Do you have a digital smart meter, or an old analogue meter that is read every 3 months ?
If analogue, and are being billed monthly, it's just estimated for 2 of the months, then read and whatever catch up is then made on every third bill, be it less or extra used over the estimated.
With an analogue meter, you never get accurate projections unless you upload meter reads yourself, and you should be able to do that each month just before the bill period is ending . . . the bills will be closer to what you should be getting charged then.
