According to the radio, the near-complete power outage in major cities happened due to a sudden drop of frequency in the national grid from 50 to zero.
Speaking at a briefing, the minister blamed the breakdown on the outdated transmission system, which he says had seen no upgrade for years. He noted that a comprehensive plan was being pursued to revamp the system.
The massive power outage hit the Asian country on Saturday, plunging the whole of Pakistan into darkness. The electricity went out in most cities, including the capital of Islamabad and the nation's biggest city, Karachi.
Pakistanis have shared photos and videos depicting dark cities on social media.