2013 Attachment O True-Up Stakeholder Meeting Ameren Transmission Company of Illinois and Ameren Illinois Company August 22, 2014

2 AGENDA Main Purpose is to review ATXI and AIC 2013 Transmission Rate Actuals and True-Up Calculations Timeline ATXI 2013 True Up AIC 2013 True Up 2014 AMIL Pricing Zone NITS Charge There will be a meeting held on October 1 to review the 2015 Transmission Rate calculations.

3 NEW PROTOCOL TIMELINE Date Proposed Schedule (Forward-Looking) June 1  Posting of annual true-up for prior year September 1  Deadline for annual true-up meeting September 1  Posting of net projected revenue requirement for following year October 15  Deadline for annual projected rate meeting November 1  Deadline for joint meeting on regional cost-shared projects March 15  Transmission Owners submit informational filing to the Commission

4 ATXI Revenue Requirement Projected 2013 vs Actual 2013

5 ATXI 2013 TRUE UP Ameren Transmission Company of Illinois Attachment O Revenue Requirement True-Up For the Year Ended 12/31/2013 Attachment O Net Actual Revenue Requirement (Attachment O, Pg 1, Line 7) $ 8,951,929 Net Projected Revenue Requirement (2013 Projected Attachment O, Pg 1, Line 7) $ 7,406,002 Under/(Over) Recovery of Net Revenue Requirement $ 1,545,927 Historic Year Actual Divisor for Pricing Zone (AIC Attachment O, Pg 1, Line 15) 7,219,333 Projected Year Divisor for Pricing Zone (AIC 2013 Projected Attachment O, Pg 1, Line 15) 7,175,041 Difference between Historic & Projected Yr Divisor 44,292 Prior Year Projected Annual Cost ($ per kw per yr) $ 1.03 Prior Year Under/(Over) Divisor True-up $ (45,719) Total Under/(Over) Recovery $ 1,500,209 Monthly Interest Rate (to be updated through July, 2014)0.03% Interest For 24 Months $ 12,530 Total Under/(Over) Recovery Including Interest $ 1,512,738

6 ATXI 2013 TRUE UP ATXI Rate Base Page.Line 2013 Projection2013 ActualChangePercent 2.6Total Gross Plant63,438,00065,513,3762,075,3763% 2.12Total Accum Depreciation2,652,0002,652, % 2.18TOTAL NET PLANT60,786,00062,860,9692,074,9693% 2.18a100% CWIP RECOVERY33,665,00030,479,705-3,185,295-9% ADJUSTMENTS TO RATE BASE 2.20 Account No ,172,000-11,913,988258,012-2% 2.21 Account No ,000-1,015,112-1,007, % 2.22 Account No. 1903,984,0002,009,733-1,974,267-50% 2.25 Land Held for Future Use000N/A 2.26 CWC115,500502,111386,611335% 2.27 Materials & Supplies000N/A 2.28 Prepayments000N/A TOTAL ADJUSTMENTS-8,080,500-10,417,256-2,336,75629% 2.30TOTAL RATE BASE86,370,50082,923,418-3,447,082-4%

7 ATXI 2013 TRUE UP ATXI Expenses Page.Line 2013 Projection2013 ActualChangePercent O&M 3.1 Transmission41,000625,430584, % 3.1a Less LSE Expenses000N/A 3.2 Less Account N/A 3.3 A&G883,0003,391,4622,508,462284% 3.4 Less FERC Annual Fees000N/A 3.5 Less EPRI, ect.04,594 N/A 3.5a Plus Trans. Reg. Comm. Exp04,594 N/A 3.8TOTAL O&M924,0004,016,8923,092,892335% 3.12TOTAL DEPRECIATION1,006,0001,005, % TAXES 3.13 Payroll000N/A 3.16 Property013,719 N/A 3.18 Other25,00023,296-1,704-7% 3.27 Income Taxes4,189,0844,004, ,232-4% TOTAL TAXES4,214,0844,041, ,217-4% TOTAL EXPENSES6,144,0849,064,6852,920,60048%

8 ATXI 2013 TRUE UP ATXI Actual Capital Structure Capital Structure Projection Page.Line $%CostWeighted 4.27 Long Term Debt39,000,00044% Preferred Stock00% Common Stock49,540,00056% Total88,540,000100% Capital Structure Actual Page.Line $%CostWeighted 4.27 Long Term Debt35,923,07744% Preferred Stock00% Common Stock44,946,03056% Total80,869,107100% Change in Return0.0901%

9 ATXI 2013 TRUE UP Total ATXI Revenue Requirement Page.Line 2013 Projection2013 ActualChangePercent 2.30TOTAL RATE BASE86,370,50082,923,418-3,447,082-4% 4.30Rate of Return on ACS8.49%8.58%0.09%1% 3.28Return from ACS7,336,7637,118, ,111-3% 2.30a100% CWIP RECOVERY33,665,00030,479,705-3,185,295-9% 4.30eIncremental Rate of Return on HCS0.00%0.04%0.03%752% 3.28aIncremental Return from HCS1,42210,9719,548671% Total Return7,338,1857,129, ,562-3% Total Expenses6,144,0849,064,6852,920,60048% 3.29TOTAL GROSS REV. REQ.13,482,27016,194,3082,712,03820% 3.30Less ATT. GG Adjustment000N/A 3.30aLess ATT. MM Adjustment5,588,3516,647,5701,059,21919% 3.31GROSS REV. REQ. UNDER ATT. O7,893,9199,546,7381,652,81921%

10 ATXI 2013 TRUE UP ATXI True-up & Net Revenue Requirement Page.Line 2013 Projection2013 ActualChangePercent 1.1Gross Revenue Requirement7,893,9199,546,7381,652,81921% 1.6Total Revenue Credits487,917594,809106,89222% 1.6aHistoric Year Actual ATRR000N/A 1.6bProjected ATRR from Prior Year000N/A 1.6cPrior Year ATRR True-Up000N/A 1.6dPrior Year Divisor True-Up000N/A 1.6eInterest on Prior Year True-Up000N/A 1.7NET REVENUE REQUIREMENT7,406,0028,951,9291,545,92821%

11 ATXI 2013 ACTUALS ATXI Attachment MM Calculation - Page 1 (1)(2)(3)(4) Attachment O LinePage, Line, Col.TransmissionAllocator No. 1Gross Transmission Plant - TotalAttach O, p 2, line a col 5 (Note A) 95,993,081 1aTransmission Accumulated DepreciationAttach O, p 2, line 8 col 5 (Note A) 2,652,407 2Net Transmission Plant - TotalLine 1 minus Line 1a (Note B) 93,340,674 O&M TRANSMISSION EXPENSE 3Total O&M Allocated to TransmissionAttach O, p 3, line 8 col 5 4,016,892 3aTransmission O&MAttach O, p 3, line 1 col 5 625,430 3bLess: LSE Expenses included in above, if anyAttach O, p 3, line 1a col 5, if any - 3cLess: Account 565 included in above, if anyAttach O, p 3, line 2 col 5, if any - 3dAdjusted Transmission O&MLine 3a minus Line 3b minus Line 3c 625,430 4Annual Allocation Factor for Transmission O&M(Line 3d divided by line 1a, col 3)23.58% OTHER O&M EXPENSE 4aOther O&M Allocated to TransmissionLine 3 minus Line 3d 3,391,462 4bAnnual Allocation Factor for Other O&MLine 4a divided by Line 1, col 33.53% GENERAL AND COMMON (G&C) DEPRECIATION EXPENSE 5Total G&C Depreciation ExpenseAttach O, p 3, lines 10 & 11, col 5 (Note H) - 6Annual Allocation Factor for G&C Depreciation Expense(line 5 divided by line 1 col 3)0.00% TAXES OTHER THAN INCOME TAXES 7Total Other TaxesAttach O, p 3, line 20 col 5 37,015 8Annual Allocation Factor for Other Taxes(line 7 divided by line 1 col 3)0.04% 9Annual Allocation Factor for Other ExpenseSum of line 4b, 6, and 83.57% INCOME TAXES 10Total Income TaxesAttach O, p 3, line 27 col 5 4,004,852 11Annual Allocation Factor for Income Taxes(line 10 divided by line 2 col 3)4.29% RETURN 12Return on Rate Base (Note I)Attach O, p 3, line 28 col 5 7,118,653 13Annual Allocation Factor for Return on Rate Base(line 12 divided by line 2 col 3)7.63% 14Annual Allocation Factor for ReturnSum of line 11 and % HYPOTHETICAL CAPITAL STRUCTURE (HCS) RETURN 15Annual Allocation Factor HCS Return (Note J)Attach O, p 4, line 30e0.04%

12 ATXI 2013 ACTUALS ATXI Attachment MM Calculation - Page 2 (1)(2)(3)(4)(5)(6)(7)(8)(9) Line No. Project Name MTEP Project Number Project Gross Plant Project Accumulated Depreciation Transmission O&M Annual Allocation Factor Annual Allocation for Transmission O&M Expense Other Expense Annual Allocation Factor Annual Allocation for Other Expense Annual Expense Charge (Note C) Page 1 line 4(Col 4 * Col 5)Page 1 line 9(Col 3 * Col 7)(Col 6 + Col 8) Multi-Value Projects (MVP) 1aPana-Sugar Creek2237 $ 7,603, % $ -3.57%$271, b Pana-Sugar Creek - Land - No HCS2237 $ 1,353, % $ -3.57%$48, cSidney-Rising2239 $ 1,394, % $ -3.57%$49, d Sidney-Rising - Land - No HCS2239 $ 1,097, % $ -3.57%$39, ePalmyra-Pawnee3017 $ 15,833, % $ -3.57%$565, f Palmyra-Pawnee - Land - No HCS3017 $ 7,790, % $ -3.57%$278, gFargo-Galesburg-Oak Grove3022 $ 3, % $ -3.57%$ h Fargo-Galesburg-Oak Grove - Land - No HCS3022 $ 284, % $ -3.57%$10, iPawnee-Pana3169 $ 2,078, % $ -3.57%$74, j Pawnee-Pana - Land - No HCS3169 $ 2,809, % $ -3.57%$100, kAdair-Palmyra3170 $ 1,838, % $ -3.57%$65, l Adair-Palmyra - Land - No HCS3170 $ 763, % $ -3.57%$27, (1)(2)(10)(11)(11a)(12)(13)(14)(15)(16) Line No. Project Name MTEP Project Number Project Net Plant Annual Allocation Factor for Return Annual Allocation Factor for HCS Return Annual Return Charge Project Depreciation Expense Annual Revenue Requirement True-Up Adjustment MVP Annual Adjusted Revenue Requirement (Col 3 - Col 4)(Page 1 line 14) (Page 1 line 15) (Note J) (Col 10 * Col a)(Note E) (Sum Col. 9, 12 & 13)(Note F) Sum Col. 14 & 15 (Note G) Multi-Value Projects (MVP) 1aPana-Sugar Creek2237 $ 7,603, %0.04% $ 908,900 $ - $ 1,180,480 $ - $ 1,180,480 1b Pana-Sugar Creek - Land - No HCS2237 $ 1,353, %0.00% $ 161,332 $ - $ 209,683 $ - $ 209,683 1cSidney-Rising2239 $ 1,394, %0.04% $ 166,674 $ - $ 216,476 $ - $ 216,476 1d Sidney-Rising - Land - No HCS2239 $ 1,097, %0.00% $ 130,745 $ - $ 169,930 $ - $ 169,930 1ePalmyra-Pawnee3017 $ 15,833, %0.04% $ 1,892,632 $ - $ 2,458,151 $ - $ 2,458,151 1f Palmyra-Pawnee - Land - No HCS3017 $ 7,790, %0.00% $ 928,461 $ - $ 1,206,723 $ - $ 1,206,723 1gFargo-Galesburg-Oak Grove3022 $ 3, %0.04% $ 425 $ - $ 553 $ - $ 553 1h Fargo-Galesburg-Oak Grove - Land - No HCS3022 $ 284, %0.00% $ 33,857 $ - $ 44,004 $ - $ 44,004 1iPawnee-Pana3169 $ 2,078, %0.04% $ 248,419 $ - $ 322,646 $ - $ 322,646 1j Pawnee-Pana - Land - No HCS3169 $ 2,809, %0.00% $ 334,866 $ - $ 435,226 $ - $ 435,226 1kAdair-Palmyra3170 $ 1,838, %0.04% $ 219,740 $ - $ 285,398 $ - $ 285,398 1l Adair-Palmyra - Land - No HCS3170 $ 763, %0.00% $ 91,021 $ - $ 118,301 $ - $ 118,301 2MVP Total Annual Revenue Requirements$6,647,570$0$6,647,570 3Rev. Req. Adj For Attachment O$6,647,570

13 ATXI 2013 TRUE UP ATXI 2013 Attachment MM True Up (a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k) Actual ProjectedAttachment MMActualTrue-UpApplicableTrue-Up MTEPActualAnnualRevenuesAnnualAdjustmentInterestAdjustmentTotal LineProject Attachment MMRevenueAllocatedRevenuePrincipalRate onInterestTrue-Up No.NameNumberRevenuesRequirement 1 to Projects 1 Requirement 1 Under/(Over) Adjustment Projected[Col. (d), line 1Actual Attachment MMx (Col. (e), line 2x /Attachment MMCol. (h) x Col. (i) p 2 of 2, Col Col. (e), line 3)] 2 p 2 of 2, Col Col. (g) - Col. (f)Line 5x 24 months 2 Col. (h) + Col. (j) 1 Actual Attachment MM revenues for True-Up Year 1 $ 5,146,572 2a Pana-Sugar Creek2237 1,813,837 1,670,447 1,180,480 (489,967) 0.03% (4,094) (494,061) 2b Pana-Sugar Creek - Land - No HCS , % 1, ,435 2c Sidney-Rising , , ,476 (133,920) 0.03% (1,119) (135,039) 2d Sidney-Rising - Land - No HCS , % 1, ,350 2e Palmyra-Pawnee3017 3,107,372 2,861,723 2,458,151 (403,572) 0.03% (3,372) (406,944) 2f Palmyra-Pawnee - Land - No HCS ,206, % 10,082 1,216,805 2g Fargo-Galesburg-Oak Grove % h Fargo-Galesburg-Oak Grove - Land - No HCS , % ,372 2i Pawnee-Pana , , ,646 58, % ,130 2j Pawnee-Pana - Land - No HCS , % 3, ,862 2k Adair-Palmyra , % 2, ,783 2l Adair-Palmyra - Land - No HCS , % ,289 3Subtotal $ 5,588,351 $ 5,146,572 $ 6,647,571 4Under/(Over) Recovery $ 1,500,999 $ 12,541 $ 1,513,540 5Applicable Interest rate per month (expressed to four decimal places)Interest Rate to be updated through July % 1 Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment MM, page 2, column Rounded to whole dollars.

14 ATXI 2013 MVP SPEND Ameren MVPs Ameren Name2013 CAPEXMTEP #sMTEP Description Illinois Rivers$59 million 2237Pana - Mt. Zion - Kansas - Sugar Creek 345 kV line 2239Sidney to Rising 345 kV line 3017Palmyra-Quincy-Meredosia - Ipava & Meredosia-Pawnee 345 kV Line 3169Pawnee to Pana kV Line 3170New Palmyra Substation (Maywood) Spoon River$3 million 3022Fargo-Galesburg-Oak Grove 345 kV Line Mark Twain$0 million 2248Adair - Ottumwa Adair-Palmyra 345 kV Line

15 AIC Revenue Requirement Projected 2013 vs Actual 2013

16 AIC 2013 TRUE UP Ameren Illinois Company - AIC Attachment O Revenue Requirement True-Up Year Ended December 31, 2013 Attachment O Net Actual Revenue Requirement (Attachment O, Pg 1, Line 7a) $ 123,689,426 Net Projected Revenue Requirement (2013 Projected Attachment O, Pg 1, Line 7a) $ 133,507,911 Under/(Over) Recovery of Net Revenue Requirement $ (9,818,485) Historic Year Actual Divisor for Pricing Zone (Attachment O, Pg 1, Line 15) 7,219,264 Projected Year Divisor for Pricing Zone (2013 Projected Attachment O, Pg 1, Line 15) 7,175,041 Difference between Historic & Projected Yr Divisor 44,223 Prior Year Projected Annual Cost ($ per kw per yr) $ Prior Year Under/(Over) Divisor True-up $ (822,872) Total Under/(Over) Recovery $ (10,641,357) Monthly Interest Rate (to be updated through July, 2014)0.27% Interest For 24 Months $ (691,603) Total Under/(Over) Recovery Including Interest $ (11,332,960)

17 AIC 2013 TRUE UP AIC Rate Base Page.Line 2013 Projection2013 ActualChangePercent 2.6Total Gross Plant1,196,828,9981,105,214,365-91,614,633-8% 2.12Total Accum Depreciation446,390,099449,948,6343,558,5341% 2.18TOTAL NET PLANT750,438,898655,265,731-95,173,167-13% 2.18a100% CWIP RECOVERY000N/A ADJUSTMENTS TO RATE BASE0N/A 2.20 Account No ,140, ,790,12541,350,047-19% 2.21 Account No ,556,597-3,195,3187,361,279-70% 2.22 Account No ,301,77722,884,353-24,417,424-52% 2.23 Account No N/A 2.25 Land Held for Future Use528,8002,358,6871,829,887346% 2.26 CWC4,399,0104,818,359419,34910% 2.27 Materials & Supplies4,093,9579,297,9075,203,950127% 2.28 Prepayments932,3481,089,692157,34317% TOTAL ADJUSTMENTS-173,440, ,536,44531,904,432-18% 2.30TOTAL RATE BASE576,998,022513,729,286-63,268,735-11%

18 AIC 2013 TRUE UP AIC Expenses Page.Line 2013 Projection2013 ActualChangePercent O&M 3.1 Transmission39,184,51739,359,186174,6690% 3.1a Less LSE Expenses3,090,0971,685,383-1,404,714-45% 3.2 Less Account 56511,657,49011,099, ,686-5% 3.3 A&G11,319,37411,962,118642,7446% 3.4 Less FERC Annual Fees000N/A 3.5 Less EPRI, ect.596,873342, ,149-43% 3.5a Plus Trans. Reg. Comm. Exp32,649353,476320,827983% 3.8TOTAL O&M35,192,08038,546,8693,354,78910% 3.12TOTAL DEPRECIATION22,002,47519,686,582-2,315,893-11% TAXES0N/A 3.13 Payroll875,947783,109-92,838-11% 3.16 Property1,001,216893, ,804-11% 3.18 Other367,419265, ,270-28% 3.27 Income Taxes26,404,24025,071,011-1,333,228-5% TOTAL TAXES28,648,82127,012,681-1,636,140-6% TOTAL EXPENSES85,843,37685,246, ,244-1%

19 AIC 2013 TRUE UP Total AIC Capital Structure Capital Structure Projection Page.Line $%CostWeighted 4.27 Long Term Debt1,693,174,71745% Preferred Stock61,721,3502% Common Stock1,977,269,37253% Total3,732,165,439100% Capital Structure Actual Page.Line $%CostWeighted 4.27 Long Term Debt1,725,866,46942% Preferred Stock61,632,3752% Common Stock2,307,081,96856% Total4,094,580,813100% Change in Return0.2923%

20 AIC 2013 TRUE UP Total AIC Revenue Requirement Page.Line 2013 Projection2013 ActualChangePercent 2.30TOTAL RATE BASE576,998,022513,729,286-63,268,735-11% 4.30Rate of Return10.06%10.36%0.29%3% 3.28Return58,068,88553,202,941-4,865,944-8% Total Expenses85,843,37685,246, ,244-1% 3.29TOTAL GROSS REV. REQ.143,912,261138,449,073-5,463,188-4% 3.30Less ATT. GG Adjustment2,393,2913,162,192768,90132% 3.30aLess ATT. MM Adjustment000N/A 3.31GROSS REV. REQ. UNDER ATT. O141,518,970135,286,881-6,232,089-4%

21 AIC 2013 TRUE UP AIC True-up & Net Revenue Requirement Page.Line 2013 Projection2013 ActualChangePercent 1.1Gross Revenue Requirement141,518,970135,286,881-6,232,089-4% 1.6Total Revenue Credits8,011,05811,597,4553,586,39745% 1.6a Historic Year Actual ATRR000N/A 1.6b Projected ATRR from Prior Year000N/A 1.6cPrior Year ATRR True-Up000N/A 1.6dPrior Year Divisor True-Up000N/A 1.6e Interest on Prior Year True-Up000N/A 1.7aNET REVENUE REQUIREMENT133,507,911123,689,426-9,818,485-7% 1.7bPrairie Power583,724243, ,506-58% 1.7AIC Adjusted Revenue Requirement134,091,635123,932,645-10,158,991-8%

22 AIC 2013 ACTUAL AIC Attachment GG Calculation - Page 1 (1)(2)(3)(4) Attachment O LinePage, Line, Col.TransmissionAllocator No. 1Gross Transmission Plant - TotalAttach O, p 2, line 2 col 5 (Note A)1,066,926,320 2Net Transmission Plant - TotalAttach O, p 2, line 14 and 23b col 5 (Note B) 630,842,437 O&M EXPENSE 3Total O&M Allocated to TransmissionAttach O, p 3, line 8 col 538,546,869 4Annual Allocation Factor for O&M(line 3 divided by line 1 col 3)3.61% GENERAL AND COMMON (G&C) DEPRECIATION EXPENSE 5Total G&C Depreciation ExpenseAttach O, p 3, lines 10 & 11, col 5 (Note H)1,451,559 6Annual Allocation Factor for G&C Depreciation Expense(line 5 divided by line 1 col 3)0.14% TAXES OTHER THAN INCOME TAXES 7Total Other TaxesAttach O, p 3, line 20 col 51,941,670 8Annual Allocation Factor for Other Taxes(line 7 divided by line 1 col 3)0.18% 9Annual Allocation Factor for ExpenseSum of line 4, 6, and 83.93% INCOME TAXES 10Total Income TaxesAttach O, p 3, line 27 col 525,071,011 11Annual Allocation Factor for Income Taxes(line 10 divided by line 2 col 3)3.97% RETURN 12Return on Rate BaseAttach O, p 3, line 28 col 553,202,941 13Annual Allocation Factor for Return on Rate Base(line 12 divided by line 2 col 3)8.43% 14Annual Allocation Factor for ReturnSum of line 11 and %

23 AIC 2013 ACTUAL AIC Attachment GG Calculation - Page 2 (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) Line No. Project Name MTEP Project Number Project Gross Plant Annual Allocation Factor for Expense Annual Expense Charge Project Net Plant Annual Allocation Factor for Return Annual Return Charge Project Depreciation Expense Annual Revenue Requirement True-Up Adjustment Network Upgrade Charge (Note C) (Page 1 line 9)(Col. 3 * Col. 4)(Note D) (Page 1 line 14)(Col. 6 * Col. 7)(Note E)(Sum Col. 5, 8 & 9)(Note F) Sum Col. 10 & 11 (Note G) 1aWood River-Roxford kV line728 $ 3,424, %$134, $ 3,098, %$384,474.94$51,625$570, $ -570,714 1bSidney-Paxton 138kV Reconductor 18 miles870 $ 5,994, %$235, $ 5,394, %$669,350.85$99,719$1,004, $ -1,004,708 1cCoffeen Plant-Coffeen, North - 2nd. Bus tie2829 $ 5,592, %$219, $ 5,341, %$662,758.36$97,898$980, $ -980,495 1dLatham - Oreana 8.5 mile 345kV line2068 $ 3,432, %$134, $ 3,426, %$425,130.21$46,217$606, $ -606,275 2Annual Totals$3,162,192$0$3,162,192 3Rev. Req. Adj For Attachment O$3,162,192

24 AIC 2013 TRUE UP AIC 2013 Attachment GG True Up (a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k) Actual ProjectedAttachment GGActualTrue-Up Applicabl eTrue-Up MTEPActualAnnualRevenuesAnnualAdjustmentInterestAdjustmentTotal LineProject Attachment GGRevenueAllocatedRevenuePrincipalRate onInterestTrue-Up No.NameNumberRevenuesRequirement 1 to Projects 1 Requirement 1 Under/(Over) Adjustment Projected[Col. (d), line 1Actual Attachment GGx (Col. (e), line 2x /Attachment GGCol. (h) x Col. (i) p 2 of 2, Col Col. (e), line 3)] 2 p 2 of 2, Col Col. (g) - Col. (f)Line 5x 24 months 2 Col. (h) + Col. (j) 1 Actual Attachment GG revenues for True-Up Year 1 $ 2,517,438 2aWood River-Roxford kV line , , ,714 6, % 49 6,554 2bSidney-Paxton 138kV Reconductor 18 miles , ,862 1,004,708 5, % 44 5,890 2cCoffeen Plant-Coffeen, North - 2nd. Bus tie , , ,495 26, % ,326 2dLatham - Oreana 8.5 mile 345kV line , % 4, ,873 3Subtotal $ 2,393,290 $ 2,517,438 $ 3,162,192 4Under/(Over) Recovery $ 644,754 $ 4,889 $ 649,643 5Applicable Interest rate per month (expressed to four decimal places)Interest Rate to be updated through July % 1 Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment GG, page 2, column Rounded to whole dollars.

25 SCHEDULE 9 NITS RATE FOR 2013* Page.Line 2013 Projection2013 ActualChangePercent 1.7AIC Adjusted Revenue Requirement134,091,635123,932,645-10,158,991-8% 1.7ATXI Adjusted Revenue Requirement7,406,0028,951,9291,545,92821% Total Revenue Requirement141,497,637132,884,574-8,613,063-6% 1.15Ameren Illinois Divisor7,175,0417,219,26444,2241%.Annual Cost ($/kW/Yr) (1.314)-7%.Network & P-to-P Rate ($/kW/Mo) (0.109)-7% * PPI became a TO in the AMIL pricing zone effective 6/1/13 so the actual AMIL 2013 rate would be higher than shown above.

QUESTIONS?

27 Appendix supplemental background information not covered in presentation

28 APPENDIX - AIC AND ATXI Both AIC and ATXI are transmission owning subsidiaries of Ameren Corporation, as well as 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, The sum of their Attachment O net revenue requirements equals the total revenue requirement for AMIL pricing zone to be collected under Schedule 9 (NITS)

29 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

30 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 ATXI has no Attachment GG projects

31 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

32 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

33 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

34 MISO MVPS Brief history of development Began investigating value added expansion in 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

35 APPENDIX - MAP OF AMEREN MVPS

36 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. ER

37 APPENDIX - MISO WEB LINKS Transmission Pricing - Attachments O, GG & MM Information s/Pages/TransmissionPricing.aspxhttps:// s/Pages/TransmissionPricing.aspx Ameren OASIS MTEP 13 Pages/MTEP13.aspxhttps:// Pages/MTEP13.aspx MTEP 14 Pages/MTEP14.aspxhttps:// Pages/MTEP14.aspx Schedule 26 & 26-A Indicative Charges Pages/MTEPStudies.aspxhttps:// Pages/MTEPStudies.aspx

38 APPENDIX - AIC AND ATXI Additional questions can be sent to Ameren’s Formula Rates address