What if you turned all of Quebec into a giant lake? Is there an environmental cost? This seems to be the question of the day. The cost of the project is quoted at merely the construction cost $8 billion for 1500 MW, the price of a nuclear station (done right!). How much are they leaving out in externalities? The loss of land, increased mercury, etc.
So really, how 'green' is all this, considering they are killing the 'green' and replacing it with blue. There's probably a big carbon cost, since bogs are great at capturing carbon. My own feeling is that if we put a carbon tax on this, and captured other externalities, the cost would be two or three times the base cost.