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