Thank you for your feedback.
Coincidentally, we are already working on adding bill reminders and meter read notification on the AGL Energy app. If you download our app then you'll receive these features as soon as they become available.
Here is a quick summary on how it will work:
You set a bill reminder, choosing when you want the reminder to occur. The app will send you a notification at the time and clicking the notification will navigate you to the exact bill to be paid.