Some suburbs in the east of the city have been hit with a power outage.
Orion, the lines company, says about 3400 customers are without power, in Burwood, Dallington, Mairehau, Marshland, Shirley and Westhaven.
Orion has estimated power will return at about 5.30pm to the affected suburbs.
Christchurch Transport Operations Centre issued a warning to motorists that traffic signals are down.
“Drivers are advised to apply the give way rule,” a spokesman said.