Officials blamed the phenomenon on technical problems at a major power plant in southwestern Balochistan province.
A privately run 1,200 MW thermal power plant of the Hub Power Company (HUBCO) in southwestern Balochistan province developed a fault and stopped generating electricity last night. Islamabad Electric Supply Company CEO Javed Parvez said the load was transferred to the Mangla and Tarbela hydropower projects but they tripped.
The Mangla and Tarbela power projects had resumed generating electricity and efforts were being made to restore the supply of power to cities in phases, Parvez said.
According to news channels, the outage affected almost 70% of the country.