My local electric provider offers a power plan called flatbill where they will give you the same price for a whole year. Seems great right? Not so much. They offered me a monthly rate of $154 which i knew right away was way overpriced as i almost always pay more than what i owe to build up a credit in case something comes up and i cant pay it. So i keep a very sharp eye on my usage. I did the math and found out that my average power bill over the last year was $113 per month. I always pay $130 to build the credit and they wanted to charge me $154. Na, im good. I will handle it myself.
I averaged my own bills together and paid 110% of that amount January-November. Doing this gave me extra Christmas money as I often owed little or no bill for December.
The trick is to arrange it so that you're never under $0 in your balance, which worked for electric because my electric bills were higher in the summer than in the winter.
That's actually terrible advice. If your bill (all numbers examples) was $125 and you spend $150 to build up a credit with the company, you are essentially giving the company a free loan of $25 per month, and telling them "here, invest this for me, and keep the profits." You can put the same amount in a high interest savings account, only use it to pay for electrical emergencies, and just pocket the interest as profit. Functionally identical but you get the profit instead of the electric company.