Pension fund AustralianSuper said on Thursday it intended to vote against Brookfield-consortium's "best and final" takeover offer for Origin Energy Ltd that valued the power producer at A$16.40 billion ($10.53 billion).

The consortium's sweetened offer of A$9.53 per share comes days after AustralianSuper, Origin's biggest shareholder, rejected the prior offer of A$8.81 apiece.

(This story has been refiled to fix a typo in paragraph 1)

(Reporting by Sameer Manekar in Bengaluru; Editing by Subhranshu Sahu)