What elements use estimation techniques?

• Performance Overview
• Period Summary Overview
• Site Overview – Information Widget, Performance Widget
• Dashboard widgets – Consumption Plot, Estate/Group Energy Usage, Highest/Lowest Performing Sites, Year on Year
• GHG Reporting
• Project Tracking

How is it data gathered?

• The data is gathered from existing Supply Points within the Sigma database
• The data is collected initially based on the best available data from each Supply Point, with the following hierarchy
  • Periodic Channels (actual)
  • Non Periodic Channels (actual)
  • Billing Data (actual)
  • Billing Data (estimated)
  • Virtual Meter Data
  • Consumption data
• Once all of the available data has been collected Sigma will then assess any gaps in the data and attempt to fill them with Sigma Estimated data
  • Periodic Channels (estimated)
  • Non Periodic Channels (estimated)
  • Pro Rata (Sigma Estimate)
  • Direct Comparison (Sigma Estimate)

How is the estimated data calculated?

Pro Rata Calculation:

• Sigma attempts to find the first period of 3+ months data within 1 year of the gap
• Then Sigma takes an average value of this period to use for each 30 minute interval in order to fill the gap

Direct Comparison Calculation:

• Sigma will fill any gaps by using data from 52 weeks previous. (Using 52 weeks instead of 1 year ensures that the data is for the same day of the week)
• This data calculation method is not used on Performance Overview, Estate/Group Energy Usage, Highest/Lowest Performing Sites and the Year on Year widget