OK, this may not be urgent as I did phone and they agreed that it was wrong, but I'm worried that there's a problem that will return. I'd appreciate any advice in getting to the bottom of it. I'm with Scottish Hydro Electic. Not got any gas. I pay monthly by DD. £30 per month up to now and when I got my last bill I was almost £30 in credit which I got refunded. I tend to be about £20 in credit. I have storage heaters and have "Heating control energy" and standard energy. My storage heaters were switched off at the wall in March and haven't been on since. I live alone and I'm careful with electricity. Energy saving bulbs, go round switching things off, nothing on standby. I got a bill yesterday. Reading from 27/2 -31/8. They claimed I owed £235 and my DD needed to go up to £74. So I panicked and phoned them, did some readings and gave the serial numbers of my meters and the employee said it sounded right and went to speak to his manager whe he confirmed that I was now in credit which sounded right. My problem is that I can see this happening again because my readings weren't that different to theirs, just that they don't make sense. It's the heating control that's gone up. From 369 units to 4751 units. 4382 units compared to my standard energy which has increased by 667. So on my (cheaper) night time electricity I owe(d?) £264 compared to £90. I haven't even been using it! As I said earlier the storage heaters are switched off and I don't use power at night. Everything is switched off and unplugged. Except my fridge/freezer. But it's on in the day as well. Does anyone have any idea what the cause could be. I don't know a lot about electricity but this must be wrong. Help!!!!