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Power has been restored to more than half of the 25,000 Victoria homes and businesses that were cut off by a substation fault.
The outage happened about 6.30pm (local time) on Friday in the coastal town of Sorrento, south of Melbourne.
United Energy spokesman Stuart Allott said power has been restored to 15,000 premises, with most properties expected to regain power by 9pm.
"The fault has been fixed," Mr Allott told AAP.
He said there were minor power interruptions during the afternoon caused by an overhanging tree hitting electricity wires, and this may have weakened the network.