Hundreds of protestors clashed with police in riot gear near Mirpur city of PoK when they were prevented from marching towards Mangla hydropower station on the Jhelum river.
The protest was organised by the Mirpur Citizens Action Committee.
Footage on television showed policemen firing in the air and using teargas to disperse protestors.
Both sides hurled stones and rocks at each other as 30 people, including nine policemen, were injured.
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Media reports said parts of PoK had no power for 12 to 18 hours a day.
Residents of Islamabad have been hit by power cuts of 12 hours or more since last week while parts of the nearby garrison city of Rawalpindi had power for only four hours over the weekend.
The situation has been exacerbated by soaring summer temperatures, with many parts of Sindh reporting highs of over 40 degrees Celsius for the past fortnight.
On Friday, Lahore experienced its hottest day in 29 years as the temperature shot up to 47 degrees Celsius.
Finance Advisor Shahid Amjad Chaudhry said Rs 10 billion were being released by the Finance Ministry to the Power Ministry to buy fuel for thermal power plants.
Khoso directed officials to speedily complete formalities for connecting a new Turkish-built 56.4-MW wind power project at Jhimpir in Sindh to the national grid within 48 hours.
However, the caretaker government has largely failed in its efforts to address the energy crisis.
Most government departments have ignored Khoso's directive to switch off all air conditioners from May 15.
While state-run thermal plants have an installed capacity of 3,580 MW, they generated only 1,305 MW last week, according to a report in The Express Tribune.
Independent Power Plants across the country have a generation capacity of 7,687 MW but produced only 5,024 MW as most of them were closed due to lack of fuel.
Nine of the 26 independent power plants were closed over the weekend and many plants have no money to buy fuel as government departments and ministries have not paid their bills, resulting in huge "circular debts".
Hydropower plants are generating only a little more than 48 per cent of their installed capacity while thermal plants generated just one-third of their installed capacity.