I am with Npower, and I would like to voice a warning with all consumers concerning their bills being estimated before the price rises. The practice used by Npower and undoubtably all the big energy companies, is to underestimate your bills whilst you are still on the pre-price rise rates, this means that when your rates increase, the energy that you had already used (and should have been billed at a lower rate) would then be billed to you at the higher rate. I noticed this on my last bill and immediately called to give the accurate reading. The phone call lasted several minutes as the receptionist at Npower tried to persuade me to leave the bill as it was and not to worry about changing it as " you can have it added to your next bill, you don't need to worry about it now " I had to insist on him taking the correct reading. On recieving the new bill a few days later, they omitted to put the new electricity reading and only altered the more insignificant gas reading, meaning that the well underestimated electric reading stayed the same. I then rang them again, and it took a full 25 minutes to get them to re-issue a correct bill including the up to date electric reading. Their reason given for the wrong reading initially was that the meter was actually read by one of their own contractors. On being told that the contractors did not have a front door key to our house, therefore he could not have read the meter, the receptionist said " Oh, your meter is not on the outside of your house" then went away for a few minutes to speak to his supervisor leaving me on hold. On return to the phone, he apologised and said that it was " A clerical error " and told me that the bill would be updated and sent out in a couple of days. When the new bill arrived, it showed that there had been a shortfall of £48 on the electric. That meant that if I had not insisted on a correct reading for my bill, it would have made the shortfall increase to approx £60 with the new inreased rate. I would imagine that they are doing this to all customers bills, so beware and check your readings now !