THE Transmission Company of Nigeria (TCN) has disclosed why the national grid collapsed for the 11th time in 2024 just after the same collapse happened on Tuesday.

The General Manager, Public Affairs of TCN, Mrs. Ndidi Mbah, said the collapse on Thursday was caused by a sudden rise in frequency.

In a statement, Mrs Mbah stated that the frequency spike was caused by issues encountered at one of TCN’s substations.

“The Transmission Company of Nigeria (TCN) wishes to inform the public that the national grid experienced a disturbance at approximately 11:29 AM this morning, caused by a sudden rise in frequency from 50.33Hz to 51.44Hz. Recovery efforts began immediately, and the Abuja Axis was restored within minutes. Recovery is still ongoing.

“The frequency spike was caused by issues encountered at one of TCN’s substations, which had to be shut down to prevent further complications. In addition to this, TCN is actively engaged in significant repair work on several critical transmission lines and substations. This includes the 330kV transmission line along the Shiroro–Mando axis, major upgrades at the Jebba Transmission Substation, and the restoration of the second Ugwuaji–Apir 330kV transmission line.

“Furthermore, following the submission of the investigative report on the causes of previous grid collapses, TCN has begun addressing the identified weaknesses in the transmission system,” she explained.

She disclosed that repair works have started to ensure restoration.

TCN, however, added that instability would persist until all major works are completed.

The spokesperson assured Nigerians of TCN’s commitment to improving the reliability of electricity supply.