The result of your conversion between gigawatt hour and zettajoule appears here
To convert between Gigawatt Hour and Zettajoule you have to do the following:
First divide 3.6e+12 / 1.0e+21 = 0.
Then multiply the amount of Gigawatt Hour you want to convert to Zettajoule, use the chart below to guide you.
Symbol: GWh
No description
Symbol: zJ
No description