The Nigerian Independent System Operator (NISO) has confirmed that nationwide power supply fell to 3,200 MW on Sunday, September 28, 2025, following industrial action by the Petroleum and Natural Gas Senior Staff Association of Nigeria (PENGASSAN).
The strike, which disrupted gas deliveries to power stations, slashed generation from over 4,300 MW earlier in the day to 3,200 MW at its lowest point.
In response, NISO said it swiftly deployed interventions to stabilize the National Grid, including:
Hydropower optimization: ramping up hydro stations to add more than 400 MW.
Load balancing: real-time dispatch adjustments to align generation with demand.
System support: deploying frequency and voltage stabilization tools to protect the grid.
Selective load shedding: used as a last resort to prevent a nationwide collapse.
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The operator assured that these measures preserved critical loads and averted a total blackout.
“The System Operator reaffirms its commitment to proactive grid management and operational excellence to guarantee secure and reliable electricity supply for the nation,” NISO said.
