We looked into it as I thought it would save us money. I don't think it does, all it really is, is a way for you to pay for your power as you use it. If you run out of credit you have no power, you get a day & then 1/2 a day warnings to when your power will be cut off.
You have to go to places that have the pre paid power cards so you can top up.
We did not go with it, the thought of going out in the rain to put more credit on the power so it would not be turned off while cooking was enough to put me off.
We changed power companies & get 12% off for paying on time & flybuys