The result of your conversion between terawatthour and gigajoule appears here
To convert between Terawatthour and Gigajoule you have to do the following:
First divide 3.6e+15 / 1.0e+09 = 3600000.
Then multiply the amount of Terawatthour you want to convert to Gigajoule, use the chart below to guide you.
Symbol: TWh
No description
Symbol: GJ
No description