[jambutty]

Originally Posted by MargaretR

When a price rise happens, your supplier estimates/guesses how much was at the old rate and how much is at the new rate, in the quarter being billed.
The way to avoid this guesswork is to be on an online tariff, whereby you can read your meters on the day of the price increase and submit them.

(The meter reader calls occasionally, just to check that the figures you are supplying are true and not under recorded)

But that wasn’t the point of my post. I wasn’t against the ‘guesswork’ involved in determining how much was at the old price rate and how much was at the new rate. The energy suppliers have a special formula for working that out and in general they are not too far off.

My point was that the customer did not know how the “Primary” units was calculated and their ‘error’ in using the bill date as the final reading date instead of the actual reading date.

At the beginning of the quarter the meter reading on my bill was 15355 and at the end of the quarter it was 15784 thus 429 units were used in 86 days.

If you divide 429 by 86 and then multiple by the number of days in the first part of the quarter you get 394 units for the first part and 35 for the second part. My bill shows 403 units and 26. So E·ON’s estimate was in my favour.