More than 1100 homes in Porirua are without power and the cause is still unknown, according to Wellington Electricity.
Affected areas included Papakowhai, Porirua City Centre, Paremata, Aotea, Porirua and Pukerua Bay.
Wellington Electricity said the outage was not likely to be related to the large scrub fire at Porirua yesterday morning, because it is on a different power supply line.
Power is estimated to be restored by 12.30pm, it said.
RNZ