Japanese utility Kansai Electric Power Company has signed up to buy an additional 500,000 tonnes per annum of LNG from Qatargas.The outfit said the contract will run for 15 years from January 2013 with supplies to come from Qatargas 3.Kansai already has a 23-year contract with Qatar for 290,000 tpa which runs into 2021.Qatar recently revealed it would send extra short-term LNG supplies to Japan to help fill the void left by the nuclear shutdown.