Regular credit cards give about 0.4% back as points I think. Some higher credit cards like the Visa Infinite that I am on give double points on all purchases, therefore give 0.8% back. Other programs like asia miles etc might give different amouts, as PDLM points out.
The other thing to consider is that electricity, gas, water etc are not small purchases. Some summer month I can spend thousands on electricity.
So in other words, if I autopay my electricity bill I get nothing. But if I cancel the autopay and pay it online I get 0.8% back in the form of credit cards points. Ive tested and it works, at least with my bank (Standard Chartered). Not sure how all the others work.
I actually found out about this from a marketing brochure the bank sent me. It was not very clear, but made reference to being able to earn credit card points by paying bills online. It seemed strange to me that I could earn points this way, so I tried calling them for clarification. They had no clue what I was talking about. I tried to ask them why they reward me for paying my bills online, why am I being penalised for using autopay, why I cannot autopay from credit card, etc. But I gave up trying to get an answer from them and just tried it out. It works. I still dont understand it though.