GIA Tariff Changes

1
GIA Tariff Changes
For Discussion and Informational Purposes Only

• GIA Billing Workshop
• May 24, 2005

2
Section I -- GIA Bills
For Discussion and Informational Purposes Only
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
Old Block Accounting Tag(240 MW Tag, 10 Minute
Ramps)
For Discussion and Informational Purposes Only
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 0900
9
ABCGIA Hourly Imbalance Report03/02/2005
(Non-QF)
For Discussion Informational Purposes Only
10
Summary of Other GIA Changes
For Discussion and Informational Purposes Only
11
Section II -- GRS Bills
For Discussion and Informational Purposes Only
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
GRS Tiered Rates( / kw-day)
For Discussion and Informational Purposes Only
18
ABCGRS 10 Minute Snapshot Report
For Discussion and Informational Purposes Only
19
ABCGRS 10 Minute Snapshot Report (cont.)
For Discussion and Informational Purposes Only
20
ABCGRS Daily Charge Report (Non-QF)
For Discussion Informational Purposes Only
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
AAAGRS Daily Charge Report(QF)
For Discussion Informational Purposes Only
24
AAAGIA Hourly Imbalance Report03/20/2005 (QF)
For Discussion and Informational Purposes Only
25
AAAGRS Daily Charge Report(QF)
For Discussion and Informational Purposes Only
26
AAAGIA Hourly Imbalance Report03/28/2005 (QF)
For Discussion and Informational Purposes Only
27
For Discussion and Informational Purposes Only

• Questions?