Maybe I'm atypical
In the east half of North Carolina the rates have been constant for over a decade, 9.5 cents/Kwh in the winter six months and 10.5 cents/Kwh in the summer. Easiest to think of it as a dime year round. (Eat your heart out, California.) These rates may change depending on whether Progress Energy (east half of state) is absorbed by Duke Power (west half) or not.
Maybe I'm atypical but I didn't have to look these numbers up. I've been aware of them for years.