UPDATED: Power has been restored to Hawke's Bay about 75 minutes after simultaneous lightning strikes on two of the major transmission circuits running into the region.
Transpower said in a statement at 6.01pm that power was restored to around 80,000 homes and businesses.
"We would like to apologise to those in the affected areas for the inconvenience.
A power cut has hit the east coast of the North Island, with electricity reportedly cut between Hawke's Bay and Gisborne," the statement said
Unison said in a statement that the company had now completed the progressive restoration of supply to all Hawke's Bay customers.
"We advise any customers still without power to please report the fault to us on 0800 2 UNISON."