The Nigerian Independent System Operator (NISO) has disclosed shortfall in power generation following interruption in gas supply due to the ongoing strike embarked by Petroleum and Natural Gas Senior Staff Association of Nigeria (PENGASSAN).
NISO cited that power generation was reduced to as low as about 3,200 MW at the lowest point.
According to NISO management in a statement at the early hours of Tuesday, “These disruptions triggered widespread gas shortages, reducing available generation from over 4,300 MW in the early hours of Sunday, 28th September 2025, to about 3,200 MW at the lowest point.
In response, NISO explained that it promptly deployed contingency measures to preserve the stability, security, and reliability of the National Grid.
NISO listed some of the key interventions which the organization put in place including : Hydropower Optimization, Generation Dispatch and Load Balancing, and Demand-Side Management.
The system operator maintained that these timely actions enabled the NISO NCC to minimize the impact of the labour-induced gas shortages, sustain operational security, and maintain supply to critical loads, thereby averting a nationwide blackout.
It explained the measures taken thus: “Hydropower Optimization: Strategic ramp-ups from major hydro stations, contributing over 400 MW of additional output to cushion the shortfall from gas-fired plants.
“Generation Dispatch and Load Balancing: Real-time load adjustments to match available generation with system demand, while preventing a system frequency collapse.
“Voltage and Frequency Support: Continuous deployment of reactive power compensation and reserve monitoring to safeguard system integrity.
“Demand-Side Management: Selective load shedding, applied as a last resort, to avert a system-wide collapse and ensure fair power distribution.
The System Operator reaffirmed its commitment to proactive grid management, operational excellence, and the application of best-in-class practices to guarantee a secure and reliable electricity supply for the nation.