A gas plant fails at a time other power plants are undergoing planned maintenance and capacity testing.
The federal government said the latest dip in electricity generation in the country is as a result of a partial shutdown of a gas plant.
The shutdown has caused power outage across the country for days.
The government said the Oben gas plant collapsed and failed to generate supply. Isa Sanusi, spokesperson to the Minister of Power, Abubakar Aliyu, said this in a statement on Saturday.
He said the plant was shut down to allow for the repair of critical gas processing equipment.
Eko Electricity Distribution Company informed its customers of power interruption in the early hours of Saturday.
"Dear Esteemed Customers, we regret to inform you of the significant drop in load allocation to our network which has led to massive load shedding," it said.
"Kindly bear with us as we are currently working with our TCN partners for a swift resolution."
Mr Sanusi said the incident occurred at a time other power plants are undergoing planned maintenance and capacity testing.
"We wish to notify the public that Seplat Energy Plc has mobilized equipment, material and personnel to site with a view to expediting the restoration of normal gas supply to the affected power plants," he said.
"We have been assured that the repair work would be concluded this weekend and normalcy will be restored. While pleading with electricity consumers with the current state of supply, we wish to assure the general public that efforts are being made for a sustained improvement of supply across the country."
Nigeria has struggled with poor power supply for years, often caused by generation and transmission problems. In 2022 alone, the country's national grid has collapsed at least five times.
Editor's Note: A glitch in our editing process caused a misattribution of the cause of the recent power outage to grid collapse. This has been corrected and we apologise for the error.