At least one person was killed and eight wounded in the northwestern province of Khyber Pakhtunkhwa after police opened fire on hundreds of people protesting at the cuts by trying to set a power station ablaze, officials said.
"The protesters first tried to torch the electricity power station and then they attacked a police station," Zafar Ali Shah, a senior government official in Malakand district, told AFP, adding that the demonstrators also attacked government buildings, offices and vehicles.
In the provincial capital Peshawar some 800 protesters took over two power stations, demanding government employees continue the electricity supply without interruption.
Pakistan has for years been struggling to provide enough power for its nearly 200 million citizens. Its chronic energy crisis sees daily power outages which are amplified in the summer heat.
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Residents in Peshawar said they face cuts for six to eight hours a day, while rural areas can receive electricity for as little as three to four hours a day.
Today he said that "minimum load-shedding" should be carried out during Ramadan, during which millions of devout Pakistanis abstain from food and drink from sunrise to sunset.
Temperatures in Pakistan touched near-record highs over the weekend.
Yesterday angry residents burned tyres in the roads in the sweltering port city of Karachi after a massive power outage in southern Pakistan.
Water distribution -- already unreliable in the megacity of some 25 million people -- is reliant on the electricity supply, leaving thousands unable to drink, cook or wash ahead of the first day of fasting.