The Transmission Company of Nigeria (TCN), on Sunday, disclosed that the national grid is fully restored after what it described as a partial disturbance at about 15.09 hours on Saturday.

TCN, in a statement signed by its General Manager of Public Affairs, Ndidi Mbah, said the system disturbance is suspected to have been triggered by the unexpected tripping of three units of a power generating station.

Recall that Tribune Online reports on Saturday that the national grid has again collapsed, leading to a blackout across the country.

However, in the statement released by TCN on Sunday, the unexpected tripping of three units of a power generating station suddenly removed 313MW from the grid, causing system instability that led to the loss of bulk supply to a section of the national grid.

“The system disturbance, which brings to three, the partial grid disturbances, with one total disturbance this year, is suspected to have been triggered by the unexpected tripping of three (3) units of a power generating station, which suddenly removed 313MW from the grid, causing system instability that led to the loss of bulk supply to a section of the national grid,” the statement read.

It added that “the System Operator reacted to the sudden drop in generation which led to a dip in frequency, by islanding a section of the grid which includes the Ibom Power Station through which the company continued to feed Uyo, Aba, Itu, Eket, Calabar e.t.c even when the other section of the grid had no supply.

“The operators commenced grid restoration efforts immediately after the incident. At about 21.57 hrs yesterday, the entire part of the grid that was affected by today’s incident was successfully restored.”