If you have trees on your property that are within 4 meters of overhead powerlines then you will need to contact an approved contractor. Below are links to every lines company in New Zealand that either ask you to directly contact them to get your trees trimmed or include approved contractors in your area.
Tree Trimming Near Powerlines Northpower
What you need to know | Vector Limited
Service providers — Counties Energy
Trees near lines (powerco.co.nz)
Trees and Power Lines - Waipa Networks
Tree Safety - The Lines Company go to this form Inquiry about trees (wufoo.com)
Get my trees trimmed (unison.co.nz)
Get My Trees Trimmed | Horizon Networks
Get my trees trimmed (centralines.co.nz) go to this form tree trimming form (centralines.co.nz)
Home (scanpower.co.nz) go to this form Treesmart - Tree & Vegetation Management
Keeping trees trimmed | Wellington Electricity (welectricity.co.nz)
Trees & Power Lines | Buller Electricity Limited
Trees and power lines | MainPower NZ Ltd
Trees near power lines » EA Networks
Alpine Energy - Tree management go to this page Third-Party-Tree-Service-Providers.pdf (alpineenergy.co.nz)
Trees Near Power Lines | Network Waitaki
Trees and power lines | Aurora Energy Limited
Approved contractors – PowerNet
Contact SIESA | Southland District Council (southlanddc.govt.nz)