A technical fault at the Bin Qasim power plant pushed a large part of Karachi into darkness on Tuesday night.
The most severely affected areas were the Super Highway, Shah Faisal, Shahrah-e-Faisal, Defence, Gulshan-e-Iqbal, Nursery, PECHS, New Karachi, Clifton, Landhi, Korangi and Nazimabad areas of Karachi.
A spokesperson from the main electric power provider of Karachi, K-electric, said that two facilities at the Bin Qasim Power Plant 1 had technical problems, which hindered the distribution of electricity to receivers.
"The breakdown has been caused due to faults in two units in the Bin Qasim power plants," said Usama Qureshi, a spokesman for K-Electric.
As the engineers from K-electric were working to restore of the system, officials avoided giving a specific deadline for the resumption of electricity services.
The major power breakdown affected the people of Karachi badly, interrupting its water supply. Residents of the city spent their night awake due to warm and humid weather conditions.
Business centres and shopping malls were plunged into darkness,and clients slogged away leaving the shopping malls, according to Pakistani media.
Electricity cuts, water shortages and a heatwave plagued Pakistan during the Muslim holy month of Ramadan as people fast as part of their religious duties.