Sigh... I have a pen, anyone have an envelope?
So the company's annual revenue should be in the ballpark of $65 M/yr.
The estimated cost to build the thing is $750M, and their estimated payback period is 11 years. That doesn't quite jive with the numbers I've come up with, and doesn't take into account net-present-value calculations, financing costs, operating expenses, etc. But, even so, you should certainly be able to pay for the thing over its many-decades-long lifetime.
If I had to guess, it's that they're adjusting the revenue (That 65M/yr) for inflation because it's not all going to be in today's money, but not the $750m, since that's going to be spent relatively quickly. This is entirely a guess - I don't know how businesses usually account for this - but it would close up the logical gap you're pointing out, without requiring fancy stuff.
This process can check if this value is zero, and if it is, it does something child-like. -- Forbes Burkowski, CS 454, University of Washington