Originally posted by UncleVanya Not a visible one. There is however a huge amount of water diverted to hydroelectric generation. I can't find numbers in % right now but I recall being told in 2015 that 1/2 of the water potentially able to flow over the falls was diverted during the day and 3/4 at night. But in reading about it more it appears that there are fixed numbers that must flow for on and off peak times.
Yes, when we lived in western Massachusetts, the monthly bill issued by our {village-owned} electricity utility specified the sources of power, because their rates depended on how much power came from where. IIRC, around 10% of our power was attributed to Niagara.