In a message dated 12/4/2006 12:12:17 PM Central Standard Time, loteng at lvradio.com writes: Niagra Falls supplied 25 Hz power to Canada and parts of the USA (mostly > upstate NY) until the early 1950s. When the switch was made to 60 Hz, > the (((((((((((((((((((((((((( What did they do to change the frequency? Speed up the turbines or replace them? Dave