Bill cost

Why is my bill £45 per month? I live alone and last month used 73 units @ 13.43p per unit. That is £9.80. Even with the 25p per day standing charge that is not £45. I have friends who have 2 people in their flat and they pay half of what I do. I am not a high user.

Did you send in your readings on time? if not Bulb will use estimates which of course can be higher than actual usage. It will not affect what you pay as this will be set at your dd level. You should receive an email a couple of days before readings are due, so the next actual readings will level out your usage and bring it back inline. Just make sure you send them in on time.
Do not confuse your statement bill with dd payments.