"My question is these turbine blades could last for fifty years and almost never have to be replaced .I dont know how many are already setup in Ontario but there is a lot of them ,how many do we need. I feel that who ever is building these blades now will soon have the market oversupplied and Samsung will not be interested in expanding to Ontario "

Really? Do you have any idea how much energy is needed around the world? There is no expectation that green energy can keep up with world demand. With the growing economies, yes growing economies, the demand for energy will outpace all green efforts for a very long time. Oil is not leaving any time soon...unfortunately and nuclear takes a very long time to put into place. To say nothing of the fact that we need to upgrade/replace existing energy supplies for obvious reasons.