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I dont see how a private entity could deliver the same project cheaper than the city could.
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To save money the P3 has to be set up very carefully. Basically having the city design a project then tendering to a P3 partnership isn't going to save much if any money.
To really save money you have to be like how the Canada Line was planned. It was tendered as 'we need a line that travels this corridor, with stations at approximately these locations, that can carry this many people an hour, that can make the trip in this amount of time, and it has to be automated'.
With those factors the bidders were able to propose their different answers to the
optimization problem. You could build Sky Train with its lighter vehicles and lower diameter tunnels but longer stations, or something else with shorter stations, higher diameter tunnels, and heavier vehicles. You could build massive stations designed to handle a long train every 10 minutes, or small stations to handle a train every 2 minutes.
It is very hard to figure out which costs less, especially when a traditional bid doesn't internalize the operating and maintenance costs to the bidder. When a P3 includes operating costs you might end up with a situation like Vancouver where the company decided it was cheaper to cut and cover a portion that was initially to be trenched, because it would save maintenance costs and improve reliability over time.
Also, because P3 partnerships need to turn over the projects in a state of good repair after 30 years, you ensure that the builders don't initially cut corners that would raise maintenance costs.
In the end, it is hard to get politicians to give up the amount of control needed to make P3s work. They have to give initial approval to a project that they have no idea what it will look like, that is just amorphous statistics.