1. Injection / Withdrawal Transmission Cost Allocation Updated Slides OMS CARP Group November 19, 2009

2. 2 Current Att. O Transmission Revenue Requirements by Pricing Zone and Voltage Level Source: FERC Docket ER07-1233 filed August 1, 2007, except for MEC and MPW who were not members at this date. MEC submitted the stated percents and MPW assumed to have similar break-down as CWLP and CWLD. ATC has also submitted updated percentages. Note: 2009 Att. O Revenue Requirements includes Account 456.1 External Transaction Revenue Replacement for Slide 87

3. 3 Scenario 4: Engineering Analysis Scenario

4. 4 Difference in Load and Generation Charges by Pricing Zone Scenario 4: Engineering Analysis for All Revenue vs. Scenario 1: Engineering Analysis except Att. O Local Replacement for Slide 108

5. 5 Difference in Total Charges to Load by Pricing Zone Scenario 4: Engineering Analysis for All Revenue vs. Scenario 1: Engineering Analysis except Att. O Local Replacement for Slide 109

6. 6 Difference in Total Charges to Load by State Scenario 4: Engineering Analysis for All Revenue vs. Scenario 1: Engineering Analysis except Att. O Local Replacement for Slide 110

7. 7 $/MWh Difference in Total Charges to Load by Pricing Zone Scenario 4: Engineering Analysis for All Revenue vs. Scenario 1: Engineering Analysis except Att. O Local Replacement for Slide 111

8. 8 $/MWh Difference in Total Charges to Load by State Scenario 4: Engineering Analysis for All Revenue vs. Scenario 1: Engineering Analysis except Att. O Local Replacement for Slide 112

9. 9 Estimated State Percentage Retail Rate Impact Scenario 4: Engineering Analysis for All Revenue vs. Scenario 1: Engineering Analysis except Att. O Local Replacement for Slide 113