On the My Customer Portal screen, click on "Prefill Form":
Enter the email, utility and name of the accounts you would like to receive authorization for:
Enter as much information as you have for the first account (this saves your customer time entering data that you already know). When you're done, click:
Click "Add Another" to display an additional registration information input section:
Enter the additional login information.
Repeat until all accounts have been entered.
Click on "Save" to save your prefilled form: