Tons of oil equivalent to gigawatt hours conversion calculator above calculates how many gigawatt hours are in 'X' tons of oil equivalent (where 'X' is the number of tons of oil equivalent to convert to gigawatt hours). In order to convert a value from tons of oil equivalent to gigawatt hours (from TOE to GWh) just type the number of TOE to be converted to GWh and then click on the 'convert' button.