NISO Restores Power Supply Nationwide After Hours Of Disruption, System Disturbance, Partial Grid Collapse

…Probes cause of the disturbance

The Nigerian Independent System Operator (NISO) has successfully restored power supply nationwide, following hours of system disturbance which culminated to partial grid collapse on Monday.

According to a late Monday night statement by the NISO Management informing stakeholders of the resolution of the incident, “the National Grid experienced a system disturbance at 14:01 hours on Monday, 29 December 2025 that led to a partial collapse.”

The NISO management recalled that the Lagos–Escravos-Lagos gas pipeline was vandalized on 10 December 2025 which led to the shortage in power generation in the country and further led to the fragility and weakness of the national grid.

According to NISO, “Preliminary reports indicate that the disturbance involved the tripping of several generating units and critical 330kV transmission lines, resulting in a widespread impact on electricity supply across parts of the country.

“However, the Delta generation complex successfully operated on island mode at the 132kV sub-transmission voltage level. This enabled the continued supply of electricity to Oghara, Amukpe, Benin, and Efunrun 132kV substations, with a total generation of 114 megawatts from four units at the Delta Thermal Power Station.

“In line with established Operational Procedures, NISO promptly initiated system response measures using its dispatch and monitoring tools at the National Control Centre (NCC), Osogbo.

“Supply has been fully restored to all parts of the country and the system stability normalized.

“Investigations into the cause and sequence of events leading to the system disturbance are currently ongoing. Appropriate measures shall be put in place to forestall future reoccurrence of such major system incidents.”

NISO reassured Nigerians of its continued commitment to proactive grid management and the application of best operational practices to ensure the stability and reliability of the National Grid.