India's infrastructure push will require not only long-term financing but also a bigger pool of companies capable of executing large-scale projects, Rajkiran Rai, managing director and chief executive of National Bank for Financing Infrastructure and Development (NaBFID), said. In an interview with ET, Rai discusses the challenges related to land acquisition, project preparation, transmission infrastructure and aggressive bidding, while outlining NaBFID's role in financing sectors that are critical to India's infrastructure development. Edited excerpts: