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The Nigerian Independent System Operator (NISO), a unit of the Transmission Company of Nigeria (TCN), has explained that Friday’s national grid collapse was caused by the simultaneous tripping of several 330kV transmission lines, along with the disconnection of some power generation units connected to the grid.
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.
According to the operator, restoration activities began at about 1:15pm in line with established grid recovery and restoration procedures.
NISO disclosed that power supply had been successfully restored to several locations, including Abuja, Osogbo, Benin, Onitsha, Sapele, Jebba, Kainji, Shiroro and parts of Lagos, while restoration efforts were ongoing across other parts of the country.
The system operator added that a comprehensive investigation is underway to determine both the root and contributory causes of the disturbance.
Data from NISO also showed gradual improvement in power generation as restoration continued. At 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 also recorded notable recovery, with the eleven electricity distribution companies (DisCos) collectively receiving a total load allocation of 1,540 megawatts.
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 recorded no allocation at the time of the report. Yola and Jos DisCos received the lowest allocations at 30MW each. Enugu DisCo was allocated 100MW, Benin DisCo 70MW, while Kano and Kaduna DisCos received 100MW and 150MW respectively.
NISO said restoration efforts would continue until full stability is restored to the national grid.
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