether there should be a greater focus on maintenance and repair within the infrastructure spend, rather than new build alone. The question aligns with the commission's emphasis on the renewals backlog, and with Templer's call for a substantially larger share of investment to go to maintenance.

ACT's Simon Court took aim at what he called "gold-plating" in public works. A basic bridge that gets built is better than a perfect bridge that never gets built, Court said. Green MP Julie Anne Genter said she had been calling for more basic infrastructure projects for years, suggesting some common ground between ACT and the Greens on the principle, if not the policy detail.

Genter's policy emphasis was different. She called on central government to support local councils with more funding and more affordable public transport, and argued for more local control over funds so communities could shape infrastructure according to their own needs. That positions the Greens' approach around devolution and council capacity rather than the value-for-money framing Court was working with.

The debate comes in an election year, with the 54th Parliament comprising 6 parliamentary parties and 123 MPs across 65 general electorate seats. Infrastructure has been a recurring point of tension between the government and opposition, but the debate's format, with all five parliamentary parties represented, put the areas of agreement on the record.

The broader context here matters. The political incentive structure in an MMP system rewards parties for differentiating themselves, and infrastructure has historically been fertile ground for that. Governments cancel projects started by their predecessors; oppositions promise to revive them. What the debate established is that all five parties are at least willing to share a stage and say the cycle is a problem.

Whether that rhetorical alignment survives the campaign trail and post-election coalition negotiations is another matter entirely. McAnulty's congestion charge example is instructive: unanimous passage is rare, and it took a specific, contained piece of legislation to get there. The harder test will be whether the parties can sustain consensus across a 30-year investment horizon when electoral pressure pushes in the opposite direction.

Engineering NZ's ask is concrete: commit to the Infrastructure Commission's recommendations, direct the bulk of investment to renewables and maintenance, and break the pattern. The parties have now heard that ask, on the record, in front of an audience.