America turned on new 400 yottawatt generator (3)

I believe the answer is:

sun

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'400 yottawatt generator' is the definition.
I can't judge whether this defines the answer.

'america turned on new' is the wordplay.
'america' becomes 'us' (United States).
'turned' says the letters should be written in reverse.
'on' says to put letters next to each other.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'us' written backwards gives 'su'.
'su'+'n'='SUN'

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(Other definitions for sun that I've seen before include "Star round which we orbit" , "Bask" , "It's sol in Latin" , "Our central star" , "Nice weather" .)

I've seen this clue in The Independent.

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