Two points. As I mentioned, the finance department says that the cost is between $5 million and $40 million for every billion dollars invested. That's a pretty wide range, and I'm willing to bet it's near the higher end of that range.
As I mentioned, at the higher range, that would be about $1.5 billion over the last ten years that has been deferred. The Commissioner of the Environment and Sustainable Development said that it's a significant tax concession--not that it's money deferred, but that it's a tax concession and tax benefit.