[1/3] Vehicle lights cause light streaks on the road along a market, during country-wide power breakdown in Karachi, Pakistan January 23, 2023. But the blackout in Pakistan on Monday was its second near-complete grid failure and the third in south Asia in three months. Grid operators attempt to keep the frequency of the grid stable at 50 hz, with deviations over 0.05 hz typically considered abnormal. "Transmission lines tripped, which resulted in isolation of north and south system," Akthar said in the note. About 11.35 gigawatts (GW) of power plants were in operation across the country when the transmission lines tripped and separated the northern and southern grid, the note read.

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