A partial disturbance of the national grid which occurred about 3:09pm on Saturday has been fully restored, the Transmission Company of Nigeria (TCN) confirmed on Sunday.
TCN’s General Manager, Public Affairs, Ndidi Mbah, said in a statement in Abuja that the national grid was restored about 9:57pm on Saturday.
She stated that operators commenced restoration efforts immediately after the incident.
“At 9.57pm on Saturday, the entire part of the grid that was affected was successfully restored,” Mbah said in the statement.
“The system disturbance, which brings to three, the partial grid disturbances, with one total disturbance in 2024, is suspected to have been triggered by the unexpected tripping of three units of a power generating station.
“It suddenly removed 313 Megawatts from the grid, causing system instability that led to the loss of bulk supply to a section of the national grid,” she said.
Mbah stated that the system operator reacted to the sudden drop in generation, which led to a dip in frequency.
She explained that the system operator did this by islanding a section of the grid, which included the Ibom Power Station, through which the company continued to feed Uyo, Aba, Itu, Eket, Calabar and others, even when the other section of the grid had no supply.