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)

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.

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.