We knew this house had a prepayment electric meter. It was with EDF and, as they were the supplier in our previous home, I phoned them and asked them to put in a proper credit meter, which they did within two weeks. I also asked them to transfer the gas from British Gas to themselves, without realising that that meter was also a prepayment one, so the replacement process is rather more convoluted.
The gas meter had a £57 debt on it, and when I put my card in, with its £30 of credit, I only got £3’s worth of gas; I was horrified. Long conversations with BG later, I found that if I paid off all the debt, so the meter was clear, they would refund it all; we’re very lucky we could afford to do that – many folk couldn’t.
Also, it was costing about £4 *per day* to run the central heating for a few hours, and deliver hot water (two showers and three lots of washing up daily – cooking is all electric here). Truly, those who have nothing, have to pay more. Quite outrageous that prepayment gas and electric should be so much more expensive than metered.
However … the weeks we spent having to pay in advance (and through the nose) made us extremely aware of how much it was costing, and we have become far more frugal and careful in our use of power, which is no bad thing, I suppose.