Enel SpA (BIT:ENEL) confirmed that the infrastructure arm of Macquarie Group Limited (ASX:MQG) has submitted a binding offer of about €2.65 billion ($3.14 billion) for the Italian energy group's 50% holding in Open Fiber S.p.A. The bid, tabled by Macquarie Infrastructure & Real Assets (MIRA), excludes debt, but includes earnout, according to the filing which did not provide further financial details. The board of Enel acknowledged the proposal and said it will await "updates on the details that may emerge following the required in-depth activities with MIRA on the content of the offer." The bid was earlier reported to confer the broadband unit an enterprise value of between €7 billion and €8 billion. The bid comes as the Italian government has been making efforts to speed up the creation of a single broadband network operator in the country, by reportedly urging Telecom Italia and Enel to commit to accelerating talks on the merger of Telecom Italia's broadband services with Open Fiber.