Savings
Calculating actual savings
When calculating the actual savings we provide three options:
- HHD – A comparison of half hour data over a 3 month period from before and after the installation. We also take into consideration if the site loading has changed (e.g. installing or removing equipment, changing occupancy levels, etc), any weather affected loads (using the relevant degree days) and how they would affect electricity consumption. HHD is the option recommended due to the accuracy of the results received from this calculation method.
- Independent verification – Saving results independently verified by The University of Sheffield’s Department of Probability and Statistics. A regression line is fitted to the daily comsumption prior to the installation. This regression uses a baseline figure and takes facotrs into account to calculate a forecasted consumption figure. Therefore, the methodology predicts what the consumption would have been without any energy saving devices. An accuracy of +/- 1% is guaranteed.
- IPMVP - An independent company verifies the savings using the International Performance Measurement and Verification Protocol (IPMVP) method. IPMVP uses variables which can also be assigned to the user. Accuracy could significantly vary dependant upon the number of variables.
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