Brazen copper thieves last week entered properties in rural Manawatū and cut down power lines to sell for scrap.
Attacks on its roadside network is not a new problem for Powerco but the electricity distributor is worried the latest thefts in the Kimbolton area have involved private properties.
Powerco's general manager of service delivery and system operations Ian Skipworth said there has been a spate of thefts on their network since May.
"This latest move is a concern. There is a real threat of electrocution for those cutting the wire but they are also endangering the safety of people living on the properties.
"This week's incident involved service lines on a farm and when a farmer discovers the theft he has no idea if lines left dangling are live or not."