Megajoules to terawatt hours converter on this page calculates how many terawatt hours are in 'X' megajoules (where 'X' is the number of megajoules to convert to terawatt hours). In order to convert a value from megajoules to terawatt hours (from MJ to TWh) just type the number of MJ to be converted to TWh and then click on the 'convert' button.