Pakistan suffered a huge power cut early on Monday following a breakdown in its national grid, leaving millions of people without electricity.
Power was out in all major centres, including the biggest city, Karachi, and the capital, Islamabad, as well as Lahore and Peshawar.
Power minister Khurrum Dastagir said the grid failure followed a "frequency variation" in southern Pakistan.
Electricity had still not been restored in many areas as night fell.
Pakistan often suffers from power cuts, which are blamed on mismanagement and a lack of investment in infrastructure. The last major blackout in October took hours to restore.
The energy ministry said that at about 07:30 local time (02:30 GMT) the grid "experienced a loss of frequency, that caused a major breakdown", adding that "swift work" was taking place to revive the system.
Mr Dastagir insisted this was "not a major crisis" and said officials had begun restoring power across the country - but many homes and businesses remained without electricity more than 12 hours after the blackout began.
He told Geo TV that parts of the electricity were turned off overnight because the demand for energy during winter was less than in summer, when much of the country experiences very high temperatures and people use air conditioning and fans.
"In winter, the demand for electricity reduces nationwide, hence, as an economic measure, we temporarily close down our power generation systems at night," he said.
When they were turned on in the morning, "frequency variation and voltage fluctuation" were observed in southern Pakistan "somewhere between Dadu and Jamshoro" and subsequently "power generating units shut down one by one", he told the TV channel.
It meant that across the country, traffic lights went down, fans stopped and lights went off.
Rapid transit trains in Lahore - the driverless Orange Line metro - were suspended because of the power cut, transport officials told the BBC.
Many in Pakistan are used to dealing with fluctuating power supplies and load shedding - where electricity to some areas is temporarily reduced in order to prevent the failure of the entire system - is common.
Businesses, industries and homes often have their own generators which kick in when the electricity is cut. Airports operated normally on Monday because they have their own standby power systems, a spokesman for the Pakistan Civil Aviation Authority said.
Officials at Lady Reading Hospital in Peshawar, capital of Khyber Pakhtunkhwa province, told the BBC that hardly any department had been affected by the power cut because generators had been used to provide electricity.
However, while hospitals and larger industries may have bigger generators, other smaller organisations or private homes will not necessarily have enough power to last for many days.
Earlier this month, the government ordered all malls and markets to shut by 20:30 and restaurants by 22:00 under a new energy-saving plan.
The cabinet said that this was expected to save the country about 62bn Pakistani rupees ($270m; £220m). Federal departments have been told to reduce their electricity usage by 30%.
Pakistan generates most of its power using imported fossil fuels.
As global energy prices have increased in the last year, further pressure has been put on the country's finances and its foreign reserves which it needs to pay for energy imports.
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January 24, 2023 at 12:59AM
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Pakistan power cut: Major cities without electricity after grid breakdown - BBC
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