After getting a new electricity meter fitted I have received a shocking bill I was wondering if anyone could give me some help and advice. On 17/05/13 a new single-phase digital meter was fitted replacing an old analogue meter in the communal hall of the Maisonette I live in. ‘Lowri Beck Services’ have been trying to replace it for years, over that time missing a couple of arranged appointments! Checking my records I have found that the last actual meter read NPower undertook was on 11/02/11 at 36903KWh and the last read I undertook was on 5/10/11 at 38480 KWh. The reading taken upon fitting the new meter on 17/05/13 was 52842 KWh. I have therefore taken the spread of excess KWh owed as the difference between the last actual NPower reading date (11/02/11) and the date of the meter change (17/05/13 ). In order to work out the cost am I right in assuming the excess units should be spread out over this period? The last bill I paid was £149 up to 42372 Kwh estimated used, date 19/02/13. Therefore I work out the excess units as follows: 52842 – 42372 = 15939 KWh over 27 months (17/05/13 – 11/02/11) . The next bill I received was £1562.62 for the excess units generated by changing the meter, estimated meter readings and dates of 41843Kwh 07/02/12 until 52842Kwh 16/05/13 therefore: 52842 – 41843 = 10999Kwh over 15 months (16/05/13 - 07/02/12) I don’t know why they have taken the estimated excess start date as 07/02/12 rather than the last actual read on 11/02/11 or my read on the 05/10/11. I also don’t know why NPower used the meter reading 41843Kwh as the start of the excess Kwh rather than the meter read of 42372 Kwh that I have already paid up to, an overcharge of 305Kwh. Am I eligible for the 12 month back-billing restriction? Would this be taken as 12 months prior to the bill for the excess units of £1562.62 (which was reversed) or from the last bill I have actually been asked to pay, rather than been reversed (I still haven’t received one as yet!)? Answers to the above questions would be really useful and any help in how I go about structuring a response to NPower would be gratefully appreciated. Ps any advice as to where to address letters would be great, my account is currently under review by the complaints team due to informing NPower of the problems via telephone.