 Infrastructure fund Macquarie has made an offer to buy all or part of Enels 50 stake in its broadband joint venture Open Fiber in a move that could help speed up the creation of a single Italian network operator. The Italian government sees building ultra-fast broadband as a priority and has called on former phone monopoly Telecom Italia TIM and Open Fiber to reach an accord quickly on creating a single network. TIM has been in talks for months over a merger of its fibre network assets with those of Open Fiber, but differences over issues such as governance and regulation have thwarted efforts. 