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