Secretary Water and Power Younis Daga and Chairman National Electric Power Regulatory Authority (Nepra) Tariq Sadozai on Saturday paid a visit to K-Electric office in Karachi to investigate the reason behind prolonged electricity outage in the metropolis. According to the details, the officials interrogated from the concerned department regarding the continuous load shedding during their visit and also inspected different activities in the office. The Ministry has also formed a four-member committee to probe into the matter.