The Nigerian Independent System Operator (NISO) says Friday’s national grid collapse was caused by a system-wide disturbance triggered by the tripping of multiple 330kV transmission lines and the disconnection of some generating units.
NISO data showed load allocation to 11 electricity
distribution companies dropped to zero megawatts (MW) at 1 pm, marking the
first grid collapse of 2026.
In a statement following the incident, the operator said
power generation dropped to zero MW at about 12:40 pm, resulting in a total
outage across the interconnected network.
“Preliminary operational reports indicate that the
disturbance was associated with the simultaneous tripping of multiple 330kV
transmission lines, alongside the disconnection of some grid-connected
generating units,” the operator said.
“These events collectively contributed to the system
collapse at the time indicated.”
The operator said power restoration is underway, with
electricity supply already restored to key cities, including Abuja and Lagos,
following the grid collapse.
“Following the outage, system restoration activities
commenced at about 13:15 hours, in accordance with established grid restoration
and recovery procedures,” NISO said.
“As of the time of this update, electricity supply has been
successfully restored to Abuja, Osogbo, Benin, Onitsha, Sakete, Jebba, Kainji,
Shiroro, and parts of Lagos, while restoration efforts are continuing
progressively in other parts of the country.”
NISO added that a detailed investigation into the causes of
the grid collapse is ongoing, with full restoration and stabilisation of the
grid remaining a top priority.
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