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Actions for Mod209 Workgroup

Actions for Mod209 Workgroup. July 15 th 2008. 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

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Actions for Mod209 Workgroup

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  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 Theme Date Department

  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 Theme Date Department

  4. Variability of estimated AQ Theme Date Department

  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 Theme Date Department

  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 Theme Date Department

  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 Theme Date Department

  8. Threshold tolerance impacts (1) Theme Date Department

  9. Threshold tolerance impacts (2) Theme Date Department

  10. Threshold Crosser impacts (3) • Considering sites that cross annually: Theme Date Department

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