The Nigerian Government has explained the cause of the national grid collapse around 11:20 am on Wednesday, September 10, 2025.
According to the Nigerian Independent System Operator, NISO, Wednesday’s grid collapse was caused by the tripping of a generation company, resulting in a significant load drop, which cascaded to other GenCos and led to a system disturbance.
NISO, responsible for the country’s national grid, made this known in a statement on Wednesday, noting that restoration of the national grid commenced immediately.
It stated that an investigation has begun to determine both the immediate and root causes of the grid collapse.
“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,” NISO said.
