The Web version allows you to register your account(s) to receive notifications through E-Mail and/or text message. The Web has a Profile page available for you to maintain your personal information, password, security pass phrase and stored payment methods.
The Mobile App is a native application that can be downloaded and installed on your compatible mobile phone or tablet device. The Web version is internet accessible from any web enabled device. Both the Web and the App version give you secure access to maintain your account information, view your bills, see payment history, make payments on one or more accounts, report meter readings, and report an outage.  They also allow you to monitor your monthly energy usage in graph format.