A pre-dawn attack Saturday on a transmission tower in Baghlan province left Kabul with 95 megawatts, less than a quarter of its normal power supply, said Wahid Tawhidi, a spokesman for power utility Da Afghanistan Breshna Sherkat (DABS).
Efforts to repair the pylon had so far failed as heavy fighting prevented a local DABS crew from reaching the site, Tawhidi told AFP.
"Today when our team tried to go to the area, rockets were fired at their vehicles and they had to turn back," he said.
"They have escaped the area but some of them are still in the mountains, preventing engineers from fixing the pylon," Haqmal told AFP.
This is the fourth outage in recent weeks caused by militant attacks on the power line transmitting electricity from Uzbekistan and Tajikistan. It has also affected neighbouring Nangarhar and Parwan provinces, Tawhidi said.
Residents in Kabul have been forced to make do with just an hour of electricity a day, sparking a firestorm of complaints on social media.
Another Facebook user, Shabnam Khurasani, posted: "Power cuts in Kabul are intolerable." The bulk of Afghanistan's electricity comes from neighbouring countries but the amount is insufficient to meet demand.
Residents in the Afghan capital are used to power shortages during the colder months when usage is higher, but supply is normally more plentiful in spring and summer.
Many people have diesel generators to provide backup power to their homes and businesses. Others go without, relying on battery-powered torches for light and drums of water to bathe and flush toilets.
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