Australia, energy companies are heavily regulated regarding how they manage your account, and they are required to inform you of changes to your contract, which includes the billing cycle. Requirements for billing cycle changes in Australia (under the National Energy Customer Framework, covering NSW, SA, ACT, TAS, and QLD):Advance Notice of Changes: Retailers must let you know if they change your contract, which includes the terms regarding how and when you are billed.Explicit Informed Consent: ...