High winds have damaged Powerco's electricity network in Coromandel and South Waikato, causing wide-spread power cuts.
Powerco Acting Electricity Operations Manager Phil Marsh said the first of the power cuts occurred around midnight.
A total of 14,000 customers have experienced power cuts through the night and this morning, with the majority in South Waikato.
“Field crews are working to restore supply as quickly and safely as possible,” Mr Marsh said.
He said power lines that had fallen to the ground must be treated as live at all times.
“Stay away from any downed power lines and call Powerco’s emergency number 0800 272727.”