I have solar so avoiding the increases so far, but I check on the rate increases from time to time just to feel good about my ROI. In California and quoting: The average per kilowatt hour rate for PG&E residents has been increasing by about 4% each year for an increase of 44% since 2008, while U.S. residential solar costs have been decreasing by an average of 12% every year.
It is a bit more complicated than that given tiered rates for levels of use, but it is somewhat useful information generally.