I would love to have concrete data, but unfortunately it's all kept secret. We have to rely on auditors general to review this. The office of the Ontario auditor general reviewed 74 public-private partnerships that were through Infrastructure Ontario and found that they cost $8 billion more than if they had been publicly financed and operated. That works out to about 29% more and the auditor general found absolutely no evidence of risk transfer.
The previous government passed the Federal Accountability Act which actually reduced the transparency for public-private partnerships.