I believe mine is bound to get cheaper - my contract with the utility is for 100% wind power electricity. That doesn't mean that my electricity comes directly from wind power plants, but it does mean that my electricity bill follows the fluctuations of the price of wind-generated electrical energy. In fact, I have been paying less and less in the last 5 years, but never by an appreciable amount. I hope for the best, once the wind power plants get expanded.
For the record, I didn't do it to save money but to save the world. Call me an idealist.