Residents clearing trees in Upper Hutt caused a power cut to almost 5000 customers.
The Trentham substation lost supply just before 11am and it took almost an hour to get everyone back on the grid, Wellington Electricity spokesman Hugo Armstrong said.
The company believes the reason for the loss of power was landowners clearing trees in Silverstream and it will be following up with those responsible.
"Tree clearing near power lines can be dangerous and also costly and inconvenient for the rest of the community," Mr Armstrong said.
He said anyone looking to clear trees near power lines needed to check with Wellington Electricity first or hire a professional.
Any customers affected by the power outage should have had their power restored.
- © Fairfax NZ News
Would you support your local council paying the 'living wage'?Related story: Council's living wage blowout