The Nigeria Independent System Operator, NISO has confirmed that the National Grid experienced a system disturbance at 14:01 hours on Monday, 29 December 2025 that led to a partial collapse.
The System Operator explained that preliminary reports indicate that the disturbance involved the tripping of several generating units and critical 330kV transmission lines, resulting in a widespread impact on electricity supply across parts of the country.
The national grid collapse was first reported by the Abuja Electricity Distribution Company, AEDC and Ikeja Electricity Distribution Company, KEDC, which lost significant power supply across their networks.
Recall that the Lagos–Escravos gas pipeline was vandalised on 10 December 2025, which led to the shortage in power generation in the country.
This has further led to the fragility and weakness of the national grid.
However, NISO said the Delta generation complex successfully operated on island mode at the 132kV sub-transmission voltage level.
This enabled the continued supply of electricity to Oghara, Amukpe, Benin, and Efunrun 132kV substations, with a total generation of 114 megawatts from four units at the Delta Thermal power station.
