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Let me answer your second question first. The temperature of the water in a hydroelectric plant plays no part in the amount of power that the system generates. The water passes through turbines, with spin giant magnets around a coils of wire - the more flow of water ( the higher the pressure ) the more output from the turbine. The plant produces more electricity in the summer because that is the peak season for electricity usage!
As for the materials in the blades and, I would think that in more of an engineering question - but I will attempt to answer it, although I'm not sure my answer will be 100% accurate. To turn the shaft - the metal can be almost any cheap metal ( properly treated to prevent water corrosion - probably with a LOT of grease - Steel). The blades has to be much more delicate and stronger, then the steel shafts, and still be able to handle then extreme volume of all the water the is passing through them. They also has to be molded into a shape that pumps the water OUT from the mouth of the incoming water. I would say some alloy is used here, but then I have no idea what alloy it would be. The alloy would have to be stronger than steel so that the thinner blades to not warp or bend due to the pressure of the water over extended use.
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