Power cut to 6000 Whanganui homes

Powerco is investigating the cause. Photo / File

Power has been restored after it was cut to more than 6000 Whanganui properties, including Whanganui East, Gonville, Castlecliff and some in the central city on Friday morning.

The outage occurred at 7.45am with power returning by 8.15am.

A Transpower spokesperson said the system was inadvertently tripped during routine upgrade work at the Whanganui substation.

Transpower is following up the cause to ensure it doesn't happen again and apologised for the sudden outage.

"We were pleased we were able to get it on quickly, because there was a crew close by."

Grid delivery general manager Mark Ryall was pleased Transpower could restore supply at 8.10am, after which Powerco reconnected its customers.

At Red Eye cafe on Guyton St a staff member said power only flicked off for around five seconds.

"When it turned off I thought 'oh no', but it came on again pretty quickly."