1. 2017 Attachment O True-Up Stakeholder Meeting
Ameren Transmission Company of Illinois
August 6, 2018

2. Purpose is to review ATXI 2017 Transmission Rate True-Up Calculations
Agenda
Purpose is to review ATXI 2017 Transmission Rate True-Up Calculations
Protocol Timeline
Attachment O Template Changes
ROE Complaint Cases and Impact on True-up calculations
2017 True Up Calculation
Total Revenue Requirement Comparison – Projected vs Actual
Attachment O/Schedule 9 True-up
Attachment MM/Schedule 26-A True-up
2017 MVP Spend
2017 Significant Projects Placed In Service
An additional meeting will held to review the 2019 Projected Transmission Rate calculations. Tentatively set for September 25, 2018.

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. ATXI Attachment O tariff Changes
Docket ER
FERC Order on May 31, 2018
Effective January 1, 2018 for ATXI
Approved additional lines in the Income Tax Section (Page 3, Lines 24a/24b and 26a/26b)
Modification to return to (or recover from) customers excess (or deficient) accumulated deferred income taxes (ADIT) resulting from tax law or rate changes
An adjustment to recognize the effects of permanent differences between tax accounting and financial reporting, such as those associated with the equity component of Allowance for Funds Used During Construction (AFUDC) Equity
Revised 2017 Annual True-Up including these changes was posted on Ameren’s OASIS
These tariff changes resulted in decreases of $14,165 and $348,591 to the Net Attachment O revenue requirement and Attachment MM revenue requirement, respectively

5. 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 may 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%)

6. MISO ROEs for the 2017 True-Up
ROE complaints
MISO ROEs for the 2017 True-Up
10.82% ROE for January 1 – 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 2017.
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 2017.
2013, 2014 & 2015 True-ups included in 2015, 2016 and 2017 projected rates
Refunds for Schedules 7, 8, 26, 37, 38, 26A were completed by MISO
Refunds for Schedule 9 were processed by Ameren
Schedule 9 Refund amounts and supporting documents are posted on Ameren’s OASIS

7. ATXI Revenue Requirement Comparison
Projected 2017 vs Actual 2017

8. Atxi 2017 Rate Base Page.Line 2017 Proj 2017 Act Change Percent 2.6
Total Gross Plant
793,570,602
837,949,452
44,378,850 6%
2.12
Total Accum Depreciation
19,665,259
19,607,016
(58,242) 0%
2.18
TOTAL NET PLANT
773,905,343
818,342,435
44,437,092
2.18a
100% CWIP RECOVERY
506,272,970
462,578,129
(43,694,840)
-9%
ADJUSTMENTS TO RATE BASE
2.20
Account No. 282
(215,955,048)
(174,249,594)
41,705,454
-19%
2.21
Account No. 283
(4,285,216)
(2,933,339)
1,351,877
-32%
2.22
Account No. 190
73,283,424
52,581,762
(20,701,663)
-28%
2.25
Land Held for Future Use -
N/A
2.26
CWC
1,757,484
1,565,210
(192,274)
-11%
2.27
Materials & Supplies
2.28
Prepayments
383,153
369,399
(13,754)
-4%
TOTAL ADJUSTMENTS
(144,816,203)
(122,666,562)
22,149,641
-15%
2.30
TOTAL RATE BASE
1,135,362,110
1,158,254,003
22,891,893 2%

9. ATXI 2017 Expenses
Page.Line
2017 Proj
2017 Act
Change
Percent
O&M
3.1
Transmission
2,886,648
3,309,758
423,110
15%
3.1a
Less LSE Expenses -
N/A
3.2
Less Account 565
3.3
A&G
11,173,226
9,211,923
(1,961,302)
-18%
3.4
Less FERC Annual Fees
3.5
Less EPRI, ect.
185,211
50,877
(134,334)
-73%
3.5a
Plus Trans. Reg. Comm. Exp
3.8
TOTAL O&M
14,059,874
12,521,681
(1,538,192)
-11%
3.12
TOTAL DEPRECIATION
17,848,671
16,732,540
(1,116,131)
-6%
TAXES
3.13
Payroll
3.16
Property
1,770,467
2,667,950
897,483
51%
3.18
Other
645,000
460,479
(184,521)
-29%
3.27
Income Taxes *
45,932,062
47,381,409
1,449,348 3%
TOTAL TAXES
48,347,529
50,509,838
2,162,310 4%
TOTAL EXPENSES
80,256,074
79,764,060
(492,014)
-1%
* The 2017 actual income taxes include the adjustments related to Docket ER (discussed on slide 4).

10. Atxi 2017 capital structure
Actual Capital Structure Projection
Hypothetical Capital Structure Projection
Page.Line $ %
Cost
Weighted
Actual Capital Structure Return
7.9914%
4.27
Long Term Debt
461,538,462
44%
4.3495%
1.9014%
Hypothetical Capital Structure Return
7.9730%
4.28
Preferred Stock 0%
0.0000%
Difference applied to Attachment MM %
4.29
Common Stock
594,255,651
56% %
6.0901%
4.3
Total
1,055,794,113
100%
Actual Capital Structure Actual
Hypothetical Capital Structure Actual
7.6407%
442,307,692
3.5855%
1.5757%
7.6368% %
564,164,173
6.0650%
1,006,471,865
Change in Actual Return %
Change in Hypothetical Return %

11. ATXI 2017 total revenue requirement
Page.Line
2017 Proj
2017 Act
Change
Percent
2.30
TOTAL RATE BASE
1,135,362,110
1,158,254,003
22,891,893 2%
4.30
Rate of Return on ACS
7.99%
7.64%
-0.35%
-4%
3.28
Return from ACS
90,731,508
88,498,816
(2,232,692)
-2%
2.30a
100% CWIP RECOVERY
506,272,970
462,578,129
(43,694,840)
-9%
4.30e
Incremental Rate of Return on HCS
-0.02%
0.00%
0.01%
-79%
3.28a
Incremental Return from HCS
(93,422)
(17,953)
75,469
-81%
Total Return
90,638,086
88,480,863
(2,157,223)
Total Expenses
80,256,074
79,764,060
(492,014)
-1%
3.29
TOTAL GROSS REV. REQ.
170,894,160
168,244,923
(2,649,237)
3.30
Less ATT. GG Adjustment -
N/A
3.30a
Less ATT. MM Adjustment
161,412,747
159,706,197
(1,706,550)
3.31
GROSS REV. REQ. UNDER ATT. O
9,481,413
8,538,726
(942,687)
-10%

12. Atxi 2017 Net Revenue Requirement For Schedule 9
Page.Line
2017 Proj
2017 Act
Change
Percent
1.1
Gross Revenue Requirement
9,481,413
8,538,726
(942,687)
-10%
1.6
Total Revenue Credits
866,750
915,219
48,469 6%
1.6a
Historic Year Actual ATRR
9,951,056
(0) 0%
1.6b
Projected ATRR from Prior Year
9,757,440
1.6c
Prior Year ATRR True-Up
193,616 -
1.6d
Prior Year Divisor True-Up
240,319
237,811
(2,508)
-1%
1.6e
Interest on Prior Year True-Up
3,697
6,206
2,509
68%
1.7
NET REVENUE REQUIREMENT
9,052,295
8,061,139
(991,155)
-11%

13. ATXI 2017 attachment o true up for Schedule 9
Attachment O 2017 True-up calculation (Schedule 9)
Net Actual 2017 Rev Req (Actual Attach O, Pg 1, Line 7)
$8,061,139
Net Projected 2017 Rev Req (Projected Attach O, Pg 1, Line 7)
$9,052,295
Under/(Over) Collection of 2017 Net Rev Req
($991,156)
Historic Year Actual Divisor for Transmission Owner (Attach O, Pg 1, Line 15)
6,859,419
Proj'd Yr Divisor for Transmission Owner (Projected Attach O, Pg 1, Line 15)
7,315,667
Difference between Historic & Projected Yr Divisor
456,248
Prior Year Projected Annual Cost ($ per kw per yr)
$1.2374
Under/(Over) Collection of 2017 Divisor True-up
$564,561
Total Under/(Over) Recovery
($426,595)
Monthly Interest Rate (Over collection = FERC rate, Under collection = company rate)
0.3260%
Interest For 24 Months
($33,377)
Total 2017 Attachment O True-up Under/(Over) Recovery (To be included in Projected 2019)
($459,972)

14. ATXI 2017 attachment MM true-up by project

15. ATXI 2017 attachment MM true-up for Schedule 26-A
Attachment MM 2017 True-up (Schedule 26-A)
Actual Attachment MM Rev Req for True-Up Year (Actual Attach MM, pg 2, col 14) 1
$159,706,197
Actual Attachment MM Revenues for 20171
$149,703,040
Under/(Over) Recovery of 2017 MM Rev Req
$10,003,157
Monthly Interest Rate (Over collection = FERC rate, Under collection = company rate)
0.0993%
Interest For 24 Months
$238,395
Total 2017 Attachment MM True-up Under/(Over) Recovery
$10,241,552
1 Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment MM, page 2, column 15.

16. Atxi 2017 MVP SPEND Ameren MVPs Ameren Name 2017 CAPEX MTEP #s
MTEP Description
Illinois Rivers
$205 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
$56 million
3022
Fargo-Galesburg-Oak Grove 345 kV Line
Mark Twain
$5 million
2248
Adair - Ottumwa 345
Adair-Palmyra 345 kV Line

17. MVP Facilities status with In-service Dates
Illinois Rivers
Substations
Line Segments
Kansas
Oct-15
Sidney-Rising
Sep-16
Sidney
Nov-15
Faraday-Pana
Oct-16
Rising
Herleman-Maywood
Pana
Meredosia-Herleman
Faraday
Austin-Meredosia
Sep-17
Herleman
Pana-Austin
Oct-17
Maywood
Meredosia-Ipava
Dec-17
Meredosia
Faraday-Kansas
Apr-18
Ipava
May-17
Kansas-Sugar Creek
2019
Austin
River Crossings
Maywood-Herleman
Herleman-Meredosia
Spoon River
Mark Twain
Fargo Substation
May-16
Zachary Substation
Sandburg Substation
Mar-17
Maywood-Zachary
Sandburg-Fargo
Feb-18
Maywood-Ottumwa

18. Additional information
Additional questions can be sent to Ameren at:
MISO Web Links
Transmission Pricing - Attachments O, GG & MM Information
Ameren OASIS
MTEP 18
MTEP 17
Schedule 26 & 26-A Indicative Charges