The Nigerian Independent System Operator (NISO),has blamed Wednesday’s national grid collapse on the tripping of a major Generation Company (GenCo).
This triggered a substantial loss of load that impacted other GenCos, leading to a cascading system failure, it said in a statement.
NISO said it has swiftly initiated restoration efforts at 11:45 a.m., starting with the restoration of power supply to Abuja from the Shiroro power plant.
According to the agency, significant progress has been made in restoring electricity across various parts of the country.
Restoration efforts are still ongoing, and NISO has appealed for public patience during this period,the agency said.
The agency has launched a comprehensive investigation to determine both the immediate and underlying causes of the disturbance.
The findings of the investigation will guide the implementation of remedial and proactive measures to prevent future occurrences.
The agency expressed gratitude for the understanding of Nigerians and reiterated its commitment to stabilizing the grid and ensuring a reliable power supply, adding that further updates will be provided as the situation evolves.
The statement reads in part: “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 ina 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”.