The Nigerian Independent System Operator has denied claims that the national electricity grid collapsed. The agency, known as NISO, said the event was a partial disturbance on the system and that the affected portion has been restored. Its position contradicts reports that circulated suggesting the entire network had gone down. Claims of grid collapse have become a recurring source of friction within the power sector. NISO moved to correct the record quickly after the disturbance, describing it as limited rather than nationwide. The operator has not published full technical details of what failed or how the restoration was carried out. Customers who lived through the disturbance were left waiting for a clearer official account of supply conditions.