Kenneth E.F Watt has written:

'Taming the future' -- subject(s): Science, Study and teaching

there is one Giga Giga watt in one Exa watt. So one Exa watt = one Giga Giga watt or 109 Giga watt

or

one Exa watt = 1018 watt and one Giga watt = 109 watt

then

one Exa watt = 109 Giga watt

or

one Exa watt = one billion Giga watt = one thousand million Giga watt

James Watt discovered watt.

The homonym for "watt" is "what." In speech, the words "watt" and "what" sound the same but have different meanings.

not gega watt ,it is gaga watt ,

you have to start from

1 watt

1000 watt = 1 k watt

1000 000 = 1 mega watt

1000 000 000 = 1 gaga watt

example : your home need 5 k watt = 5000 watt ,

but this mega watt or gaga watt amount generated from huge turbine s ,to feeding cites needs in electricity demand .