I am in Florida at the moment (coming back on Jan 25) but I believe this is pretty close to the truth. There is one rate for the first 500 kwh; From 500 - 900 the rate per kwh goes up a bit; Over 900 kwh and the rate is deadly. The last bill was for something like 1,072 kwh and the bill for the last 172 was more than for the first 900. Be careful but be cool. You can also take the meter out and put it in upside down and it will run backwards. LOL! We did this in our college days. The digital meters took this opportunity away.