" the main benefits of the bank will be expertise in structuring loan guarantees and moving long-term debt off of government books and onto private partners, in exchange for a negotiated rate of return."
Right - they'll move it of the government balance sheets and then, because things will look so rosy, they will increase government debt on other things. Meanwhile we'll be paying to use infrastructure that should be owned by the public. As the old saying goes there ain't no such thing as a free lunch.