Residents in Shirley Dallington and Marshland could be without power until tomorrow morning.
A power box on Birkdale Drive caught fire at 5:47 pm.
Fire and Emergency crews from Anzac Fire Station were called to the scene to put the blaze out.
At one point, 1400 customers were without power.
Orion said a contractor was at the scene connecting cables to enable the network to get power on to the remaining area.
“This work will unfortunately take some time and power is not expected to be back on until the early hours of tomorrow morning. Thank you for your continued patience.”