worth having a look at., page-43

I can not fault your math, however you are using a retail price for the gas of $7.50 Gj where as the advisers Grant Samuels use a price of $0.45 a Gj as the gas is still in the ground, plus other factors time value of money before it is extracted and risk that it wont be extracted due to all the black swans that keep landing around those parts.
WHats really needed is a gas turbine power plant close by to take the gas during the summer months to.