## ››Convert gigawatt hour to zettawatthour

 gigawatt-hour zettawatthour

How many gigawatt-hour in 1 zettawatthour? The answer is 1000000000000.
We assume you are converting between gigawatt hour and zettawatthour.
You can view more details on each measurement unit:
gigawatt-hour or zettawatthour
The SI derived unit for energy is the joule.
1 joule is equal to 2.7777777777778E-13 gigawatt-hour, or 2.7777777777778E-25 zettawatthour.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between gigawatt hours and zettawatthour.
Type in your own numbers in the form to convert the units!

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## ››Definition: Zettawatthour

The SI prefix "zetta" represents a factor of 1021, or in exponential notation, 1E21.

So 1 zettawatthour = 1021 .

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