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TCN Restores National Electricity Grid 5hrs After Collapse


It took about five hours for the national electricity grid of Nigeria to be restored after it collapsed for the second time within a space of one month on Tuesday, August 23, 2021 at 1.06 pm.
Confirming the incidence and the restoration, the Transmission Company of Nigeria (TCN) in a statement said it commenced the immediate recovery of the grid at 1:19pm through Shiroro Generating Station and almost immediately restored electricity to Abuja axis.
“The Alaoji – Onitsha axis was restored at about the same time as Abuja, while the Shiroro – Mando axis, on the other hand, was restored by 3.42pm. By 6.57pm yesterday, the national grid was fully recovered and operational,” the stated noted.
Explaining the cause, TCN said, “The national grid experienced partial system disturbance at about 1.06pm yesterday, 23rd August 2021.The incident followed a sudden drop in system frequency from 50.18Hz to 47.63Hz that caused system instability and consequently the collapse of a part of the national grid.
“However, the partial system disturbance did not affect parts of the grid such as Afam Complex, Alaoji, Ikot Ekpene, Odukpani, and Calabar axis, which means that electricity supply to these areas was not interrupted by the incident.”
Reports from the Supervisory Control and Data Acquisition (SCADA) readings and some substations’ control panel readings by the System Operator (SO) showed that some units from a particular generating station tripped suddenly, causing an initial loss of 402 megawatts (MW) from the grid network. This caused a destabilising imbalance, which further caused the pulling out a total of 3,560MW from the grid that finally collapsed part of the national grid.
While appreciating the patience and understanding of the government and electricity consumers within the affected areas, TCN assured that it is consistently executing projects geared towards putting in place a very robust grid. It is equally pursuing a nationwide SCADA implementation that would further contribute to grid stability.

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