We moved to npower last January after a disastrous time with another of the big5. All went well and we received a bill in April showing we owed some money which didn't alarm me as it was the winter quarter . However that was our only bill until I got in touch with them for the ridiculous amounts our usage against others was showing and the astronomical amount they were asking for future direct debits. I can't praise their staff in billing enough. A complaint was issued and after talking for a while it emerged they thought we had an old meter and not a new one which measures gas differently so hence the outrageous amounts we owed! Another person rang me the next day and by the end of that day; after several phone calls from our complaint overseer; our account was sorted and they actually owed us a refund which hopefully will be in our bank by the end of the week. 5 out of 5 for speed in resolving the problem 1 star deducted for the worker who failed to see our meter was measured in cubic metres when he initially surveyed them.