1. 2018 Attachment O True-Up Stakeholder Meeting
Ameren Transmission Company of Illinois
July 16, 2019

2. Purpose is to review ATXI 2018 Transmission Rate True-Up Calculations
Agenda
Purpose is to review ATXI 2018 Transmission Rate True-Up Calculations
Protocol Timeline
Attachment O Template Changes
ROE Complaint Cases and Impact on True-up calculations
2018 True-Up Calculation
Total Revenue Requirement Comparison – Projected vs Actual
Attachment O/Schedule 9 True-up
Attachment MM/Schedule 26-A True-up
2018 MVP Spend
2018 Significant Projects Placed In Service
An additional meeting will held to review the 2020 Projected Transmission Rate calculations.

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 November 5, 2018
Effective February 14, 2018 for ATXI
The incentive return and income taxes was weighted for the number of days in effect for 2018 ~ 321 days.
Approved 50 basis point adder for Mark Twain Component of the Grand Rivers Project
Added a page 3 to Attachment MM to calculate the Incremental Return and Income Taxes for 100 basis point increase in ROE per dollar of Net Transmission Plant
Added a column on Attachment MM page 2
Modified Attachment O page 3, to include the ROE incentive return and income taxes in the total revenue requirement
Docket ER
FERC Order on December 20, 2018
Effective January 1, 2019, but also applicable to the 2018 true-up
Approved removing double averaging on the ADIT work paper
The term double averaging or two-step averaging methodology refers to the application of the IRS proration methodology together with an additional averaging step

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 2018 True-Up
ROE complaints
MISO ROEs for the 2018 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 2018 vs Actual 2018

8. Atxi 2018 Rate Base Page.Line 2018 Proj 2018 Act Change Percent 2.6
Total Gross Plant
1,287,715,104
1,337,399,221
49,684,117 4%
2.12
Total Accum Depreciation
43,663,636
40,469,645
(3,193,992)
-7%
2.18
TOTAL NET PLANT
1,244,051,468
1,296,929,577
52,878,109
2.18a
100% CWIP RECOVERY
179,259,075
133,874,635
(45,384,439)
-25%
ADJUSTMENTS TO RATE BASE
2.20
Account No. 282
(210,933,057)
(230,183,340)
(19,250,283) 9%
2.21
Account No. 283
(3,795,167)
(4,404,062)
(608,896)
16%
2.22
Account No. 190
56,643,669
47,838,869
(8,804,800)
-16%
2.25
Land Held for Future Use -
N/A
2.26
CWC
1,841,296
1,668,284
(173,012)
-9%
2.27
Materials & Supplies
2.28
Prepayments
386,923
352,448
(34,475)
TOTAL ADJUSTMENTS
(155,856,335)
(184,727,801)
(28,871,466)
19%
2.30
TOTAL RATE BASE
1,267,454,207
1,246,076,410
(21,377,797)
-2%

9. ATXI 2018 Expenses Page.Line 2018 Proj 2018 Act Change Percent O&M 3.1
Transmission
3,022,265
3,770,448
748,183
25%
3.1a
Less LSE Expenses -
N/A
3.2
Less Account 565
3.3
A&G
11,708,106
9,575,824
(2,132,282)
-18%
3.4
Less FERC Annual Fees
3.5
Less EPRI, etc.
26,233
143,754
117,521
448%
3.5a
Plus Trans. Reg. Comm. Exp
3.8
TOTAL O&M
14,730,372
13,346,272
(1,384,100)
-9%
3.12
TOTAL DEPRECIATION
28,881,967
26,496,929
(2,385,038)
-8%
TAXES
3.13
Payroll
3.16
Property
3,510,160
716,707
(2,793,453)
-80%
3.18
Other
673,000
640,053
(32,947)
-5%
3.27
Income Taxes
30,388,622
28,976,884
(1,411,738)
TOTAL TAXES
34,571,782
30,333,644
(4,238,138)
-12%
TOTAL EXPENSES
78,184,121
70,176,845
(8,007,276)
-10%

10. Atxi 2018 capital structure

11. ATXI 2018 total revenue requirement
Page.Line
2018 Proj
2018 Act
Change
Percent
2.30
TOTAL RATE BASE
1,267,454,207
1,246,076,410
(21,377,797)
-2%
4.30
Rate of Return on ACS
7.58%
7.69%
0.11% 1%
3.28
Return from ACS
96,054,820
95,784,293
(270,527) 0%
2.30a
100% CWIP RECOVERY
179,259,075
133,874,635
(45,384,439)
-25%
4.30e
Incremental Rate of Return on HCS
-0.02%
-0.01%
0.01%
-40%
3.28a
Incremental Return from HCS
(31,591)
(14,061)
17,530
-55%
3.28b
ROE incentive Mark Twain -
142,312
N/A
Total Return
96,023,229
95,912,545
(110,684)
Total Expenses
78,184,121
70,176,845
(8,007,276)
-10%
3.29
TOTAL GROSS REV. REQ.
174,207,349
166,089,390
(8,117,960)
-5%
3.30
Less ATT. GG Adjustment
3.30a
Less ATT. MM Adjustment
166,512,669
158,942,692
(7,569,977)
3.31
GROSS REV. REQ. UNDER ATT. O
7,694,680
7,146,698
(547,983)
-7%

12. Atxi 2018 Net Revenue Requirement For Schedule 9
Page.Line
2018 Proj
2018 Act
Change
Percent
1.1
Gross Revenue Requirement
7,694,680
7,146,698
(547,983)
-7%
1.6
Total Revenue Credits
839,201
1,034,750
195,549
23%
1.6a
Historic Year Actual ATRR
9,142,207 - 0%
1.6b
Projected ATRR from Prior Year
8,608,134
1.6c
Prior Year ATRR True-Up
534,073
1.6d
Prior Year Divisor True-Up
148,506
1.6e
Interest on Prior Year True-Up
11,746
1.7
NET REVENUE REQUIREMENT
7,549,805
6,806,273
(743,532)
-10%

13. ATXI 2018 attachment o true-up for Schedule 9
Attachment O 2018 True-up Calculation (Schedule 9)
Net Actual 2018 Rev Req (Actual Attach O, Pg 1, Line 7)
$6,806,273
Net Projected 2018 Rev Req (Projected Attach O, Pg 1, Line 7)
$7,549,805
Under/(Over) Collection of 2018 Net Rev Req
($743,532)
Historic Year Actual Divisor for Transmission Owner (Attach O, Pg 1, Line 15)
7,199,027
Proj'd Yr Divisor for Transmission Owner (Projected Attach O, Pg 1, Line 15)
7,176,333
Difference between Historic & Projected Yr Divisor
(22,694)
Prior Year Projected Annual Cost ($ per kw per yr)
$1.0520
Under/(Over) Collection of 2018 Divisor True-up
($23,874)
Total Under/(Over) Recovery
($767,406)
Monthly Interest Rate (Over collection = FERC rate, Under collection = company rate)
0.3900%
Interest For 24 Months
($71,829)
Total 2018 Attachment O True-up Under/(Over) Recovery (To be included in Projected 2020)
($839,235)

14. ATXI 2018 attachment MM true-up by project

15. ATXI 2018 attachment MM true-up for Schedule 26-A
Attachment MM 2018 True-up Calculation (Schedule 26-A)
Actual 2018 Attachment MM Rev Req (Actual Attach MM, pg 2, col 14) 1
$158,942,692
Actual Attachment MM Revenues for 20181
$155,696,149
Under/(Over) Recovery of 2018 MM Rev Req
$3,246,543
Monthly Interest Rate (Over collection = FERC rate, Under collection = company rate)
0.2030%
Interest For 24 Months
$158,172
Total 2018 Attachment MM True-up Under/(Over) Recovery (To be included in Projected 2020)
$3,404,715
1 Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment MM, page 2, column 15.

16. Atxi 2018 MVP SPEND Ameren MVPs Ameren Name 2018 CAPEX MTEP #s
MTEP Description
Illinois Rivers
$18 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
$4 million
3022
Fargo-Galesburg-Oak Grove 345 kV Line
Mark Twain
$81 million
2248
Zachary Ottumwa 345
Maywood - Zachary 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
2020
Austin
River Crossings
Maywood-Herleman
Herleman-Meredosia
Spoon River
Mark Twain
Fargo Substation
May-16
Zachary Substation
Jun-19
Sandburg Substation
Mar-17
Zachary-Ottumwa
Sandburg-Fargo
Feb-18
Maywood-Zachary
Dec-19

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