This article by Griff Palmer in the NY Times Business Day section examines three P3 projects in the US, and compares the promises with some of the disappointments.  The article provides a good overview of the significant issues that must be considered in order for a P3 to be successful for all concerned.

https://www.nytimes.com/2016/12/24/business/dealbook/private-equity-water.html?emc=edit_ta_20161224&nlid=51116999&ref=cta&_r=0