Lagos residents and businesses may be heading into another difficult power stretch and blackout after a shutdown at Egbin Power Station, and a separate transmission fault disrupted electricity supply to the state.

The Nigerian Independent System Operator said the trouble started when Egbin, the largest electricity-generating plant connected to the national grid, suffered a major operational disturbance that wiped out its generation.

According to the operator, the plant’s output fell sharply from about 641 megawatts to zero at 8:21 p.m. on April 28.

The agency said the collapse in generation was caused by the failure of the plant’s central compressor and a malfunction in its circulating water pump system, forcing an emergency shutdown of all generating units to protect the facility.

“The Nigerian Independent System Operator wishes to inform the general public of a significant reduction in power generation currently affecting electricity supply across the country, particularly within the Lagos region,” the statement said.

But Egbin was only one side of the disruption.

Authorities also disclosed that electricity supply into Lagos had been further restricted by the forced outage of the Osogbo–Ikeja West 330kV transmission line, one of the most important routes used to move power into the state.

That double hit has created a serious supply gap, leaving system managers with little room to manoeuvre.

“Consequently, this loss of generation has created a significant supply shortfall, necessitating immediate load-shedding measures to maintain grid stability and prevent a wider system disturbance,” the operator added.

For consumers, that means more rationing, longer outages in some areas, and tighter supply while emergency recovery efforts continue.

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The system operator said contingency measures had already been activated, including redistribution of available electricity across distribution companies, with priority given to critical national infrastructure.

It also said efforts were ongoing to optimise generation from other available plants in order to soften the blow on homes, offices and factories.

Located in Ikorodu, Egbin Power Station remains one of the most strategic facilities in Nigeria’s electricity network. It has an installed capacity of more than 1,300MW, although actual generation often fluctuates because of gas supply shortages, maintenance challenges and wider grid constraints.

Whenever Egbin loses substantial output, Lagos is usually among the first places to feel the pressure because the state accounts for a large share of national electricity demand.

The Osogbo–Ikeja West transmission line is equally vital, serving as a backbone corridor that helps evacuate power from generation sources in other parts of the country into Lagos.

Energy experts have long argued that Nigeria’s grid lacks enough redundancy, meaning there are too few backup options when key assets fail.

In more resilient systems, one plant trip or one line outage should not create widespread disruption. In Nigeria, however, such incidents can quickly snowball into shortages, emergency load shedding and economic losses.

That is especially costly in Lagos, where thousands of businesses already rely on diesel generators and private power solutions to survive erratic public supply.

The Independent System Operator apologised to consumers, especially those in Lagos and neighbouring areas, assuring the public that relevant stakeholders were working to restore normal supply as quickly as possible.

Meiza Nigeria