Infrastructure funds are now dominant forces in the infrastructure finance ecosystem. But their needs - and those of their investors - are constantly evolving. On the eve of Proximo's debt event in Lisbon, the European Infrastructure and Renewables Finance Exchange, Tom Nelthorpe speaks with Bronte Somes, head of infrastructure equity, Europe, at UBS Asset Management, Alexander O'Rourke, principal at White Summit Capital, and Laurent Chatelin, managing director at the Marguerite Fund.