Nigeria’s electricity transmission network suffered a disruption on Tuesday following a voltage disturbance traced to the Gombe transmission substation, according to the Nigerian Independent System Operator (NISO).

In a statement issued while providing updates on recovery efforts, NISO clarified that the incident was not a complete shutdown of the national grid, contrary to early reports. The operator described the event as a partial system collapse.

NISO explained that the disturbance began at the Gombe substation before spreading across parts of the transmission network, triggering the tripping of some transmission lines and power generation units. As the fault propagated, substations in Jebba, Kainji, and Ayede were also affected.

The incident temporarily disrupted electricity supply in several areas, with power generation dropping to zero megawatts at about 11:00 am. However, technical teams were immediately mobilised to stabilise the system.

According to the system operator, corrective measures were implemented within hours, leading to the full restoration of electricity supply across the affected areas.
NISO emphasised that only sections of the grid were impacted and that the national transmission system is now operating normally.

Tuesday’s disturbance marks the second grid incident recorded in 2026. Nigeria’s power grid has faced repeated disruptions in recent years, with several collapses recorded in 2025, the most recent occurring on December 29.

The operator said efforts are ongoing to strengthen grid stability and minimise future disruptions.