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wayne123
Ok so it looks like some larger bills in march , may and september 2021 and similarly in 2022 put the account into debit and the DD was adjusted to recover that.
However the account is now in credit - but you can see that large bills arrive after the winter period when most of us use heaps more energy.
Remember that prices went up substantially last winter 2022 and will be even higher (about double again) this winter.
Your DD should be about one twelfth of the annual forecast bill (see your bill/statement) at todays prices, after adjustment for any debit /credit on the account. Setting the DD will not take account of the government discounts, of which you've had 2 instalments , 4 more to come. Prices though will rise another 20% in April we're told so you need to factor that into your thoughts as well.
Sit down look at your forecast consumption and the prices, and work out the annual amount. Knock of your current credit and divide the total by 12. That is a reasonable direct debit, and no supplier could negate that.
If you send regular readings monthly, you will get a better handle on what you are using. Your account may swing into the red this winter but recover to a positive balance next autumn - this is entirely normal with fixed direct debits - the winter months under recover, the summer months over recover.
If you switch to variable DD on receipt of bill, your payments will be huge in the winter and lighter in the summer. Chose the method that suits you.
Energy is now hideously expensive and the only thing we can do to moderate our costs is to cut our consumption.