The Ghana Grid Company LTD (GRIDCo) has confirmed that the power outage on Sunday, 3 March, was caused by a fault on a piece of equipment at the Mallam substation.
Some customers in the western areas of Accra, Winneba and Takoradi experienced a power cut on Sunday.
In a statement, GRIDCo said that their engineers have quickly isolated the faulty equipment for further investigation.
The company added that restoration of supply to affected customers started immediately.