A major power breakdown struck Karachi overnight, as a high-tension 500KV backup power line near Jamshoro tripped in the early hours of Friday, causing the most parts of the city to plunge into darkness, Aaj News reported. According to initial reports, the areas affected by the sudden power outage, are II Chundrigar Road, Saddar, Burns Road, North Karachi, New Karachi, Federal B. Area and Gulistan-e-Jauhar. The other affected areas are Nazimabad, North Nazimabad, Landhi, Korangi, Shadman Town, Buffer Zone, Malir, Shah Faisal Colony, Bahadurabad, Defence, Gulshan-e-Iqbal and Liaquatabad. According to the reports, the K-Electric said nearly 80 percent of Karachi is in the dark owing to the massive power outage.