How is a building's energy savings calculated in the Energy Consumption - Analytics report?

The expected energy consumption for a building shall be configured in Report settings for a day and the savings for the day/week/month shall be computed by taking the difference between the actual energy consumption for the day/week/month and this configured value.

To configure this, please follow the below steps-

Sign in to Web Reports
From the left navigation menu, go to Reports>Analytics
Choose the 'Energy' option from the tab at the top
Go to Report Settings and Click 'Savings Settings'
You can configure the Expected Consumption for the Building here

If the expected energy consumption for the building has not been configured, savings shall be computed by taking the difference between the actual energy consumption for the day/week/month and the maximum energy consumed so far for a day/week/month (depending on the duration chosen-day/week/month in the reports page)