By ThePreview Team

 

The Nigerian Independent System Operator (NISO) said the collapse of the national grid on Tuesday was caused by a voltage disturbance which originated from the Gombe Transmission Substation.

NISO, in a statement signed by its management, said the voltage disturbance rapidly propagated across the network, affecting Jebba, Kainji, and subsequently Ayede Transmission Substations.

“The Nigerian Independent System Operator (NISO) wishes to state that at approximately 10:48 hours on January 27, 2026, the national grid experienced a voltage disturbance which originated from the Gombe Transmission Substation.

“The voltage disturbance rapidly propagated across the network, affecting Jebba, Kainji, and subsequently Ayede Transmission Substations,” the statement said.

It explained that the event was accompanied by the tripping of some transmission lines and generating units, resulting in a partial system collapse.

Restoration completed

“Appropriate corrective actions were immediately implemented to stabilise the system and restore normal operations. Restoration, which began at about 11:11 am has since been completed.”

READ ALSO:Again, Nigeria’s electricity grid collapses, throws cities into darkness

NISO said the incident only affected part of the grid and not a total collapse, noting that the national grid has been fully restored and electricity supply across the affected areas has since returned to normal.

Nigerians were on Tuesday morning thrown into darkness due to ‘system collapse’.

The latest development comes days after the national grid collapsed on Friday, marking the first such incident in 2026.

This latest collapse adds to a series that has raised concerns about the stability of Nigeria’s electricity system.