An app that gets, stores and summarises data from IoT devices/systems. The main aim is to show analysis of the energy usage of a business/client by collecting info from a source (favourably IoT device :P)
A digital heater may collect heat information and stores it in a database. This app will then take these readings, and show them to the company. How? Probably by showing the hourly, daily, weekly or monthly usage the company has at that one IoT device, and a report of all energy usages.
The Value of the app to users is that they may more efficiently have control over how much energy they use, where most of the energy comes from so that they can control it better for a greener environment.