Gurugram, May 3 -- A prolonged power blackout hit a major part of Gurugram early on Friday morning after unprecedented heavy rains and thunderstorm - two prime substations of the major transmission company Haryana Vidyut Prasaran Nigam Limited ( HVPNL) faced outages, causing inconvenience to thousands of residents. Electricity department officials said that the outages at the substations were followed by widespread faults in discom feeders and transformers of power distributor Dakshin Haryana Bijli Vitran Nigam Limited (DHBVN) which aggravated the situation. At the time of going to print, power was restored almost everywhere in the city and DHBVN teams were working to resolve the situation in a few areas where locals faults were causing the outages. Areas such as DLF Phase-I, II and III, Sector 15 and Civil Lines faced at least 12-hour long power outages before the electricity was restored. Residents in Sector 23A faced a six-hour long outage after the supply line was disrupted by uprooted trees at two places. Prince Arora, a Sector 15 Part-II resident, said inverters, mobile phone and even laptop batteries got discharged by the afternoon. "Several offices in the area were also affected as no work could take place due to the outage," he said. Bhawani Shankar Tripathi, a Sector 23A resident, said the power outage took place at 4.30am and it was restored post 10am. "Trees at two locations were uprooted, damaging the overhead feeders," he said. Akshay Jain, a DLF Phase-I resident, said while some of the areas faced continuous outage lasting for up to 12 hours, other areas faced intermittent outage. "Just one spell of heavy rain and thunderstorm exposed all the preparations of the discom. Linemen and workers took hours to arrive at the fault location as the same team was working in different areas," he said, adding residents had to purchase water bottles as routine supply could not take place. Officials said that more than 170 feeders across entire Gurugram district faced outages followed by malfunctioning of up to 28 high and low-capacity transformers and 233 broken poles which were either replaced or fixed. In some areas, power supply got snapped after trees were uprooted or branches fell on the electrical poles or transmission lines leaving them damaged. Shyambir Saini, DHBVN superintendent engineer, circle-I, said they faced hefty losses due to damages caused to the power infrastructure in Gurugram. Manoj Yadav, DHBVN superintendent engineer, circle-II, said that about 80 feeders developed faults, 48 electrical poles broke and five transformers were damaged....