When I was poor, on the bones of my arse poor, I had pre-payment meters. The power company would not let me switch because of my credit rating. We were always on emergency credit. It was extortionate. I hated it. The power went off routinely. I would have actual panic attacks over the thought of having to use the tumble dryer or turn the heating up.
We moved. My credit improved. We had pay monthly bills. It was bliss.
We moved again to a house with pre-payment meters. I intended on switching but in the chaos of moving and decorating never got around to it. In the end I realised these pre-payment meters were actually reasonable. I was spending around the same, if not slightly less, than I did when I was on pay monthly.
Fast forward two years and I got a new job. I am breathtakingly tired. I am out of the house for 13 hours a day, seven days a week. I've negelected the meters and ran into emergency credit a few times without noticing. I guess the kids pressed the 'activate emergency credit' button while I was out instead of going online on their phones and topping up the meters 
My bills have more than doubled. I am putting about £45-60 a week on the electric meter and £30 on the gas. I've noticed it goes down to the normal rate after a few weeks of staying out of emergency credit.
The power company swear blind they do not change my tariff. I conducted a test yesterday. I let the gas tick over to emergency and watched how long it took for me to use my fiver.
One night! In one single, solitary fucking night we used a fiver. When I went to bed at 9:30pm and turned the heating down to 15 degrees like I always do we had £3.43 credit. When I got up we'd used the whole lot and were £0.68p into family friendly credit. That is not normal, surely to christ that is not normal?
I've recently had my meters checked and my boiler serviced. There's nothing wrong there and when I keep on top of topping up the meters things are normal. We put around £20-25 a week on electric and £10-15 on gas.
I'm going to concentrate on getting into the routine of topping up once a week like I did back when I had days off but AIBU? Am I being crazy? Is there a power hungry leprechaun living under my stairs who feeds on gas and electric but can only emerge when I'm really busy?
I'm not the only person whose noticed. A colleague of mine, with a different supplier has also noticed her bills go up for a few weeks after using the emergency credit.