Terawatt hours to kilowatt hours conversion calculator above calculates how many kilowatt hours are in 'X' terawatt hours (where 'X' is the number of terawatt hours to convert to kilowatt hours). In order to convert a value from terawatt hours to kilowatt hours (from TWh to kWh) simply type the number of TWh to be converted to kWh and then click on the 'convert' button.