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GIA Tariff Changes

For Discussion and Informational Purposes Only. GIA Tariff Changes. GIA Billing Workshop May 24, 2005. For Discussion and Informational Purposes Only. Section I -- GIA Bills. Non-Block Accounting (Linear). For Discussion and Informational Purposes Only.

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GIA Tariff Changes

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  1. For Discussion and Informational Purposes Only GIA Tariff Changes GIA Billing Workshop May 24, 2005

  2. For Discussion and Informational Purposes Only Section I -- GIA Bills

  3. Non-Block Accounting (Linear) For Discussion and Informational Purposes Only • Replaces block accounting used in previous tariffs • Follows the minute-to-minute profile of all schedules • Minimizes imbalance energy due to ramps

  4. For Discussion and Informational Purposes Only Old Block Accounting Tag(240 MW Tag, 10 Minute Ramps)

  5. New Linear Accounting Tag(240 MW Tag, 10 Minute Ramps) For Discussion and Informational Purposes Only

  6. Energy Allocation on Tag For Discussion and Informational Purposes Only

  7. For Discussion and Informational Purposes Only GIA Schedule Integration Calculation Formula ((Max-Lowest Beginning or Ending MWH) * Segment Time/60*.5) + (Lowest Beginning or Ending MWH * Segment Time/60)

  8. For Discussion and Informational Purposes Only GIA Linear Schedule Calculation 240 MWh Schedule Hour Ending 09:00

  9. For Discussion & Informational Purposes Only ABCGIA Hourly Imbalance Report03/02/2005 (Non-QF)

  10. Summary of Other GIA Changes For Discussion and Informational Purposes Only

  11. For Discussion and Informational Purposes Only Section II -- GRS Bills

  12. GRS Calculation Factors For Discussion and Informational Purposes Only • Instantaneous Imbalance = Difference Between SCADA Output & Linear Schedule Snapshots Taken at Clock-Ten-Minute Intervals • Hourly Capacity Used = Absolute maximum Instantaneous Imbalance ( + or - ) • Daily Service Used = Largest Hourly Capacity Used for the day • Daily Charge = Daily Service Used x GRS Tiered Rates

  13. Performance Classes For Discussion and Informational Purposes Only • Three class structure • Measures ability to stay on schedules • Classes are determined monthly at month end based on Percentage component & number of Unit Trips declared

  14. Percentage Component Calculation For Discussion and Informational Purposes Only • Based on ten-minute snapshots • Calculation = Tier 1 Snapshots / Applicable Snapshots • Tier 1 Snapshots = instantaneous imbalances that fall within Tier 1 • Applicable Snapshots = Total snapshots with schedules or generation above 10 MW MINUS any snapshots exempted by unit trips or in hours with Testing schedules only

  15. Unit Trip Component For Discussion and Informational Purposes Only • Delivering Party has the right but NOT the obligation to declare unit trips • Exempts three consecutive snapshots following a unit trip from Percentage Component of the Performance Class calculation • Declare unit trips in writing with supporting documentation to the SOC no later than one business day after the end of the month in which the unit trip occurred

  16. Component Measures For Discussion and Informational Purposes Only

  17. For Discussion and Informational Purposes Only GRS Tiered Rates($ / kw-day)

  18. For Discussion and Informational Purposes Only ABCGRS 10 Minute Snapshot Report

  19. For Discussion and Informational Purposes Only ABCGRS 10 Minute Snapshot Report (cont.)

  20. For Discussion & Informational Purposes Only ABCGRS Daily Charge Report (Non-QF)

  21. GRS Statistics for March 2005 For Discussion and Informational Purposes Only

  22. Section III -- Bill Comparisons For Discussion and Informational Purposes Only • Bill with GRS charges and no GIA charges. Explanation: GRS imbalance based on a 10 min snapshot. GIA imbalance based on an integrated hour. • Bill without GRS charges but with GIA charges / credits. Explanation: All the GRS imbalance falls within Tier 1 which has 00.00 rate (no charge). All GIA imbalances are subject to imbalance charge or credit.

  23. For Discussion & Informational Purposes Only AAAGRS Daily Charge Report(QF)

  24. For Discussion and Informational Purposes Only AAAGIA Hourly Imbalance Report03/20/2005 (QF)

  25. For Discussion and Informational Purposes Only AAAGRS Daily Charge Report(QF)

  26. For Discussion and Informational Purposes Only AAAGIA Hourly Imbalance Report03/28/2005 (QF)

  27. For Discussion and Informational Purposes Only Questions?

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