MADRID, April 16 (Reuters) - Abu Dhabi state-owned TAQA is in talks with Spanish holding vehicle Criteria over a potential takeover of Spanish energy company Naturgy, newspaper Cinco Dias reported on Tuesday citing unidentified market sources.

ADPower, a unit of Abu Dhabi sovereign wealth fund ADQ, owns just over 90% of TAQA.

Criteria, which is the main shareholder in lender Caixabank , owns a 26.7% stake in Naturgy. Private equity investment funds GIP and CVC each own around a 20% stake.

Naturgy declined to comment.

Criteria was not immediately available for comment. (Reporting by Jesús Aguado, Pietro Lombardi, David Latona; Editing by Inti Landauro)