The North American power grid runs at 60 Hz and the power companies traditionally have gone to great lengths to insure that the system stays at precisely 60 Hz. Many clocks and other devices use the 60 Hz frequency as the basis for maintaining accurate timekeeping functions, although in todays world, other more accurate time keeping strategies are used in electronic devices. The North American Electric Reliability Corp. is considering a test in which the frequency will be allowed to float in an effort to improve the reliability of the overall grid-
"A June 14 company presentation spelled out the potential effects of the change: East Coast clocks may run as much as 20 minutes fast over a year, but West Coast clocks are only likely to be off by 8 minutes. In Texas, it's only an expected speedup of 2 minutes.
Some parts of the grid, like in the East, tend to run faster than others. Errors add up. If the grid averages just over 60 cycles a second, clocks that rely on the grid will gain 14 seconds per day, according to the company's presentation."http://tinyurl.com/6gfgv58
Maybe a good excuse for being late to work?