Are you indicating one large power generating station for Canada on either the east or west coast would be preferable to what we have now? Or maybe place it on Hudson's Bay in a more central location?
You have been noted for making comments on varying power demands have you not? Flexibility and separation may be beneficial in the long run. Sure make the required shutdowns easier and aid when natural disasters occure.
More power generating sources give the distribution system much more flexibility. Remember Quebec's ice storm or some of the total grid shutdowns?? If'n all you got is one horse and it up and dies your just plain looking at the proverbial paddle and creek! Being able to easily diversify can be very beneficial.