I really did not have any problem with APS until the very end when I sold my house, then APS decided to show how they really run their business.
I had signed up for the equalizer plan in 2013, and was paying just over $100 a month for my power through APS. I sold my house in August 2013, called APS and told them to turn off the power on August 30 2013, then figured I would pay my last $100 bill and all would be good. Then APS sent me a bill for $450.
I called to question the bill and was told that due to signing up for the equalizer plan, the total amount of power that I actually used that month (which was over the $100) would now be due in full ($450). I then asked what the purpose of the equalizer plan was, since obviously it doesnt save you any money if you end up owing the full amount of your bill anyways once you move. The woman told me that the purpose of the equalizer was only to "let you know what your bill is going to be every month".
I suppose I could have done better research here, but I am extremely unhappy with APS springing a bill on me at the last second that is more than triple the amount I signed up for when I decided to use the equalizer plan.
Bottom line, the equalizer plan makes APS money, it does not save you any money. I would not advise using this plan unless you want a larger bill than expected once you decide to move.