A massive power breakdown across Pakistan continued after night fell on Monday, affecting most of the country's 220 million residents, including in the mega cities of Karachi and Lahore.
Pakistan's national power system is a complex and delicate web where problems can quickly cascade.
The breakdown was caused by a fault in the national grid at around 7:30 am (0230 GMT), plunging much of the country into darkness.
"We hope that the electricity will be restored throughout the country by tonight," Energy Minister Khurram Dastagir Khan said in a video statement.
The cut was caused by a variation in frequency on the national grid as power generation units were turned on early in the morning.