June 25 (Reuters) - Australia's Macquarie Group said on Tuesday its European infrastructure fund will sell its 40% stake in Italian energy firm Hydro Dolomiti Energia to a consortium for an implied valuation of about 1 billion euros ($1.07 billion). ($1 = 0.9321 euros) (Reporting by Sneha Kumar in Bengaluru; Editing by Rashmi Aich)