Power has been restored to downtown Auckland after an outage crippled the centre city and forced the closure of Britomart rail station.

Vector had earlier warned that the CBD and Parnell could remain "without power for some time" after the lunchtime outage struck at about 12.30pm.

The cause is still being investigated.

The "chaotic" power cut spanned the city centre, and parts of Newmarket and Parnell, from about 12.30pm.

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Vector said just before 2pm that power had been restored to the CBD and Parnell.

Britomart train station was forced to close and multiple traffic lights stopped working.

Power was restored to Britomart soon after 1.30pm - but it could take until 3pm for normal services to resume.

Vector said at 1.45pm that power had returned to the CBD.

Vector's website shows the
Vector's website shows the "unplanned outage" areas in yellow.

Vector said at 1.45pm that power had been restored to the CBD, though parts of Parnell were not fixed.

Earlier, the company confirmed the outage had affected Quay St, parts of Auckland's CBD and parts of Parnell.

"Vector's electricity operations centre is remotely redirecting power flows to as many affected customers as possible, and our crews are currently working on the fault," the company said.

"Customers in these areas should prepare to be without power for some time while we respond to the outage. The objective of our crews is to do this as quickly as possible while ensuring the safety of our crews and the public."

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The power is out at Auckland's Britomart train station. Photo / RNZ
The power is out at Auckland's Britomart train station. Photo / RNZ

Rail services had to end at Newmarket for the Southern, Western and Onehunga lines, and at Orakei for the Eastern line.

Power was knocked out at Better Burger in Auckland's CDB, near Britomart. Photo / RNZ
Power was knocked out at Better Burger in Auckland's CDB, near Britomart. Photo / RNZ

Police confirmed traffic lights were out at multiple sites in central Auckland.

"A number of intersections in the Newmarket, Parnell and CBD have been affected.

"Police have received a number of calls in relation to this and will continue to monitor the situation."

Twitter user Bob Jewers said traffic lights stopped working at the intersection of Shortland Queen Sts at 12:30pm. "It's a bit chaotic."

A block of Symonds St - including parts of the University of Auckland - was also affected.

The university's law faculty had no power but it has now been restored.

Auckland Transport confirmed a "power outage" has hit the inner-city.

Traffic lights are out on the corner of Wyndham and Queen St. Photo / RNZ
Traffic lights are out on the corner of Wyndham and Queen St. Photo / RNZ