Glad you asked...
The most common method to slow down the electric meter is to use a magnet to slow down or stop the rotating metal disc. However doing these kinds of activities may be recognized by electric company and in some countries doing so is an illegal activity. Information and video example http://system-review.blogspot.com/2008/0...
Then again, this answer might help you...
The way to slow down your electric meter is to turn off any lights you're not using, turn your a/c or heat thermostat warmer or cooler, and turn your electric water heater down a little. Those methods can make quite a difference.

