The Nigerian Electricity Transmission System, known as the national grid has collapsed, resulting in a loss of power supply to homes and businesses across the country.
The disruption in the power supply which was the first under the Nigerian Independent System Operator (NISO), an agency newly created to manage Nigeria’s electricity grid, to improve stability, occurred at about 11:23 hrs today.
According to the data obtained from the independent system operator, the megawatt (MW) generated dropped from 2,917.83 (MW) to 1.5 (MW) between 11 am and 12 pm on Wednesday, plunging the country into partial darkness.
The outage was first reported by the Abuja Electricity Distribution Company (ADEC), in a Public Notice to its customers.
According to the Public Notice, AEDC said: “Please be informed that the power outage currently being experienced is due to a loss of supply from the national grid at 11:23 hrs today, affecting electricity supply across our franchise areas.
“Rest assured; we are working closely with the relevant stakeholders to ensure power is restored once the grid is stabilized. Thank you for your patience and understanding.”
In a swift reaction, the Management of NISO confirmed that the system disturbance occurred at about 11:20 hrs today.
The statement read thus: “The Nigerian Independent System Operator (NISO) informs the general public that the national grid experienced a system disturbance at 11:20 hrs on 10/09/2025.
“The disturbance was caused by the tripping of a GenCo, resulting in a significant load drop, which cascaded to other GenCos, leading to a system disturbance. NISO immediately commenced restoration of the grid at 11:45 hrs, beginning with supply to Abuja from the Shiroro power plant, and substantial restoration has been achieved across the country.
“A full investigation into the immediate and remote causes is underway. The outcome (s) of the investigation report would determine the remedial and proactive actions to be taken to forestall future occurrences.
“We crave your indulgence to bear with us as restoration is still ongoing.”
