OECD published two major reports in 2006 and 2007. One "Infrastructure to 2030:Telecom, Land Transport, Water and Electricity" was a wideranging overview about the prospects for private investments in infrastructure sectors to 2030; the other ""Infrastructure to 2030: Mapping Policy for Electricity, Water and Transport" was a specific review of policy-making in relation to this. they can both be downloaded from:
http://www.oecd.org/document/60/0,3343,en_2649_36240452_36964924_1_1_1_1,00.html
The OECD does not mention at all on its website that these reports were actually sponsored by Macquarie Bank, which runs the largest set of infrastructure investments in the world. Macquarie's own website however provides the link to the OECd site under the text: "Macquarie-sponsored OECD report on global infrastructure needs"