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The Transmission Company of Nigeria TCN says that the nation’s grid was fully restored at 4.59 pm yesterday, 28th July 2021, after a grid collapse that occurred at about 12:20 pm the same day.


This was revealed in a statement made available to the media yesterday by the TCN Corporate Affairs General Manager Mrs. Ndidi Mbah in Abuja.


Mrs. Mbah also disclosed that the collapse was triggered by a sudden drop in system frequency to 47.21Hz.  According to the statement, “It is suspected that the sudden loss of 740MW from the grid, caused system instability and its eventual collapse.”



Mrs. Mbah however, explained that the reports received from SCADA and other power generating stations showed that at about 12.20 pm, two generating units tripped in one generating station while four equally tripped in another generating station, causing a loss of 261MW and 443MW respectively, bringing the total loss of electricity on the grid to 704MW.


She said that after the collapse, however, TCN’s system operators immediately commenced the restoration of the grid and by 12.46 pm, the power supply in Abuja was fully restored from Shiroro Generating Station. At 1.05 pm, TCN equally commenced grid restoration from the Delta Power Station, and at 4.59 pm, a full restoration of the entire grid was achieved. “We appreciate the government, electricity customers nationwide, and our international customers for their patience and note that TCN would continue to work hard to expand and maintain the stability of the national grid.” She stated.

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