Grid collapse: TCN in four-hour power restoration battle

On Wednesday afternoon, power generation on the national grid fell to as low as 10 megawatts, but after a four-hour intervention by the Transmission Company of Nigeria, it rose to 4,123.8MW on Thursday morning.

According to industry estimates spotted on Thursday, power on the grid dropped from a peak of 4,270.5MW to 10MW on Wednesday.

After TCN engineers worked on the system, the grid lost 3,489.1MW, or 99.71 percent of its capacity, but it was up to 4,123.8MW at 6 a.m. on Thursday.

Ndidi Mbah, TCN’s General Manager of Public Affairs, said on Thursday that the grid was fully restored at 4:59 p.m. on Wednesday, following the collapse that happened about 12:20 p.m. the same day.

She said the collapse was triggered by a sudden drop in system frequency to 47.21Hz.

“Reports received from SCADA (Supervisory Control and Data Acquisition) and other power generating stations showed that at about 12:20pm two generating units tripped in one generating station, while four equally tripped in another generating station,” she said.

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This, according to Mbah, caused a loss of 261MW and 350MW respectively, bringing the total loss of electricity on the grid to 611MW.

“It is suspected that the sudden loss of 611MW from the grid caused system instability and its eventual collapse,” she stated.

The TCN spokesperson, however, stated that after the collapse, the company’s system operators commenced the restoration of the grid by 12:46pm.

She said power supply in Abuja was fully restored from Shiroro generating station at 1:05pm, adding that the firm equally commenced grid restoration from the Delta power station and at 4:59pm a full restoration of the entire grid was achieved.

Mbah expressed appreciation to the government, electricity customers nationwide, and international customers for their patience.

She added that the TCN would continue to work hard to expand and maintain the stability of the national grid.

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