Hey there,
I use AGL also, is it possible for you to share what your usage (not spending) was last year?
Ideally you would compare July/Aug 21 to July/Aug 20 given electricity/gas change throughout the seasons in my experience.
There's also a feature called bill rounding, so assuming nothing is wrong, it's worth exploring that in your account page on phone/desktop, so that your direct debit is roughly the same all year round (in my experience & usage)
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