Revived or new form of green energy getting assessed (11)

'revived' is the definition.
(thesaurus)

'new form of green energy getting assessed' is the wordplay.
'new form of' indicates anagramming the letters.
'energy' becomes 'e' (physics symbol as in E=mc2).
'getting' means one lot of letters go next to another.
'assessed' becomes 'rated' (rating is a kind of assessing).
'green' with letters rearranged gives 'regen'.
'regen'+'e'+'rated'='REGENERATED'

'or' is the link.