MADRID, June 29 (Reuters) - Acciona Energia is expected to set the price of its initial public offering at 26.73 euros per share, which would give the newly listed company a market value of around 8.8 billion euros ($10.48 billion), the bookrunners of the deal said on Tuesday. Acciona, the parent company of Acciona Energia, is offering offering up to 17.25% of its unit, including the over-allotment option, with books closing at 2 p.m. Madrid time on Tuesday. Acciona declined to comment on the price. $1 = 0.8400 euros Reporting by Arno Schuetze, Inti Landauro; editing by Jesús Aguado Our Standards: The Thomson Reuters Trust Principles.