Downtown Auckland has ground to a halt with power outages causing traffic jams and public transport delays in the CBD.
Power was initially out at Britomart, Newmarket and Parnell but was soon restored just after 1.30pm.
However, the impact is set to be felt for hours with train services delayed until 3pm.
"Power at the Britomart Train station has now been restored. Trains will now be arriving and departing from Britomart," Auckland Transport announced.
"Please expect delays and cancellations until services return to normal. Normal services will resume at 3.00pm."