1. 2018 Attachment O Projection Stakeholder Meeting
Ameren Transmission Company of Illinois
September 21, 2017

2. Purpose is to review 2018 Projected Transmission Rate Calculations
Agenda
Purpose is to review 2018 Projected Transmission Rate Calculations
Protocol Timeline
ROE Complaint Cases
ATXI 2018 Projection
Attachment O
Attachment MM
2018 AMIL Pricing Zone NITS Charge
2018 MVP Spend

3. (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

4. ROE complaints MISO ROE Complaints RTO Adder (ER15-358)
1st Complaint (EL14-12)
Covers November 12, 2013 through February 11, 2015
FERC order received September 28, 2016; 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 30, 2016; recommended Base ROE at 9.70%
Additional refunds will be required upon receipt of Final Order
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%)

5. MISO ROEs for the 2016 True-Up
ROE complaints
MISO ROEs for the 2016 True-Up
12.38% ROE for January 1 – September 27
10.82% ROE for September 28 – December 31
Refunds already provided for EL14-12
Two phase process
Phase 1 related to ROE impact on projected rates for forward looking TOs and annual updates for historical TOs. These were settled in February 2018.
2013, 2014 & 2015 projected rates from 11/12/13 to 2/11/15
Phase 2 related to the ROE impact on true-ups calculations for forward looking TOs. These were settled in June 2018.
2013, 2014 & 2015 True-ups included in 2015, 2016 and 2018 projected rates
Refunds for Schedules 7, 8, 26, 37, 38, 26A were completed by MISO
Refunds for Schedule 9 were completed by Ameren
Schedule 9 Refund amounts and supporting documents are posted on Ameren’s OASIS

6. ATXI Revenue Requirement
Projected 2017 vs Projected 2018
(Projected 2017 = Current Effective 10.82% ROE)

7. Atxi 2018 Projected Rate Base
Page.Line
2017 Projection
2018 Projection
Change
Percent
2.6
Total Gross Plant
793,570,602
1,287,715,104
494,144,502
62%
2.12
Total Accum Depreciation
19,665,259
43,663,636
23,998,378
122%
2.18
TOTAL NET PLANT
773,905,343
1,244,051,468
470,146,124
61%
2.18a
100% CWIP RECOVERY
506,272,970
179,259,075
-327,013,895
-65%
ADJUSTMENTS TO RATE BASE
2.20
Account No. 282
-215,955,048
-210,933,057
5,021,991
-2%
2.21
Account No. 283
-4,285,216
-3,795,167
490,050
-11%
2.22
Account No. 190
73,283,424
56,643,669
-16,639,756
-23%
2.25
Land Held for Future Use
N/A
2.26
CWC
1,757,484
1,841,296
83,812 5%
2.27
Materials & Supplies
2.28
Prepayments
383,153
386,923
3,770 1%
TOTAL ADJUSTMENTS
-144,816,203
-155,856,335
-11,040,132 8%
2.30
TOTAL RATE BASE
1,135,362,110
1,267,454,207
132,092,097
12%

8. ATXI 2018 Projected Expenses
Page.Line
2017 Projection
2018 Projection
Change
Percent
O&M
3.1
Transmission
2,886,648
3,022,265
135,617 5%
3.1a
Less LSE Expenses
N/A
3.2
Less Account 565
3.3
A&G
11,173,226
11,708,106
534,881
3.4
Less FERC Annual Fees
3.5
Less EPRI, ect.
185,211
26,233
-158,978
-86%
3.5a
Plus Trans. Reg. Comm. Exp
3.8
TOTAL O&M
14,059,874
14,730,372
670,498
3.12
TOTAL DEPRECIATION
17,848,671
28,881,967
11,033,296
62%
TAXES
3.13
Payroll
3.16
Property
1,770,467
3,510,160
1,739,693
98%
3.18
Other
645,000
673,000
28,000 4%
3.27
Income Taxes
45,932,062
53,535,221
7,603,159
17%
TOTAL TAXES
48,347,529
57,718,381
9,370,852
19%
TOTAL EXPENSES
80,256,074
101,330,720
21,074,646
26%

9. Atxi 2018 Projected capital structure
Capital Structure Projection
Page.Line $ %
Cost
Weighted
4.27
Long Term Debt
461,538,462
43.7%
0.0435
0.0190
4.28
Preferred Stock
0.0% -
4.29
Common Stock
594,255,651
56.3%
0.1082
0.0609
4.30
Total
1,055,794,113
100.0%
0.0799
Capital Structure Projection
550,000,000
43.8%
0.0341
0.0149
706,796,123
56.2%
0.0608
1,256,796,123
0.0758
Actual Capital Structure Return
Hypothetical Capital Structure Return
0.0756
Difference applied to Attachment MM
(0.0002)

10. ATXI 2018 Projected total revenue requirement
Page.Line
2017 Projection
2018 Projection
Change
Percent
2.30
TOTAL RATE BASE
1,135,362,110
1,267,454,207
132,092,097
12%
4.30
Rate of Return on ACS
7.99%
7.58%
-0.41%
-5%
3.28
Return from ACS
90,731,508
96,054,820
5,323,312 6%
2.30a
100% CWIP RECOVERY
506,272,970
179,259,075
-327,013,895
-65%
4.30e
Incremental Rate of Return on HCS
-0.02%
0.00%
-4%
3.28a
Incremental Return from HCS
-93,422
-31,591
61,831
-66%
Total Return
90,638,086
96,023,229
5,385,143
Total Expenses
80,256,074
101,330,720
21,074,646
26%
3.29
TOTAL GROSS REV. REQ.
170,894,160
197,353,948
26,459,789
15%
3.30
Less ATT. GG Adjustment
N/A
3.30a
Less ATT. MM Adjustment
161,412,747
188,780,017
27,367,270
17%
3.31
GROSS REV. REQ. UNDER ATT. O
9,481,413
8,573,931
-907,482
-10%

11. Atxi 2018 Projected Net Revenue Requirement & True up
Page.Line
2017 Projection
2018 Projection
Change
Percent
1.1
Gross Revenue Requirement
9,481,413
8,573,931
-907,482
-10%
1.6
Total Revenue Credits
866,750
839,201
-27,549
-3%
1.6a
Historic Year Actual ATRR
9,951,056
9,142,207
(808,849)
-8%
1.6b
Projected ATRR from Prior Year
9,757,440
8,608,134
(1,149,306)
-12%
1.6c
Prior Year ATRR True-Up
193,616
534,073
340,457
176%
1.6d
Prior Year Divisor True-Up
240,319
148,506
(91,813)
-38%
1.6e
Interest on Prior Year True-Up
3,697
11,746
8,049
218%
1.7
NET REVENUE REQUIREMENT
9,052,295
8,429,055
-623,239
-7%

12. Atxi 2016 Attachment O true uP
Ameren Transmission Company
Attachment O Load True Up (WP 8)
Year Ended December 31, 2016
Attachment O 2016 True-up calculation (Schedule 9)
2016 Rev Req at
2016 Weighted
Calculation of 2016 Weighted Attachment O Rev Req
12.38%
10.82%
Rev Req
Net Actual 2016 Rev Req (Actual Attach O, Pg 1, Line 7)
$9,298,182
$8,635,020
Percent of Actual Revenue Requirement at ROE
76.48%
23.52%
Weighted Net Actual 2016 Rev Requirement
$7,111,250
$2,030,957
$9,142,207
Net Projected 2016 Rev Req (Projected Attach O, Pg 1, Line 7)1
$8,771,234
$8,077,782
Percent of Projected Revenue at ROE
Weighted Net Projected 2016 Rev Requirement
$6,708,240
$1,899,894
$8,608,134
Under/(Over) Collection of 2016 Weighted Net Rev Req
403,010
131,063
534,073
Historic Year Actual Divisor for Transmission Owner (Attach O, Pg 1, Line 15)
6,995,394
Proj'd Yr Divisor for Transmission Owner (Projected Attach O, Pg 1, Line 15)
7,118,197
Difference between Historic & Projected Yr Divisor
122,804
Prior Year Projected Annual Cost ($ per kw per yr)
$1.2322
$1.1348
Percent of Revenue Received at ROE
Weighted Prior Yr projected Annual Cost ($ per kw per year)
$0.9424
$0.2669
$1.2093
Under/(Over) Collection of 2016 Divisor True-up
$148,507
Total Under/(Over) Recovery
682,580
Monthly Interest Rate (Over collection = FERC rate, Under collection = company rate)
0.0717%
Interest For 24 Months
$11,746
Total 2016 Attachment O True-up Under/(Over) Recovery
$ ,326

13. Atxi 2018 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 a col 5 (Note A)
1,457,160,189 1a
Transmission Accumulated Depreciation
Attach O, p 2, line 8 col 5
39,162,203 2
Net Transmission Plant - Total
Line 1 minus Line 1a (Note B)
1,417,997,986
O&M TRANSMISSION EXPENSE 3
Total O&M Allocated to Transmission
Attach O, p 3, line 8 col 5
14,730,372 3a
Transmission O&M
Attach O, p 3, line 1 col 5
3,022,265 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)
7.72%
OTHER O&M EXPENSE 4a
Other O&M Allocated to Transmission
Line 3 minus Line 3d
11,708,106 4b
Annual Allocation Factor for Other O&M
Line 4a divided by Line 1, col 3
0.80%
GENERAL AND COMMON (G&C) DEPRECIATION EXPENSE 5
Total G&C Depreciation Expense
Attach O, p 3, lines 10 & 11, col 5 (Note H)
1,683,540 6
Annual Allocation Factor for G&C Depreciation Expense
(line 5 divided by line 1 col 3)
0.12%
TAXES OTHER THAN INCOME TAXES 7
Total Other Taxes
Attach O, p 3, line 20 col 5
4,183,160 8
Annual Allocation Factor for Other Taxes
(line 7 divided by line 1 col 3)
0.29% 9
Annual Allocation Factor for Other Expense
Sum of line 4b, 6, and 8
1.21%
INCOME TAXES 10
Total Income Taxes
Attach O, p 3, line 27 col 5
53,535,221 11
Annual Allocation Factor for Income Taxes
(line 10 divided by line 2 col 3)
3.78%
RETURN 12
Return on Rate Base (Note I)
Attach O, p 3, line 28 col 5
96,054,820 13
Annual Allocation Factor for Return on Rate Base
(line 12 divided by line 2 col 3)
6.77% 14
Annual Allocation Factor for Return
Sum of line 11 and 13
10.55%
HYPOTHETICAL CAPITAL STRUCTURE (HCS) RETURN 15
Annual Allocation Factor HCS Return (Note J)
Attach O, p 4, line 30e
-0.02%

14. Atxi 2018 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
$81,159,695 $0
7.72%
1.21%
$978,867 1b
Pana-Sugar Creek - Plant in Service - No HCS
$231,563,928
$5,967,069
$460,497
$2,792,892
$3,253,389 1c
Pana-Sugar Creek - Land - No HCS
$4,491,616
$54,173 1d
Sidney-Rising - CWIP
2239 1e
Sidney-Rising - Plant in Service - No HCS
$79,813,589
$3,056,940
$235,913
$962,632
$1,198,545 1f
Sidney-Rising - Land - No HCS
$1,285,591
$15,506 1g
Adair-Ottumwa - CWIP
2248
$16,711,467
$201,557 1h
Adair-Ottumwa - Plant in Service - No HCS 1i
Adair-Ottumwa - Land - No HCS
$1,064,838
$12,843 1j
Palmyra-Pawnee - CWIP
3017 1k
Palmyra-Pawnee - Plant in Service - No HCS
$683,444,353
$16,962,205
$1,309,025
$8,243,021
$9,552,046 1l
Palmyra-Pawnee - Land - No HCS
$8,834,274
$106,550 1m
Fargo-Galesburg-Oak Grove - CWIP
3022
$67,300,620
$811,713 1n
Fargo-Galesburg-Oak Grove - Plant in Service - No HCS
$54,080,174
$1,179,513
$91,027
$652,261
$743,287 1o
Fargo-Galesburg-Oak Grove - Land - No HCS
$3,388,213
$40,865 1p
Pawnee-Pana - CWIP
3169 1q
Pawnee-Pana - Plant in Service - No HCS
$108,713,988
$2,167,757
$167,292
$1,311,199
$1,478,492 1r
Pawnee-Pana - Land - No HCS
$3,302,135
$39,827 1s
Adair-Palmyra - CWIP
3170
$14,087,292
$169,907 1t
Adair-Palmyra - Plant in Service - No HCS
$34,567,375
$1,111,444
$85,773
$416,917
$502,691 1u
Adair-Palmyra - Land - No HCS
$769,449
$9,280

15. Atxi 2018 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
Weighted 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) 1a
Pana-Sugar Creek - CWIP
2237
$81,159,695
10.55%
-0.02%
$8,547,544 $0
$9,526,411
($2,430,554)
$7,095,857 1b
Pana-Sugar Creek - Plant in Service - No HCS
$225,596,859
0.00%
$23,799,077
$5,078,506
$32,130,972
$2,187,481
$34,318,453 1c
Pana-Sugar Creek - Land - No HCS
$4,491,616
$473,838
$528,011
($16,860)
$511,151 1d
Sidney-Rising - CWIP
2239
($1,546,217) 1e
Sidney-Rising - Plant in Service - No HCS
$76,756,649
$8,097,353
$1,683,160
$10,979,058
$1,589,134
$12,568,192 1f
Sidney-Rising - Land - No HCS
$1,285,591
$135,622
$151,127
($3,839)
$147,288 1g
Adair-Ottumwa - CWIP
2248
$16,711,467
$1,760,012
$1,961,569
($152,570)
$1,808,999 1h
Adair-Ottumwa - Plant in Service - No HCS 1i
Adair-Ottumwa - Land - No HCS
$1,064,838
$112,334
$125,177
($1,953)
$123,224 1j
Palmyra-Pawnee - CWIP
3017
$4,704,783 1k
Palmyra-Pawnee - Plant in Service - No HCS
$666,482,148
$70,309,756
$14,992,702
$94,854,503
($3,531,073)
$91,323,430 1l
Palmyra-Pawnee - Land - No HCS
$8,834,274
$931,961
$1,038,512
$59,420
$1,097,932 1m
Fargo-Galesburg-Oak Grove - CWIP
3022
$67,300,620
$7,087,940
$7,899,652
($743,660)
$7,155,992 1n
Fargo-Galesburg-Oak Grove - Plant in Service - No HCS
$52,900,661
$5,580,693
$1,015,359
$7,339,340
$338,647
$7,677,987 1o
Fargo-Galesburg-Oak Grove - Land - No HCS
$3,388,213
$357,436
$398,301
($11,056)
$387,245 1p
Pawnee-Pana - CWIP
3169
($398,981) 1q
Pawnee-Pana - Plant in Service - No HCS
$106,546,231
$11,239,970
$2,311,333
$15,029,795
$983,266
$16,013,061 1r
Pawnee-Pana - Land - No HCS
$3,302,135
$348,355
$388,182
($89,034)
$299,148 1s
Adair-Palmyra - CWIP
3170
$14,087,292
$1,483,640
$1,653,547
($762,741)
$890,806 1t
Adair-Palmyra - Plant in Service - No HCS
$33,455,931
$3,529,394
$653,323
$4,685,408
$806,829
$5,492,237 1u
Adair-Palmyra - Land - No HCS
$769,449
$81,172
$90,453
($2,291)
$88,162 2
MVP Total Annual Revenue Requirements
$188,780,017
$978,731
$189,758,748 3
Rev. Req. Adj For Attachment O

16. Atxi 2016 attachment MM True up
2016 Attachment MM True-Up Adjustment - Weighted
To be completed after the Attachment MM using actual data is completed for the True-Up Year
Company Name:
ATXI
Aggregate
True-Up Year:
2016
(a)
(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
$118,545,497 2a
Pana-Sugar Creek - CWIP
2237
$18,739,217
$17,421,338
$15,031,901
-$2,389,437 $0
-$41,117
-$2,430,554 2b
Pana-Sugar Creek - Plant in Service - No HCS
$6,598,547
$6,134,489
$8,284,965
$2,150,476
$37,005
$2,187,481 2c
Pana-Sugar Creek - Land - No HCS
$647,187
$601,672
$585,097
-$16,575
-$285
-$16,860 2d
Sidney-Rising - CWIP
2239
$7,357,601
$6,840,161
$5,320,101
-$1,520,060
-$26,157
-$1,546,217 2e
Sidney-Rising - Plant in Service - No HCS
$3,765,799
$3,500,960
$5,063,211
$1,562,251
$26,883
$1,589,134 2f
Sidney-Rising - Land - No HCS
$183,954
$171,017
$167,243
-$3,774
-$65
-$3,839 2g
Adair-Ottumwa - CWIP
2248
$607,000
$564,311
$414,322
-$149,989
-$2,581
-$152,570 2h
Adair-Ottumwa - Plant in Service - No HCS 2i
Adair-Ottumwa - Land - No HCS
$93,865
$87,264
$85,344
-$1,920
-$33
-$1,953 2j
Palmyra-Pawnee - CWIP
3017
$52,940,322
$49,217,171
$53,842,364
$4,625,193
$79,590
$4,704,783 2k
Palmyra-Pawnee - Plant in Service - No HCS
$14,363,412
$13,353,272
$9,881,934
-$3,471,338
-$59,735
-$3,531,073 2l
Palmyra-Pawnee - Land - No HCS
$1,168,662
$1,086,473
$1,144,888
$58,415
$1,005
$59,420 2m
Fargo-Galesburg-Oak Grove - CWIP
3022
$6,097,868
$5,669,021
$4,937,941
-$731,080
-$12,580
-$743,660 2n
Fargo-Galesburg-Oak Grove - Plant in Service - No HCS
$844,203
$784,832
$1,117,750
$332,918
$5,729
$338,647 2o
Fargo-Galesburg-Oak Grove - Land - No HCS
$485,892
$451,721
$440,852
-$10,869
-$187
-$11,056 2p
Pawnee-Pana - CWIP
3169
$7,536,882
$7,006,833
$6,614,602
-$392,231
-$6,750
-$398,981 2q
Pawnee-Pana - Plant in Service - No HCS
$486,482
$452,269
$1,418,901
$966,632
$16,634
$983,266 2r
Pawnee-Pana - Land - No HCS
$556,817
$517,658
$430,130
-$87,528
-$1,506
-$89,034 2s
Adair-Palmyra - CWIP
3170
$4,531,940
$4,213,221
$3,463,383
-$749,838
-$12,903
-$762,741 2t
Adair-Palmyra - Plant in Service - No HCS
$397,433
$369,483
$1,162,663
$793,180
$13,649
$806,829 2u
Adair-Palmyra - Land - No HCS
$110,073
$102,332
$100,080
-$2,252
-$39
-$2,291 3
Subtotal
$127,513,156
$118,545,498
$119,507,672 4
Under/(Over) Recovery
$962,174
$16,557
$978,731 5
Applicable Interest rate per month (expressed to four decimal places)
Interest rate updated through July, 2017
0.0717%
Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment MM, page 2, column 15. 2
Rounded to whole dollars.
2016 Attachment MM True-up Adjustment Weighted ROE = &

17. AMIL Pricing Zone Schedule 9 charge
Page.Line
2017 Projection
2018 Projection
Change
Percent
1.7
AIC Adjusted Revenue Requirement
223,599,780
261,107,013
37,507,233
17%
ATXI Adjusted Revenue Requirement
9,052,295
8,429,056
-623,239
-7%
PPI Adjusted Revenue Requirement
7,271,187 0%
Total Revenue Requirement
239,923,262
276,807,255
$36,883,993
15%
1.15
Ameren Illinois Divisor
7,315,667
7,304,167
-11,500
Annual Cost ($/kW/Yr)
32.80
37.90
5.10
16%
Network & P-to-P Rate ($/kW/Mo)
2.73
3.16
0.43
PPI’s 2018 revenue requirement is not required to be posted until 10/1/17 so the PPI current revenue requirement is shown above for both years.

18. Atxi 2018 Projected MVP SPEND
Ameren MVPs
Ameren Name
2018 CAPEX
MTEP #s
MTEP Description
Illinois Rivers
$45.6 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 kV Line
3170
New Palmyra Substation (Maywood)
Spoon River
$5.3 million
3022
Fargo-Galesburg-Oak Grove 345 kV Line
Mark Twain
$38.7 million
2248
Adair - Ottumwa 345
Adair-Palmyra 345 kV Line

19. Appendix - Miso web links
Transmission Pricing - Attachments O, GG & MM Information
Ameren OASIS
MTEP 17
Schedule 26 & 26-A Indicative Charges
Additional questions on these topics can be sent to Ameren at:

20. QUESTIONS?