2014 Attachment O True-Up Stakeholder Meeting Ameren Illinois Company

1. 2014 Attachment O True-Up Stakeholder Meeting Ameren Illinois Company July 29, 2015

2. Agenda Main Purpose is to review AIC 2014 Transmission Rate True-Up Calculations • Timeline • AIC 2014 True Up • 2014 AMIL Pricing Zone NITS Charge An additional meeting will be held in October to review the 2016 Projected Transmission Rate calculations.

3. New Protocol timeline

4. AIC Revenue Requirement Projected 2014 vs Actual 2014

5. Aic2014 attachment o true up

6. Aic 2014 rate base

7. Aic2014 expenses

8. Aic2014 Capital strcuture

9. Aic2014 total revenue requirement

10. Aic2014 true up & Net revenue requirement • * AIC did not use a projected calculation in 2012, so there is no prior year True-up included in 2014.

11. Aic2014 attachment gg AIC Attachment GG Calculation - Page 1

12. Aic 2014 attachment gg AIC Attachment GG Calculation - Page 2

13. Aic 2014 attachment gg True-up AIC 2014 Attachment GG True Up

14. Aic 2014 attachment MM AIC Attachment MM Calculation - Page 1

15. Aic 2014 attachment MM AIC Attachment MM Calculation - Page 2

16. Aic 2014 attachment MM AIC Attachment MM Calculation - Page 2 (continued)

17. Aic 2014 attachment MM true-up AIC 2014 Attachment MM True Up

18. AIC 2014 MVP SPEND

19. 2014 Significant transmission projects added to plant

20. QUESTIONS?

21. Appendix Supplemental Background Information (Not covered during presentation)

22. Appendix – AMIL Pricing Zone • Both AIC and ATXI are transmission owning subsidiaries of Ameren Corporation, as well as a MISO Transmission Owners (TOs) • AIC will continue to build and own traditional reliability projects • ATXI is in the process of building and will own new regional transmission projects • Prairie Power, Inc. became a TO in the AMIL pricing zone effective June 1, 2013. • The sum of all there Attachment O net revenue requirements equals the total revenue requirement for AMIL pricing zone to be collected under Schedule 9 (NITS)

23. Appendix - MISO ATTACHMENTs O, GG & MM Calculate rates for Schedules 9, 26 & 26-A • Attachment GG - Schedule 26 • Attachment MM - Schedule 26-A • Attachment O - net revenue requirement billed under Schedule 9 • Schedules 26 and 26-A are billed by MISO • Schedule 9 is billed by Ameren

24. Appendix - MISO ATTACHMENT gg • Cost Recovery for certain Network Upgrades • Eligible projects • Market Efficiency • Generator Interconnections • Cost shared based upon project type • MISO-wide based on load • Subregional based on LODF (Line Outage Distribution Factor) • AIC has four Attachment GG projects completed • Two additional projects under construction • These projects were approved by MISO under prior Tariff provisions which allowed limited cost sharing for certain reliability projects

25. Appendix - MISO ATTACHMENT MM • Cost recovery for Multi-Value Projects (MVPs) • Very similar format as Attachment GG • Criteria for being considered • Developed through planning process and support energy policy • Multiple types of economic value across multiple pricing zones with benefit to costs > 1 • Address at least one: • Projected NERC violation • Economic-based issue • Cost shared across MISO based on load • AMIL Zone is approximately 9% • Ameren MVPs will primarily be built by ATXI • AIC will be responsible for modifications needed to its existing facilities

26. Appendix - MISO ATTACHMENT O, GG & MM • All transmission costs included in Attachment O calculation • Schedule 9 based on net revenue requirement – reductions for: • Costs recovered in Schedules 26 & 26-A • Revenue Credits • Point-to-Point revenue in Schedules 7 & 8 • Rental revenue • Revenue from generator interconnections

27. Appendix - Miso transmission expansion plan (MTEP) • Developed on an annual basis building upon previous analysis • MISO, Transmission Owners & Stakeholders • Includes subregional planning meetings • MTEP goals • Ensure the reliability of the transmission system • Ensure compliance with NERC Standards • Provide economic benefits, such as increased market efficiency • Facilitate public policy objectives, such as meeting Renewable Portfolio Standards • Address other issues or goals identified through the stakeholder process • Multiple future scenarios analyzed • End result – comprehensive, cohesive plan for MISO footprint • MTEP approved by MISO Board of Directors

28. MISO MVPS • Brief history of development • Began investigating value added expansion in 2003 • 2008 Regional Generation Outlet Study (RGOS) - formed basis of Candidate MVP portfolio • Portfolio refined due to additional analysis • MISO approved portfolio of 17 Projects • Seven transmission line segments (MTEP proj numbers)in Ameren territory • Ameren identifies these three projects as: • Illinois Rivers (four line segments) • Spoon River • Mark Twain (two line segments) • Broadly cost-shared, AMIL pricing zone allocated 9% of each MVP no matter where project is located or who builds it

29. Appendix - MAP OF AMEREN MVPs

30. Appendix - Rate incentives • FERC approved the following rate incentives for Illinois Rivers in Docket No. EL10-80 • CWIP (no AFUDC) • Abandonment (requires additional filing prior to recovery) • Hypothetical capital structure during construction for ATXI • FERC approved similar incentives for Spoon River and Mark Twain Projects in Docket No. ER12-2216

31. Appendix - Miso web links • Transmission Pricing - Attachments O, GG & MM Information • https://www.misoenergy.org/MarketsOperations/TransmissionSettlements/Pages/TransmissionPricing.aspx • Ameren OASIS • http://www.oasis.oati.com/AMRN/index.html • MTEP 14 • https://www.misoenergy.org/Planning/TransmissionExpansionPlanning/Pages/MTEP14.aspx • MTEP 15 • https://www.misoenergy.org/Planning/TransmissionExpansionPlanning/Pages/MTEP15.aspx • Schedule 26 & 26-A Indicative Charges • https://www.misoenergy.org/Planning/TransmissionExpansionPlanning/Pages/MTEPStudies.aspx

32. Appendix – AiC • Additional questions on these topics can be sent to Ameren at: • MISOFormulaRates@ameren.com