Attached is a sample Drupal Spec for BACnet Projects.
If your customer is demanding a FOSS based energy dashboard solution that can be hosted on the environment of their choosing, integrated into their existing website (or not), and can be extended (by them or others) to do anything that the web can do, then this is how to get that portion built into your construction project.
It can easily be modified and adapted for the particular project requirements, and even made to 'embed' these energy dashboard components into existing web sites so the data goes where the people are.