The Federal Government on Wednesday, the 10th of September, 2025, explained the cause of the national grid collapse, which occurred around 11:20 am on Wednesday.
In a statement, the Nigerian Independent System Operator, NISO, said the incident was triggered by the tripping of a generation company. This led to a major load drop that spread to other GenCos and caused a system-wide disturbance.
NISO, which oversees the grid, noted that restoration efforts began almost immediately. At 11:45 am, supply was first restored to Abuja from the Shiroro power plant, and significant recovery has since been recorded across the country.
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According to the statement, “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.”
As of Wednesday evening, electricity supply had been restored in parts of Abuja, while other areas are expected to follow as the process continues.