Nigeria Power Grid Nationwide Supply Dips as Major Maintenance Hits Thermal Plants

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The Nigerian Independent System Operator (NISO) issued a critical alert today, February 12, 2026, warning of a significant 935 megawatt (MW) reduction in electricity generation across the national grid. 

This drop represents a nearly 20% cut from the country's current available capacity of approximately 4,753 MW. 

The shortfall is the result of a coordinated four day maintenance shutdown of a major gas supply facility operated by Seplat Energy Plc, a key joint venture partner of the Nigerian National Petroleum Company Limited NNPC Ltd. 

According to NISO’s formal statement, the maintenance exercise is scheduled to run from February 12 through February 15, 2026. During this window, the reduced gas flow into the NNPC Gas Infrastructure Company NGIC pipeline network will directly impact several of Nigeria’s most critical thermal power stations. 

Major plants including Egbin, Azura, Sapele, and Transcorp are expected to see immediate output constraints, while other stations like Olorunsogo and Omotosho may face indirect balancing effects as the system operator tries to manage the gas deficit.

The timing of this maintenance is particularly sensitive, as the national grid has already suffered two partial collapses earlier this year, in late January. To prevent a total system failure during this period, NISO has activated emergency load management protocols. 

While widespread blackouts are a concern, the operator has pledged to prioritize critical national infrastructure, ensuring that hospitals, security installations, and essential public services maintain a steady supply even as residential and industrial sectors face rotational cuts.

In an effort to bridge the energy gap, NNPC Gas Marketing Limited has reportedly begun engaging alternative gas suppliers to mitigate the impact. However, with gas fired stations accounting for over 80% of Nigeria’s total electricity generation, the margin for error remains thin. 

Distribution companies DisCos across the country have already started notifying customers of reduced power allocations, advising households and businesses to prepare for intermittent outages until the maintenance is finalized.

Full gas supply is officially expected to be restored on February 16, 2026, at which point the affected thermal plants will begin ramping back up to normal operations. 

NISO and NNPC have emphasized that this routine maintenance is an essential asset integrity protocol designed to prevent the kind of unplanned, long term infrastructure failures that have historically plagued the Nigerian power sector. For now, the nation remains in a state of monitored stability as engineers work to conclude the repairs on schedule.


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