We were also working on several systems used by an energy information and procurement company in USA.
One of the web systems is an application for multi-tenant properties and is used for sub-metering. Meters are read electronically and manually through this system and the electricity and other utilities are measured and properly billed among all the tenants of a building, on a timely basis.
Also there are Web Reports on a building-wide basis and on a tenant-by-tenant basis. The software tracks historical trends, analyzes and forecasts utility revenues and immediately alerts a client if consumption or cost recovery is changing.