If tax credits and rebates are what make wind profitable.
Lots of industries start with various forms of government subsidy. The mistake made in ontario was thinking that the price of wind turbines was going to remain as high as it was for a lot longer.
The government was trying to convince the public that wind generators weren't going to destroy property values, deafen children etc. They were willing to take a loss on this up front in the hopes that by the time generation came down in price people wouldn't put up a huge protest about it. Unfortunately for the government, the price came down far faster than anyone anticipated, which is good for basically everyone else.
Had they stayed hugely expensive the government would be basically subsidizing half a dozen wind turbines here and there to show off, which, on the scale of things costs basically nothing, and if it made it easier to convince people to install a few thousand of them 20 years from now so much the better. But the price came down much faster than they anticipated.