2017 Attachment O Projection Stakeholder Meeting Ameren Transmission Company of Illinois October 3, 2016

Purpose is to review 2017 Projected Transmission Rate Calculations Agenda Purpose is to review 2017 Projected Transmission Rate Calculations Protocol Timeline ATXI 2017 Projection Attachment O Attachment MM 2017 AMIL Pricing Zone NITS Charge 2015 MVP Spend ROE Complaint Cases Impact of ROE Order issued September 28, 2016

(Forward-Looking Protocols) Protocol timeline Date Schedule (Forward-Looking Protocols) June 1 Posting of annual true-up for prior year September 1 Deadline for annual true-up meeting 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

ATXI Revenue Requirement Projected 2016 vs Projected 2017

Atxi 2017 Projected Rate Base Page.Line Jan-16 Jan-17 Change Percent 2.6 Total Gross Plant 244,237,971 793,570,602 549,332,631 225% 2.12 Total Accum Depreciation 9,096,778 19,665,259 10,568,481 116% 2.18 TOTAL NET PLANT 235,141,193 773,905,343 538,764,151 229% 2.18a 100% CWIP RECOVERY 684,234,021 506,272,970 -177,961,052 -26% ADJUSTMENTS TO RATE BASE 2.20 Account No. 282 -39,044,786 -215,955,048 -176,910,261 453% 2.21 Account No. 283 -3,708,928 -4,285,216 -576,288 16% 2.22 Account No. 190 28,380,390 73,283,424 44,903,035 158% 2.25 Land Held for Future Use N/A 2.26 CWC 1,575,005 1,757,484 182,480 12% 2.27 Materials & Supplies 2.28 Prepayments 392,795 383,153 -9,642 -2% TOTAL ADJUSTMENTS -12,405,525 -144,816,203 -132,410,678 1067% 2.30 TOTAL RATE BASE 906,969,689 1,135,362,110 228,392,421 25%

ATXI 2017 Projected Expenses Page.Line Jan-16 Jan-17 Change Percent O&M 3.1 Transmission 1,200,387 2,886,648 1,686,262 140% 3.1a Less LSE Expenses N/A 3.2 Less Account 565 3.3 A&G 11,399,650 11,173,226 -226,425 -2% 3.4 Less FERC Annual Fees 3.5 Less EPRI, ect. 51,164 185,211 134,047 262% 3.5a Plus Trans. Reg. Comm. Exp 3.8 TOTAL O&M 12,600,037 14,059,874 1,459,837 12% 3.12 TOTAL DEPRECIATION 5,736,352 17,848,671 12,112,319 211% TAXES 3.13 Payroll 3.16 Property 763,426 1,770,467 1,007,041 132% 3.18 Other 500,000 645,000 145,000 29% 3.27 Income Taxes 42,008,093 52,289,795 10,281,701 24% TOTAL TAXES 43,271,519 54,705,262 11,433,742 26% TOTAL EXPENSES 61,607,909 86,613,807 25,005,898 41%

Atxi 2017 Projected capital structure Capital Structure - 2016 Projection Page.Line   $ % Cost Weighted 4.27 Long Term Debt 303,846,154 44% 3.9095% 1.7152% 4.28 Preferred Stock 0% 0.0000% 4.29 Common Stock 388,732,961 56% 12.3800% 6.9487% 4.30 Total 692,579,115 100% 8.6638% Capital Structure - 2017 Projection 461,538,462 4.3495% 1.9014% 594,255,651 6.9681% 1,055,794,113 8.8695% Change in Actual Return 0.2056% Hypothetical Capital Structure - 2017 Projection Actual Capital Structure Return Hypothetical Capital Structure Return 8.8466% Difference applied to Attachment MM -0.0229%

ATXI 2017 Projected total revenue requirement Page.Line Jan-16 Jan-17 Change Percent 2.30 TOTAL RATE BASE 906,969,689 1,135,362,110 228,392,421 25% 4.30 Rate of Return on ACS 8.66% 8.87% 0.21% 2% 3.28 Return from ACS 78,578,452 100,700,542 22,122,090 28% 2.30a 100% CWIP RECOVERY 684,234,021 506,272,970 -177,961,052 -26% 4.30e Incremental Rate of Return on HCS -0.01% -0.02% 111% 3.28a Incremental Return from HCS -74,367 -115,945 -41,579 56% Total Return 78,504,085 100,584,596 22,080,511 Total Expenses 61,607,909 86,613,807 25,005,898 41% 3.29 TOTAL GROSS REV. REQ. 140,111,994 187,198,403 47,086,410 34% 3.30 Less ATT. GG Adjustment N/A 3.30a Less ATT. MM Adjustment 130,383,256 177,032,278 46,649,022 36% 3.31 GROSS REV. REQ. UNDER ATT. O 9,728,737 10,166,125 437,388 4%

Atxi 2017 Projected Net Revenue Requirement & True up Page.Line Jan-16 Jan-17 Change Percent 1.1 Gross Revenue Requirement 9,728,737 10,166,125 437,388 4% 1.6 Total Revenue Credits 990,564 866,750 -123,815 -12% 1.6a Historic Year Actual ATRR 10,933,054 10,026,799 (906,255) -8% 1.6b Projected ATRR from Prior Year 10,761,294 9,851,594 (909,700) 1.6c Prior Year ATRR True-Up 171,760 175,205 3,445 2% 1.6d Prior Year Divisor True-Up (244,936) 240,111 485,047 -198% 1.6e Interest on Prior Year True-Up (4,756) 3,538 8,294 -174% 1.7 NET REVENUE REQUIREMENT 8,660,241 9,718,229 1,057,988 12%

Atxi 2015 Attachment O true uP Ameren Transmission Company of Illinois Attachment O Revenue Requirement True-Up Year Ended December 31, 2015 Attachment O Net Actual Revenue Requirement (Attachment O, Pg 1, Line 7) $ 10,026,799 Net Projected Revenue Requirement (2015 Projected Attachment O, Pg 1, Line 7) $ 9,851,594 Under/(Over) Recovery of Net Revenue Requirement $ 175,205 Historic Year Actual Divisor for Pricing Zone (AIC Attachment O, Pg 1, Line 15) $ 6,922,407 Projected Year Divisor for Pricing Zone (AIC 2015 Projected Attachment O, Pg 1, Line 15) 7,095,335 Difference between Historic & Projected Yr Divisor 172,928 Prior Year Projected Annual Cost ($ per kw per yr) $ 1.3885 Prior Year Under/(Over) Divisor True-up $ 240,111 Total Under/(Over) Recovery $ 415,316 Monthly Interest Rate (updated through July, 2016) 0.0355% Interest For 24 Months $ 3,538 Total Under/(Over) Recovery Including Interest $ 418,854

Atxi 2017 Projected attachment MM ATXI Attachment MM Calculation - Page 1 (1) (2) (3) (4) Attachment O Line Page, Line, Col. Transmission Allocator No. 1 Gross Transmission Plant - Total Attach O, p 2, line 2 + 18a col 5 (Note A) 1,288,513,534 1a Transmission Accumulated Depreciation Attach O, p 2, line 8 col 5 16,939,778 2 Net Transmission Plant - Total Line 1 minus Line 1a (Note B) 1,271,573,756 O&M TRANSMISSION EXPENSE 3 Total O&M Allocated to Transmission Attach O, p 3, line 8 col 5 14,059,874 3a Transmission O&M Attach O, p 3, line 1 col 5 2,886,648 3b Less: LSE Expenses included in above, if any Attach O, p 3, line 1a col 5, if any - 3c Less: Account 565 included in above, if any Attach O, p 3, line 2 col 5, if any 3d Adjusted Transmission O&M Line 3a minus Line 3b minus Line 3c 4 Annual Allocation Factor for Transmission O&M (Line 3d divided by line 1a, col 3) 17.04% OTHER O&M EXPENSE 4a Other O&M Allocated to Transmission Line 3 minus Line 3d 11,173,226 4b Annual Allocation Factor for Other O&M Line 4a divided by Line 1, col 3 0.87% GENERAL AND COMMON (G&C) DEPRECIATION EXPENSE 5 Total G&C Depreciation Expense Attach O, p 3, lines 10 & 11, col 5 (Note H) 1,412,898 6 Annual Allocation Factor for G&C Depreciation Expense (line 5 divided by line 1 col 3) 0.11% TAXES OTHER THAN INCOME TAXES 7 Total Other Taxes Attach O, p 3, line 20 col 5 2,415,467 8 Annual Allocation Factor for Other Taxes (line 7 divided by line 1 col 3) 0.19% 9 Annual Allocation Factor for Other Expense Sum of line 4b, 6, and 8 1.16% INCOME TAXES 10 Total Income Taxes Attach O, p 3, line 27 col 5 52,289,795 11 Annual Allocation Factor for Income Taxes (line 10 divided by line 2 col 3) 4.11% RETURN 12 Return on Rate Base (Note I) Attach O, p 3, line 28 col 5 100,700,542 13 Annual Allocation Factor for Return on Rate Base (line 12 divided by line 2 col 3) 7.92% 14 Annual Allocation Factor for Return Sum of line 11 and 13 12.03% HYPOTHETICAL CAPITAL STRUCTURE (HCS) RETURN 15 Annual Allocation Factor HCS Return (Note J) Attach O, p 4, line 30e -0.02%

Atxi 2017 Projected attachment MM 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) 1a Pana-Sugar Creek - CWIP 2237 $ 117,693,793 $ - 17.04% 1.16% $ 1,370,257 $ 1,370,257 1b Pana-Sugar Creek - Plant in Service - No HCS $ 130,125,045 $ 2,281,517 $ 388,785 $ 1,514,988 $ 1,903,773 1c Pana-Sugar Creek - Land - No HCS $ 4,491,478 $ 52,292 $ 52,292 1d Sidney-Rising - CWIP 2239 $ - $ - 1e Sidney-Rising - Plant in Service - No HCS $ 78,726,051 $ 1,331,641 $ 226,920 $ 916,572 $ 1,143,493 1f Sidney-Rising - Land - No HCS $ 1,285,913 $ 14,971 $ 14,971 1g Adair-Ottumwa - CWIP 2248 $ 17,427,611 $ 202,902 $ 202,902 1h Adair-Ottumwa - Plant in Service - No HCS 1i Adair-Ottumwa - Land - No HCS $ 656,150 $ 7,639 $ 7,639 1j Palmyra-Pawnee - CWIP 3017 $ 257,801,406 $ 3,001,467 $ 3,001,467 1k Palmyra-Pawnee - Plant in Service - No HCS $ 373,127,656 $ 4,338,216 $ 739,260 $ 4,344,159 $ 5,083,420 1l Palmyra-Pawnee - Land - No HCS $ 8,832,434 $ 102,832 $ 102,832 1m Fargo-Galesburg-Oak Grove - CWIP 3022 $ 42,876,903 $ 499,197 $ 499,197 1n Fargo-Galesburg-Oak Grove - Plant in Service - No HCS $ 42,372,371 $ 645,564 $ 110,008 $ 493,323 $ 603,331 1o Fargo-Galesburg-Oak Grove - Land - No HCS $ 3,390,446 $ 39,473 $ 39,473 1p Pawnee-Pana - CWIP 3169 $ 48,530,160 $ 565,015 $ 565,015 1q Pawnee-Pana - Plant in Service - No HCS $ 40,278,715 $ 447,736 $ 76,297 $ 468,947 $ 545,244 1r Pawnee-Pana - Land - No HCS $ 3,302,135 $ 38,445 $ 38,445 1s Adair-Palmyra - CWIP 3170 $ 21,943,097 $ 255,474 $ 255,474 1t Adair-Palmyra - Plant in Service - No HCS $ 34,035,211 $ 374,884 $ 63,883 $ 396,257 $ 460,140 1u Adair-Palmyra - Land - No HCS $ 769,449 $ 8,958 $ 8,958

Atxi 2017 Projected attachment MM ATXI Attachment MM Calculation - Page 2 (Continued) (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 11 + 11a)) (Note E) (Sum Col. 9, 12 & 13) (Note F) Sum Col. 14 & 15 (Note G) Multi-Value Projects (MVP) 1a Pana-Sugar Creek - CWIP 2237 $ 117,693,793 12.03% -0.02% $ 14,133,462 $ - $ 15,503,718 $ (1,127,150) $ 14,376,568 1b Pana-Sugar Creek - Plant in Service - No HCS $ 127,843,528 0.00% $ 15,381,589 $ 2,717,279 $ 20,002,641 $ 485,756 $ 20,488,397 1c Pana-Sugar Creek - Land - No HCS $ 4,491,478 $ 540,395 $ 592,688 $ 234,770 $ 827,458 1d Sidney-Rising - CWIP 2239 $ - $ - $ 99,590 $ 99,590 1e Sidney-Rising - Plant in Service - No HCS $ 77,394,410 $ 9,311,766 $ 1,658,224 $ 12,113,482 $ 337,959 $ 12,451,441 1f Sidney-Rising - Land - No HCS $ 1,285,913 $ 154,716 $ 169,687 $ 13,971 $ 183,658 1g Adair-Ottumwa - CWIP 2248 $ 17,427,611 $ 2,092,825 $ 2,295,727 $ (50,082) $ 2,245,645 1h Adair-Ottumwa - Plant in Service - No HCS $ - $ - 1i Adair-Ottumwa - Land - No HCS $ 656,150 $ 78,945 $ 86,584 $ 6,251 $ 92,835 1j Palmyra-Pawnee - CWIP 3017 $ 257,801,406 $ 30,958,526 $ 33,959,993 $ 4,222,083 $ 38,182,076 1k Palmyra-Pawnee - Plant in Service - No HCS $ 368,789,440 $ 44,371,174 $ 8,096,202 $ 57,550,795 $ 57,550,795 1l Palmyra-Pawnee - Land - No HCS $ 8,832,434 $ 1,062,681 $ 1,165,513 $ 80,374 $ 1,245,887 1m Fargo-Galesburg-Oak Grove - CWIP 3022 $ 42,876,903 $ 5,148,947 $ 5,648,143 $ (395,784) $ 5,252,359 1n Fargo-Galesburg-Oak Grove - Plant in Service - No HCS $ 41,726,807 $ 5,020,392 $ 801,557 $ 6,425,280 $ 6,425,280 1o Fargo-Galesburg-Oak Grove - Land - No HCS $ 3,390,446 $ 407,924 $ 447,397 $ 33,800 $ 481,197 1p Pawnee-Pana - CWIP 3169 $ 48,530,160 $ 5,827,828 $ 6,392,843 $ 841,172 $ 7,234,015 1q Pawnee-Pana - Plant in Service - No HCS $ 39,830,979 $ 4,792,294 $ 758,771 $ 6,096,309 $ 6,096,309 1r Pawnee-Pana - Land - No HCS $ 3,302,135 $ 397,299 $ 435,744 $ 117,023 $ 552,767 1s Adair-Palmyra - CWIP 3170 $ 21,943,097 $ 2,635,075 $ 2,890,548 $ (83,702) $ 2,806,846 1t Adair-Palmyra - Plant in Service - No HCS $ 33,660,327 $ 4,049,867 $ 643,644 $ 5,153,650 $ 5,153,650 1u Adair-Palmyra - Land - No HCS $ 769,449 $ 92,577 $ 101,535 $ 7,659 $ 109,194 2 MVP Total Annual Revenue Requirements $177,032,278 $4,823,690 $181,855,968 3 Rev. Req. Adj For Attachment O

Atxi 2015 attachment MM True up (b) (c) (d) (e) (f) (g) (h) (i) (j) (k)   Actual Projected Attachment MM True-Up Applicable MTEP Annual Revenues Adjustment Interest Total Line Project Revenue Allocated Principal Rate on No. Name Number Requirement 1 to Projects 1 Under/(Over) [Col. (d), line 1 x (Col. (e), line 2x / Col. (h) x Col. (i) p 2 of 2, Col. 142 Col. (e), line 3)]2 Col. (g) - Col. (f) Line 5 x 24 months 2 Col. (h) + Col. (j) 1 Actual Attachment MM revenues for True-Up Year 1 $ 66,274,859 2a Pana-Sugar Creek - CWIP 2237 15,120,908 14,038,210 12,920,582 (1,117,628) 0.0355% (9,522) (1,127,150) 2b Pana-Sugar Creek - Plant in Service - No HCS 778,416 722,679 1,204,331 481,652 4,104 485,756 2c Pana-Sugar Creek - Land - No HCS 405,274 376,255 609,042 232,787 1,983 234,770 2d Sidney-Rising - CWIP 2239 7,297,352 6,774,842 6,873,591 98,749 841 99,590 2e Sidney-Rising - Plant in Service - No HCS - 335,104 2,855 337,959 2f Sidney-Rising - Land - No HCS 183,729 170,574 184,427 13,853 118 13,971 2g Adair-Ottumwa - CWIP 2248 216,008 200,541 150,882 (49,659) (423) (50,082) 2h Adair-Ottumwa - Plant in Service - No HCS 2i Adair-Ottumwa - Land - No HCS 94,653 87,876 94,074 6,198 53 6,251 2j Palmyra-Pawnee - CWIP 3017 35,301,697 32,773,999 36,960,414 4,186,415 35,668 4,222,083 2k Palmyra-Pawnee - Plant in Service - No HCS 2l Palmyra-Pawnee - Land - No HCS 1,176,298 1,092,072 1,171,767 79,695 679 80,374 2m Fargo-Galesburg-Oak Grove - CWIP 3022 2,061,101 1,913,521 1,521,081 (392,440) (3,344) (395,784) 2n Fargo-Galesburg-Oak Grove - Plant in Service - No HCS 2o Fargo-Galesburg-Oak Grove - Land - No HCS 488,283 453,321 486,835 33,514 286 33,800 2p Pawnee-Pana - CWIP 3169 4,009,140 3,722,075 4,556,141 834,066 7,106 841,172 2q Pawnee-Pana - Plant in Service - No HCS 2r Pawnee-Pana - Land - No HCS 404,762 375,780 491,814 116,034 989 117,023 2s Adair-Palmyra - CWIP 3170 3,738,008 3,470,356 3,387,361 (82,995) (707) (83,702) 2t Adair-Palmyra - Plant in Service - No HCS 2u Adair-Palmyra - Land - No HCS 110,686 102,761 110,355 7,594 65 7,659 3 Subtotal $ 71,386,315 $ 66,274,862 $ 71,057,801 4 Under/(Over) Recovery $ 4,782,939 $ 40,751 $ 4,823,690 5 Applicable Interest rate per month (expressed to four decimal places) interest rate updated through July, 2016 Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment MM, page 2, column 15. 2 Rounded to whole dollars.

AMIL Pricing Zone Schedule 9 charge Page.Line Jan-16 Jan-17 Change Percent 1.7 AIC Adjusted Revenue Requirement 207,875,940 239,886,596 32,010,656 15% ATXI Adjusted Revenue Requirement 8,660,241 9,718,229 1,057,988 12% PPI Adjusted Revenue Requirement 7,374,750 7,322,136 -52,614 -1% Total Revenue Requirement 223,910,931 256,926,961 $33,016,030 1.15 Ameren Illinois Divisor 7,118,197 7,315,667 197,470 3% Annual Cost ($/kW/Yr) 31.46 35.12 3.66 Network & P-to-P Rate ($/kW/Mo) 2.62 2.93 0.31

Atxi 2017 Projected MVP SPEND Ameren MVPs Ameren Name 2017 CAPEX MTEP #s MTEP Description Illinois Rivers $200.2 million   2237 Pana - Mt. Zion - Kansas - Sugar Creek 345 kV line 2239 Sidney to Rising 345 kV line 3017 Palmyra-Quincy-Meredosia - Ipava & Meredosia-Pawnee 345 kV Line 3169 Pawnee to Pana - 345 kV Line 3170 New Palmyra Substation (Maywood) Spoon River $57.5 million 3022 Fargo-Galesburg-Oak Grove 345 kV Line Mark Twain $67.2 million 2248 Adair - Ottumwa 345 Adair-Palmyra 345 kV Line

Refunds will be required, but format is not yet determined ROE Complaints MISO ROE Complaints 1st Complaint (EL14-12) Covers November 12, 2013 through Feb 11, 2015 FERC order received September 28; set the Base ROE at 10.32% Applicable going forward until 2nd complaint order 2nd Complaint (EL15-45) Covers February 12, 2015 through May 11, 2016 Initial decision issued June 30th with a recommended Base ROE at 9.70% RTO Adder (ER15-358) FERC approved a 50 basis point adder for participation in an RTO Effective January 6, 2015, applicable to complaint case refunds after that date and going forward (i.e., total ROE is now 10.82%) Refunds will be required, but format is not yet determined Will impact Schedules 7,8, 9, 26, 37, 38, 26A Refund process and timing to be determined

2017 Impact of new ROE Effective September 28, 2016 2017 Projected Capital Structure Capital Structure - 2017 Projection - Posted on 8/31/16 Page.Line   $ % Cost Weighted 4.27 Long Term Debt 461,538,462 44% 4.3495% 1.9014% 4.28 Preferred Stock 0% 0.0000% 4.29 Common Stock 594,255,651 56% 12.3800% 6.9681% 4.30 Total 1,055,794,113 100% 8.8695% Capital Structure - 2017 Projection - New ROE Effective 9/28/16 10.8200% 6.0901% 7.9914% Change in Actual Return -0.8780% Hypothetical Capital Structure - 2017 Projection - New Roe Effective 9/28/16 Actual Capital Structure Return Hypothetical Capital Structure Return 7.9730% Difference applied to Attachment MM -0.0185%

2017 Impact of new ROE Effective September 28, 2016 2017 Projected Total Revenue Requirement Page.Line Posted 8/31/16 New ROE Change Percent 2.30 TOTAL RATE BASE 1,135,362,110 0% 4.30 Rate of Return on ACS 8.87% 7.99% -0.88% -10% 3.28 Return from ACS 100,700,542 90,731,508 -9,969,034 2.30a 100% CWIP RECOVERY 506,272,970 4.30e Incremental Rate of Return on HCS -0.02% 0.00% -19% 3.28a Incremental Return from HCS -115,945 -93,422 22,523 Total Return 100,584,596 90,638,086 -9,946,511 3.27 Income Taxes 52,289,795 45,700,774 -6,589,021 -13% Total Expenses Other Than Income Taxes 34,324,012 3.29 TOTAL GROSS REV. REQ. 187,198,403 170,662,872 -16,535,532 -9% 3.30 Less ATT. GG Adjustment N/A 3.30a Less ATT. MM Adjustment 177,032,278 161,191,159 -15,841,120 3.31 GROSS REV. REQ. UNDER ATT. O 10,166,125 9,471,713 -694,412 -7%

2017 Impact of new ROE Effective September 28, 2016 2017 AMIL Pricing Zone Schedule 9 Charge Page.Line posted 8/31/16 New ROE Change Percent 1.7 AIC Adjusted Revenue Requirement $239,886,596 $224,123,999 -15,762,597 -7% ATXI Adjusted Revenue Requirement $9,718,229 $9,023,817 -694,412 PPI Adjusted Revenue Requirement 7,322,136 $7,271,187 -50,949 -1% Total Revenue Requirement $256,926,961 $240,419,004 -$16,507,958 -6% 1.15 Ameren Illinois Divisor 7,315,667 0% Annual Cost ($/kW/Yr) $35.12 $32.86 -2.26 Network & P-to-P Rate ($/kW/Mo) $2.93 $2.74 -0.19

2016 Impact of new ROE Effective September 28, 2016 2016 AMIL Pricing Zone Schedule 9 Charge (Ameren Calculation, MISO has not posted the rate change yet) 09/27/2016 09/28/2016 Page.Line (12.38% ROE) (10.82% ROE) Change Percent 1.7 AIC Adjusted Revenue Requirement $207,875,940 $194,266,554 -13,609,385 -7% ATXI Adjusted Revenue Requirement $8,660,241 $7,966,789 -693,452 -8% PPI Adjusted Revenue Requirement 7,374,750 $7,280,349 -94,401 -1% Total Revenue Requirement $223,910,930 $209,513,692 -$14,397,238 -6% 1.15 Ameren Illinois Divisor 7,118,197 0% Annual Cost ($/kW/Yr) $31.46 $29.43 -2.02 Network & P-to-P Rate ($/kW/Mo) $2.62 $2.45 -0.17

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 16 https://www.misoenergy.org/Planning/TransmissionExpansionPlanning/Pages/MTEP16.aspx Schedule 26 & 26-A Indicative Charges https://www.misoenergy.org/Planning/TransmissionExpansionPlanning/Pages/MTEPStudies.aspx Additional questions on these topics can be sent to Ameren at: MISOFormulaRates@ameren.com

QUESTIONS?