CUSUM
Cumulative sum
Running total of period energy-saving values (actual minus expected). Sign indicates improving or worsening performance.
Also known ascumulative sum of energy saving
In AEYS reports, energy saving is actual minus expected consumption. Positive CUSUM means excess use and worsening performance; negative CUSUM means improving performance. Totals are kept on monthly, energy-review, and annual bases.
CUSUM is listed among the SEU EnPI bullets next to EEI, EII, and SET.
Sources
- AEYS company energy report
- ISO 50006 practice