## ››Convert kilowatt hour to zettawatthour

 kWh zettawatthour

How many kWh in 1 zettawatthour? The answer is 1.0E+18.
We assume you are converting between kilowatt hour and zettawatthour.
You can view more details on each measurement unit:
kWh or zettawatthour
The SI derived unit for energy is the joule.
1 joule is equal to 2.7777777777778E-7 kWh, 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 kilowatt hours and zettawatthour.
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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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