I've never done anything in the energy industry, nor that is at this magnitude, but every construction project I've been involved with has paid its bills on a draw, out of the construction loan - not a cash account (the project owner doesn't typically "touch" the money; the bank distributes the draw to the contractors/subs). New owners of a facility don't typically get a loan for equity, unless that equity belongs to someone(s) else.
It could be for initial operating cash, but that is a pretty steep amount, IMO. $72.5M is about 1-year's worth of gross income ($1.3B over 20 years = $65M/yr).
What's also interesting/curious to me is that there was a lot of discussion about the construction price jumping from $175M to $275M in such a short time. It appears that it has jumped from $175M to $200M.