The Nigerian Independent System Operator (NISO), a unit of the Transmission Company of Nigeria (TCN), has attributed Friday’s national grid collapse to the simultaneous tripping of several 330kV transmission lines and the disconnection of some grid-connected power generation units.
In a statement released on its official social media platforms on Friday, January 23, NISO said operational reports confirmed that the combined incidents triggered the system disturbance that led to the grid failure. It added that restoration activities began at about 1:15 p.m., in line with established grid recovery and restoration procedures.
According to the operator, power supply has since been restored to Abuja, Osogbo, Benin, Onitsha, Sapele, Jebba, Kainji, Shiroro and parts of Lagos, while restoration efforts are continuing progressively in other parts of the country.
NISO disclosed that a comprehensive investigation is underway to determine the root and contributory causes of the disturbance. Data from the system operator also indicated gradual improvement in power generation as restoration continues. As of the time of filing this report, seven generation companies were contributing a combined total of 1,118.80 megawatts to the national grid.
Distribution load allocation has also shown significant recovery, with the eleven electricity distribution companies (DisCos) collectively allocated a total of 1,540MW. Ikeja DisCo recorded the highest allocation at 350MW, followed by Abuja DisCo with 270MW. Ibadan DisCo received 240MW, while Eko DisCo was allocated 200MW.
Port Harcourt DisCo had no allocation at the time of the report, recording 0.00MW. Yola and Jos DisCos received the lowest allocations at 30MW each. Enugu DisCo was allocated 100MW, Benin DisCo 70MW, Kano DisCo 100MW and Kaduna DisCo 150MW.
NISO said restoration efforts would continue until full stability is restored to the national grid.
