The warning follows a fire at a transformer in Burwood, Christchurch, last month, where a man was found critically injured and died at the scene.
It appeared he may have been trying to retrieve copper from the transformer.
Police said the fatality was a reminder of the dangers of tampering with power infrastructure. And EA Networks echoed the reminder.
Theft and tampering with critical electrical assets can make equipment unsafe, disrupt power supply and put the public and crews at serious risk, the power company said.
EA Networks chief executive Onno Mulder said there had been a significant increase nationwide in copper wires cut and stolen from across the network.
“Recent incidents nationally have shown that tampering with this infrastructure can have serious safety consequences,” he said.
“People who interfere with electrical assets put themselves in danger and increase the risk of electric shock for our crews and anyone in the community who may come into contact with damaged equipment.
“Every time copper is removed, our teams have to treat that site as potentially unsafe until it's been inspected and repaired.
‘‘That can delay work and increase disruption for our customers.’’
Mulder urged members of the Mid Canterbury community to report any suspicious behaviour or damage to power poles and electrical equipment.
‘‘If something doesn't look right, it's always better to report it,’’ he said.
‘‘By speaking up, people are helping protect their neighbours, our crews and the wider community.’’
Anyone who sees suspicious people or vehicles interfering with power poles, cabling or other electricity network equipment should contact the police.
• If the situation is urgent or dangerous, call 111. Anyone who notices loose wires, damaged poles or other signs of damage is urged to report it to EA Networks. Call 0800 430 460 to report damage to electricity infrastructure.
