National Grid Collapse Caused By Fault At Gombe Substation — NISO

The Nigerian Independent System Operator (NISO) has confirmed that a voltage disturbance at the Gombe transmission substation caused Tuesday’s national grid collapse.

NISO disclosed this in a statement issued on Tuesday, alongside updates on repair and restoration efforts across the power network.

According to the system operator, the incident led to a partial system collapse, making it the second grid disturbance recorded in 2026.

NISO said electricity supply in the affected areas has since been fully restored following immediate corrective actions by its technical teams.

The operator explained that the disturbance originated at the Gombe transmission substation and then spread to other parts of the national grid.

It stressed that the incident did not amount to a total system collapse, contrary to reports by some media organisations.

“The national grid has been fully restored, and electricity supply across the affected areas has since returned to normal,” NISO said.

“The incident only affected part of the national grid, therefore not a total collapse,” it added, noting that the event involved the tripping of some transmission lines and generating units.

NISO said restoration efforts began shortly after the disturbance and were completed within a few hours.

The system operator disclosed that the voltage disturbance quickly propagated across the transmission network, affecting several substations beyond Gombe before stabilisation measures were implemented.

According to NISO, the disturbance spread to the Jebba, Kainji and Ayede transmission substations, while some transmission lines and generating units tripped during the incident.

It said corrective actions were immediately deployed to stabilise the system and restore normal grid operations.

Nigeria’s power grid has experienced recurring disturbances in recent years. In 2025, the national grid collapsed multiple times, with the last incident recorded on December 29.

Tuesday’s incident represents the second grid collapse in 2026.