Almost 200 homes in Aberdare in the Cynon Valley have been without power since last night after a technical fault.
Western Power says customers were taken off the power supply at around 9.45pm for safety reasons.
It has affected roads including Wind Street, Oak Street, Albert Street and Dumfries Street.
A spokesperson for Western Power says the fault is now fixed and power will be restored this morning.
– Western Power spokesperson
All repairs were complete by around 2.45am but we've waited until a reasonable hour as engineers need to enter each home affected to restore power. Power has already been restored to the properties that can be accessed externally. We must go into around 160 properties altogether but hopefully everyone will be back on within a few hours.