1. Actions for Mod209 Workgroup
July 15th 2008

2. Review of minimum base period for AQ calculation
Aim to have a twelve months between the two meter reads forming the AQ base period
Where this cannot be achieved a longer period is assessed first before reducing to a minimum period
Current minimum base period is 6 months and 1 day
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3. Analysis presented as part of review group 177
Data used is data recorder and data logger information from the Demand Estimation sample
Sample size was 3,788 (split between 2,154 SSP and 1,634 LSP)
Data used current live system AQ and daily actual consumption to produce estimated AQ for varying periods after weather correction
Variability was calculated against actual weather corrected consumption for a 12 month period
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4. Variability of estimated AQ
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5. Impact of extended base period on rollover AQ
Longer base period may mean longer between AQ recalculation
Following analysis assesses whether a 6 month base period would provide improvements on continuing with the current AQ
Sample data is consistent with previous analysis
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6. Will benefits be achieved in a change?
For two base periods the analysis assesses those sites where revising the AQ would be closer to actual consumption than the current live AQ
For 6 month base period over 59% of the time it is better to maintain the current AQ
For 9 month base period it is better to maintain the current AQ in only 38% of cases
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7. SSP to LSP Threshold
Data based on sites in 2005/6 and 2006/7 AQ reviews where the site crossed the SSP/LSP threshold at least once
23,916 sites used for the analysis
Results look at the impact on number of rollovers and aggregate AQ of not recalculating where the change is below a tolerance
Additional information concentrating on sites that cross the threshold annually
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8. Threshold tolerance impacts (1)
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9. Threshold tolerance impacts (2)
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10. Threshold Crosser impacts (3)
Considering sites that cross annually:
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