The national grid late Monday collapsed leading to nationwide blackout.
Electricity distributors said they did not receive energy from the Transmission Company of Nigeria starting at about 7:00 p.m., as millions returned home after a long day at work.
Abuja Electricity said the failure started at 6:58 p.m. and assured customers that efforts had been ramped up to address the crisis.
The cause of the collapse was not immediately clear as spokesperson for the TCN was unavailable for comment.