In the national capital, air operations at IGI airport were affected again, a day after dense fog played havoc leading to delay and cancellation of several flights. Due to operational reasons, 12 domestic fights were cancelled and about 40 others delayed by upto three hours today. Airport sources said, 12 flights of SpiceJet, Jet Airways and Kingfisher airlines to Amritsar, Leh, Chandigarh, Mumbai, Srinagar and Kolkata were cancelled either due to bad weather condition at the destinations or other operational reasons.<br/><br/>The Met department at the airport said, the runway visibility was recorded at 2,000 metres for the main runway and at 1,600 metres for new runway in the morning. <br/><br/>AIR correspondent reports, over 200 flights were either delayed by up to five hours or rescheduled or diverted to various destinations yesterday when thick fog and a cable fault disrupted flight operations. Airlines are finding it difficult to maintain the schedule, which went haywire due to dense fog and glitch in the cable of runway visual range measuring instrument leading to a halt in air operations for over eight hours. <br/><br/>Meanwhile, passengers whose flights were cancelled or delayed thronged the reservation counters for alternative flights. They also complained about the alleged poor treatment from the airlines staff at the counters.<br/><br/>Dense fog and cold continue to disrupt normal life in several parts of north India. Three train accidents in Uttar Pradesh yesterday killed ten people and injured 40. Rail, road and air traffic continues to be affected in many parts. The railways have ordered an investigation into the accidents.<br/><br/>Large parts of North India, including Delhi, plunged back into darkness late last night as the regional electricity grid collapsed due to dense fog, hours after it was restored.<br/><br/>A senior official of Punjab State Electricity Board said in Chandigarh that the Northern grid has again collapsed, leading to disruption of power supply to all power plants in Punjab, Haryana and Chandigarh.<br/><br/>Several parts of the national capital also went without electricity late last night for the second time in a day following a major breakdown in the Northern grid.<br/><br/>A Delhi Transco official said the technical problem in the grid occurred at around 10 PM resulting in massive disruption of power supply.<br/><br/>Railway sources said, several long-distance trains, which left Delhi after 9.45 pm, were stranded in nearby areas due to lack of power supply.<br/><br/>Reports of power supply breakdown also came in from Jammu and Srinagar.<br/><br/>Earlier in the day, the fog led to the collapse of the the northern grid snapping power supply to vast tracts of north India, including Delhi.<br/><br/>AIR correspondent Nandini Mittal reports from Shimla that though it is cloudy in Shimla today but the temperature remains above the normal range in this time of the year. As per the metriological department there is little hope of snow due to absence of strong western disturbance. In fact, hopes of snow in the near future have been further dimmed with the temperatures rising after the Christmas. This can spell doom not just for the farmers but can cause acute drinking water scarcity in the summers.How ever Other hill stations of himachal like Manali, Dalhousie and even Dharamsala have had good snow this year but Shimla remains dry this winter despite low temperatures during the month of December. This year too hopes of a White Christmas or New Year were dashed as there was bright sunshine all along.