New Zealand’s Environment Court Backlog Hits Record High as Climate Cases Surge

New Zealand’s Environment Court is drowning in an unprecedented 847-case backlog as climate-related litigation surges across the country. The crisis is threatening to derail major infrastructure projects and resource consents, with some cases now facing three-year delays.

The Environment Court’s case backlog has exploded by 34% in the past 18 months, reaching a record 847 active cases as of May 2026 — the highest number since the court’s establishment in 1996. Climate change considerations are now embedded in virtually every significant resource consent application, creating a complex web of legal challenges that’s choking the system.

“We’re seeing an avalanche of cases where climate impact assessments are being challenged, either for being too weak or too strict,” says Environment Court Judge Sarah McKenzie. “Every wind farm, every housing development, every industrial facility now triggers extensive climate litigation. It’s unprecedented.”

Infrastructure Projects in Limbo

The backlog is hitting major projects hard, with several billion-dollar infrastructure developments now stalled in legal limbo. The proposed $2.8 billion Northland transmission upgrade has been delayed 14 months due to climate impact disputes, while three separate renewable energy projects worth a combined $1.6 billion are stuck awaiting court decisions.

Resource Management Law Association president David Parker warns the delays are becoming economically damaging. “We’re talking about critical infrastructure that’s needed for our climate goals being held up by the very climate legislation designed to accelerate the transition,” Parker told the Herald this week.

According to Chapman Tripp’s latest Environment Court Crisis Report, the finding showed average case resolution times have blown out to 28 months, compared to 12 months in 2020.

Climate Law’s Unintended Consequences

The surge stems largely from the Zero Carbon Amendment Act’s requirement for all major resource consents to consider climate impacts — both emissions and resilience. While environmentally progressive, the law has created a legal minefield where almost any decision can be challenged on climate grounds.

“The legislation was well-intentioned, but it’s created a system where every consent becomes a mini-climate court case,” explains environmental lawyer Rebecca Thomson from Russell McVeagh. “Developers are spending more on legal fees than actual environmental mitigation.”

Local councils are struggling too, with Christchurch City Council reporting a 200% increase in resource consent appeals since climate considerations became mandatory. Mayor Phil Mauger says the delays are “strangling development” in the city.

Economic Ripple Effects

The court crisis is rippling through New Zealand’s economy, with the Construction Industry Council estimating that delayed projects are costing the sector $340 million annually in lost productivity. Housing developments are particularly affected, with several major Auckland projects postponed indefinitely.

Property developer Mike Greer, whose company has five projects caught in the backlog, describes the situation as “absolutely bonkers.” He tells me: “We’re trying to build climate-resilient housing, but we can’t get consent because the court is too busy dealing with climate cases. It’s madness.”

The government has allocated $12 million for additional Environment Court judges, but legal experts say new appointments won’t clear the backlog until late 2027 at the earliest. Meanwhile, businesses are increasingly looking at fast-track legislation or private mediation to bypass the court system entirely.

Uncertain Path Forward

Environment Minister James Shaw acknowledges the system is “under severe strain” but maintains that climate considerations can’t be sidelined for expediency. However, with election year approaching and business groups demanding urgent reform, pressure is mounting for legislative changes to streamline the process.

Legal observers predict the backlog could hit 1,000 cases by year’s end unless dramatic intervention occurs. The irony isn’t lost on anyone — New Zealand’s ambitious climate laws may be inadvertently slowing the very green infrastructure needed to meet those climate goals.

First discussed by: Environment Court Registry, Chapman Tripp