Electrical infrastructure starts with the main electrical panel.
Outages come at unexpected times. A smart panel allows you to control what circuits you need in an outage and then turn the other ones off. This conserves your stored electricity and gives correct expectations on how much time you have left with the battery. With a smart panel you can also set the breakers to shut off as the electricity available goes lower.
Data with the smart panel is very extensive. Each circuit will individually show how much electricity is being consumed in real time and also the historic consumption data.