The entire Garhwal division comprising seven districts plunged into darkness after technical snags erupted on the 400 KV Muzaffarnagar-Puhana transmission lines early morning at 6.15 am here today. The state had to surrender procured electricity due to breakdown of transmission lines.Uttarakhand Power Corporation Limited (UPCL) officials claimed that the supply of electricity was resumed to most of the localities at 8 am except in those colonies where testing of lines continued till late afternoon.The office-goers and schoolchildren had tough time to get ready to go to offices and schools in the absence of electricity.According to the information available, the insulator of 400 KV Muzaffarnagar-Puhana transmission lines broke early morning.Officials said that technical snags were reported due to extremely cold weather conditions, which always have an adverse affect on transmission and distribution system of power supply.UPCL Director (Operations) GK Sharma along with field staff reached at the state load dispatch centre(SLDC) and electricity supply was resumed in Rishikesh and Dehradun through Moradabad-Kashipur transmission line. UPCL officials told that the department had worked laboriously to resume electricity in the affected areas.