"Kia ora, we are aware of the power outages in Waiwhetu, Gracefield, Waterloo and Woburn. It was caused by a swan hitting a power line. Wellington Electrical are currently onsite repairing the damage."
A council spokeswoman said there were reports the swan was "deceased".
As of 10am only 145 customers remained affected by the outage, which is expected to be resolved fully by 11.45am.