"Unison may be able to arrange a temporary disconnection for safety if you are working within 4m of overhead power lines and can assist with locating underground cables on your property."
People should also be aware of trees growing too close to power lines.
"If you spot a tree growing close to power lines, Unison can arrange for a free inspection and quote from our vegetation team. The tree may be eligible to be removed or trimmed at our cost if we have not cut it before."
Mr Gough said trees and branches hitting power lines caused about 20 per cent of unplanned power cuts.
"Last summer around 20,000 customers experienced an outage over the three months due to vegetation faults on Unison's network. Keeping trees at least 4m from the network helps to keep everyone safe and the power on."
Customers with trees that need urgent attention, who would like a safety disconnection or to locate underground cables should call 0800 2 UNISON or visit the website www.unison.co.nz.