The Problem the Amendments Address
Cyclone Gabrielle in February 2023 demonstrated with painful clarity the vulnerability of New Zealand’s electricity distribution network to tree falls. Trees falling outside the existing Growth Limit Zone — the defined clearance area around power lines — caused power outages that left 68,000 households without heating, lighting, internet, and access to essential appliances. The existing regulations gave lines owners tools to manage trees within the Growth Limit Zone, but no mechanism to address trees outside that zone that nonetheless posed a credible fall risk due to height, lean, or proximity to lines.
Energy Minister Simon Watts has confirmed amendments to the Electricity (Hazards from Trees) Regulations 2003 that directly address this gap, with the intent of protecting the security of electricity supply infrastructure that, as Watts notes, is “critical to electrifying New Zealand’s economy.”
What the Amendments Do
Two key measures are introduced. First, lines owners gain the ability to assess the likelihood and potential impact of a fall for trees they consider a risk to lines outside the Growth Limit Zone, and to issue a formal notice to the landowner. This creates a mechanism for proactive risk management rather than waiting for a tree to fall and then assessing the damage. Second, new restrictions on planting in non-forested land outside urban areas prevent the planting of tall-growing species that would, at maturity, create the same risk the amendments are designed to address.
The amendments were developed with input from lines owners, forestry interests, and affected landowners — balancing electricity security, property rights, and the Emissions Trading Scheme revenues that forestry landowners derive from standing trees. A lines owner notice does not automatically require felling; it creates a formal process for assessing and managing the risk.
Insurance and Liability for Property Owners
For residential property owners, the regulatory changes are accompanied by important insurance and liability considerations. The Insurance Council of New Zealand notes that trees themselves are not generally covered by home policies — but damage that a tree causes to insured structures is covered, as are tree removal costs where the tree caused the covered damage. Liability for tree damage to neighbours’ property is not automatic; it depends on whether the owner was negligent in maintaining or removing a clearly dangerous tree.
Practical risk reduction steps recommended by the ICNZ: regular assessment of trees on the property, particularly after storms; pruning or removal of weakened trees before they become hazards; hiring a qualified arborist for large or dangerous work rather than attempting DIY removal; and choosing appropriate tree species and locations when planting to avoid future conflict with power lines or structures.
