Power and Renewable Energy Ministry Secretary Suren Batagoda said the cause of the island-wide power failure could be due to the tripping of a substation in Biyagama, Daily Mirror reported.
He said that engineers from the Ceylon Electricity Board were trying to find out the exact cause behind the blackout.
Water distribution from the Ambatale water distribution tank was disrupted owing to the power failure, the National Water Supply and Drainage Board said.
In September last year, a similar power blackout was reported due to technical problem.