The Nigerian Independent System Operator (NISO) has announced the full restoration of electricity supply nationwide following a system disturbance that disrupted power distribution across parts of the country.

NISO’s management disclosed this in a statement issued in Abuja on Monday, noting that system stability had been fully normalised.

According to the operator, investigations into the cause and sequence of events leading to the disturbance are ongoing, while measures are being put in place to prevent a recurrence of such major system incidents.

“NISO wishes to inform the general public and relevant stakeholders that the national grid experienced a system disturbance at 2:01 p.m. on Monday, which led to a partial system collapse,” the statement said.

It recalled that the vandalisation of the Lagos–Escravos–Lagos gas pipeline on December 10 had resulted in reduced power generation nationwide, further weakening the national grid.

Preliminary reports indicated that the disturbance involved the tripping of several generating units and critical 330-kilovolt transmission lines, resulting in widespread power outages across parts of the country.

However, NISO said the Delta generation complex successfully operated in island mode at the 132kV sub-transmission level, ensuring continued electricity supply to Oghara, Amukpe, Benin, and Efunrun substations.

A total of 114 megawatts was generated from four units at the Delta Thermal Power Station during this period.

In line with established operational procedures, the operator said it promptly initiated system response measures using its dispatch and monitoring tools at the National Control Centre (NCC) in Osogbo.

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