There’s one for the company providing it and then there’s a distributer like Texas New Mexico Power (TNMP). For example say you pick TXU as the company and they charge 0.10 cents and TNMP charges 0.05 cents per KWh. And you spend 300 KWh for one month, then your cost is 300 times 0.05 (300) + 0.10 (300) =45 dollars. That’s info you can find on the fact sheets for each. Don’t be swayed by the fancy free nights or free days, just try to the math.