1. 2016 Attachment O True-Up Stakeholder Meeting Ameren Illinois Company
July 12, 2017

2. Purpose is to review AIC 2016 Transmission Rate True-Up Calculations
Agenda
Purpose is to review AIC 2016 Transmission Rate True-Up Calculations
Protocol Timeline
ROE Complaint Cases and Impact on True-up calculations
2016 True Up Calculation
Total Revenue Requirement Comparison – Projected vs Actual
Summary of Revenue Requirements at 12.38% and 10.82% ROE
Attachment O/Schedule 9 Weighted True-up
Attachment GG/Schedule 26 Weighted True-up
Attachment MM/Schedule 26-A Weighted True-up
2016 MVP Spend
2016 Significant Projects Placed In Service
An additional meeting will held to review the 2018 Projected Transmission Rate calculations. Tentatively set for September 19, 2017.

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 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 completed by Ameren
Schedule 9 Refund amounts and supporting documents are posted on Ameren’s OASIS

6. Aic 2016 ROE Weightings
2016 ROE Weightings - Schedule 9, 26 & 26A
Per FERC's 9/28/16 Order in EL14-12, the ROE was revised from 12.38% to 10.32% (plus adders as applicable)
effective 9/28/16. The table below calculates the percentage of the year 2016 applicable to each ROE. These percentages are used to prorate the 2016 revenue requirement..
Schedule 9
Days in Month
Total Peak
Prorated
Schedule 26
Schedule 26-A
Total
Effective
In Month
Peaks %
Revenue
Monthly %
January 31
6,892
1,271,595
9.361%
February 29
6,583
1,139,012
8.748%
March
6,028
1,141,297
8.429%
April 30
5,391
1,056,305
7.455%
May
6,289
1,195,729
7.905%
June
8,295
1,427,881
8.587%
July
8,686
1,606,617
9.601%
August
8,489
1,600,616
9.258%
September 27
8,382
64,198
76.48%
1,423,760
77.37%
8.602%
77.09%
September 3
October
6,539
1,084,005
7.776%
November
5,546
1,017,862
7.684%
December
6,823
19,747
23.52%
1,184,593
22.63%
6.593%
22.91%
83,945
100.00%
15,149,272 %
12.38%
10.82%
Schedule 9 has been weighted based on the actual 2016 Load in the AMIL pricing zone
Schedule 26 has been weighted on the actual Schedule 26 revenue related to the 2016 Projected revenue requirement
Schedule 26-A has been weighted on the monthly percentage of applicable withdrawals from the prior year consistent with the monthly allocation of the total MVP revenue requirement
September load and revenue split based on number of days (i.e., 27 days at 12.38% and 3 days at 10.82%)

7. AIC Revenue Requirement Comparison
Projected 2016 vs Actual 2016
(Complete 2016 True-ups calculations with ROE at % and 10.32% are included in the posted file.)

8. Aic 2016 rate base 2016 Projection 2016 Actual Change Percent 2.6
Page.Line
2016 Projection
2016 Actual
Change
Percent
2.6
Total Gross Plant
1,938,342,678
1,955,115,691
16,773,013 1%
2.12
Total Accum Depreciation
502,413,116
489,351,078
-13,062,038
-3%
2.18
TOTAL NET PLANT
1,435,929,562
1,465,764,613
29,835,051 2%
2.18a
100% CWIP RECOVERY
42,507,018
32,909,248
-9,597,771
-23%
ADJUSTMENTS TO RATE BASE
N/A
2.20
Account No. 282
-388,199,066
-402,659,776
-14,460,711 4%
2.21
Account No. 283
-7,813,781
-9,938,863
-2,125,082
27%
2.22
Account No. 190
54,136,112
45,856,129
-8,279,983
-15%
2.23
Account No. 255
2.25
Land Held for Future Use
2,363,868
2,466,349
102,481
2.26
CWC
5,834,598
6,038,490
203,892 3%
2.27
Materials & Supplies
12,101,199
14,469,755
2,368,556
20%
2.28
Prepayments
1,491,166
1,554,677
63,511
TOTAL ADJUSTMENTS
-320,085,904
-342,213,241
-22,127,337 7%
2.30
TOTAL RATE BASE
1,158,350,676
1,156,460,620
-1,890,056 0%

9. Aic 2016 expenses 2016 Projection 2016 Actual Change Percent O&M 3.1
Page.Line
2016 Projection
2016 Actual
Change
Percent
O&M
3.1
Transmission
47,078,280
55,509,642
8,431,362
18%
3.1a
Less LSE Expenses
1,495,616
1,650,984
155,368
10%
3.2
Less Account 565
13,231,075
19,509,499
6,278,424
47%
3.3
A&G
14,176,890
13,874,977
-301,912
-2%
3.4
Less FERC Annual Fees
N/A
3.5
Less EPRI, ect.
362,566
200,919
-161,646
-45%
3.5a
Plus Trans. Reg. Comm. Exp
510,870
284,703
-226,167
-44%
3.8
TOTAL O&M
46,676,783
48,307,921
1,631,137 3%
3.12
TOTAL DEPRECIATION
35,645,227
36,407,698
762,471 2%
TAXES
3.13
Payroll
892,102
737,783
-154,319
-17%
3.16
Property
1,216,554
1,284,806
68,252 6%
3.18
Other
421,926
342,506
-79,420
-19%
3.27
Income ROE
43,674,692
43,701,611
26,919 0%
TOTAL TAXES
46,205,273
46,066,705
-138,568
TOTAL EXPENSES
128,527,284
130,782,324
2,255,040
Income Taxes based on 12.38% ROE were 49,941,009 for projected and 49,971,931 for actuals resulting in Total Expenses of 134,793,601 for projected and 137,052,645 for actuals.

10. Aic 2016 Capital structure (12.38% and 10.82% ROE)
% ROE
Page.Line $ %
Cost
Weighted
4.27
Long Term Debt
2,436,021,670
47%
0.0570
0.0267
4.28
Preferred Stock
61,721,350 1%
0.0490
0.0006
4.29
Common Stock
2,698,856,348
52%
0.1238
0.0643
4.30
Total
5,196,599,368
100%
0.0916
% ROE
2,427,922,000
0.0568
0.0266
61,632,375
0.0491
2,706,457,409
0.0645
5,196,011,784
Change in Return
0.0010%
% ROE
0.1082
0.0562
0.0835
% ROE
0.0564 %

11. Aic 2016 total revenue requirement
12.38% ROE
Page.Line
Projected
Actual
Change
Percent
2.30
TOTAL RATE BASE
1,158,350,676
1,156,460,620
-1,890,056 0%
4.30
Rate of Return
9.16%
0.00%
3.28
Return
106,113,678
105,952,605
-161,073
Total Expenses
134,793,601
137,052,645
2,259,043 2%
3.29
TOTAL GROSS REV. REQ.
240,907,279
243,005,249
2,097,970 1%
3.30
Less ATT. GG Adjustment
14,686,344
15,166,954
480,610 3%
3.30a
Less ATT. MM Adjustment
11,861,659
11,111,510
-750,149
-6%
3.31
GROSS REV. REQ. UNDER ATT. O
214,359,276
216,726,785
2,367,510
10.82% ROE
8.35%
96,728,874
96,555,663
-173,211
128,527,284
130,782,324
2,255,040
225,256,158
227,337,987
2,081,829
13,650,271
14,112,771
462,500
10,855,997
10,184,621
-671,377
200,749,890
203,040,596
2,290,706

12. Aic 2016 Net revenue requirement for Schedule 9
12.38% ROE
Page.Line
Projected
Actual
Change
Percent
1.1
Gross Revenue Requirement
214,359,276
216,726,785
2,367,510 1%
1.6
Total Revenue Credits
13,373,302
11,346,144
-2,027,158
-15%
1.6a
Historic Year Actual ATRR
139,652,172 0%
1.6b
Projected ATRR from Prior Year
130,545,024
1.6c
Prior Year ATRR True-Up
9,107,148
1.6d
Prior Year Divisor True-Up
(2,971,336)
1.6e
Interest on Prior Year True-Up
743,038
1.7a
NET REVENUE REQUIREMENT
207,864,823
212,259,491
4,394,668 2%
1.7b
Prairie Power
N/A
1.7
AIC Adjusted Revenue Requirement
10.82% ROE
200,749,890
203,040,596
2,290,706
194,255,438
198,573,302
4,317,864 .
Prior year true-ups shown above represent the 2014 revised true-up at 10.32% ROE as a result of the Order in Docket EL The 2014 true –up at 12.38% ROE was originally included in 2016 rates.

13. Attachment O, GG & MM Revenue Requirement Summary
12.38% ROE
Projected
Actual
Change
Percent
Total Revenue Requirement
240,907,279
243,005,249
2,097,970
0.9%
Less Attachment GG Rev Req
14,686,344
15,166,954
480,610
3.3%
Less Attachment MM Rev Req
11,861,659
11,111,510
-750,149
-6.3%
Gross Attachment O Rev Req
214,359,276
216,726,785
2,367,510
1.1%
Less Revenue Credits
13,373,302
11,346,144
-2,027,158
-15.2%
Plus Total Prior Year True-up
6,878,850
0.0%
Net Attachment O Rev Req
207,864,823
212,259,491
4,394,668
2.1%
10.82% ROE
225,256,158
227,337,987
2,081,829
13,650,271
14,112,771
462,500
3.4%
10,855,997
10,184,621
-671,377
-6.2%
200,749,890
203,040,596
2,290,706
194,255,438
198,573,302
4,317,864
2.2%
Shaded cells used in True-up calculations
Prior year true-ups shown above represent the 2014 revised true-up at 10.32% ROE as a result of the Order in Docket EL The 2014 true –up at 12.38% ROE was originally included in 2016 rates.

14. Aic 2016 attachment o true up for Schedule 9
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)
$212,259,491
$198,573,302
Percent of Actual Revenue Requirement at ROE
76.48%
23.52%
Weighted Net Actual 2016 Rev Requirement
$162,336,059
$46,704,441
$209,040,500
Net Projected 2016 Rev Req (Projected Attach O, Pg 1, Line 7)
$207,864,823
$194,255,438
Percent of Projected Revenue at ROE
Weighted Net Projected 2016 Rev Requirement
$158,975,017
$45,688,879
$204,663,896
Under/(Over) Collection of 2016 Weighted Net Rev Req
$3,361,042
$1,015,562
$4,376,604
Historic Year Actual Divisor for Transmission Owner (Attach O, Pg 1, Line 15)
6,995,394
Proj'd Yr Divisor for Transmission Owner (Projected Attach O, Pg 1, Line 15)
7,118,197
Difference between Historic & Projected Yr Divisor
122,804
Prior Year Projected Annual Cost ($ per kw per yr) $ $
Percent of Revenue Received at ROE
Weighted Prior Yr projected Annual Cost ($ per kw per year) $
$6.4186 $
Under/(Over) Collection of 2016 Divisor True-up
$3,530,885
Total Under/(Over) Recovery
$7,907,489
Monthly Interest Rate (Over collection = FERC rate, Under collection = company rate)
0.0537%
Interest For 24 Months
$101,912
Total 2016 Attachment O True-up Under/(Over) Recovery
$8,009,401

15. Aic 2016 attachment o true up for Schedule 26 & 26-A
Attachment GG 2016 True-up ( Schedule 26)
2016 Rev Req at
2016 Weighted Actual
Calculation of Weighted Rev Req for 2016 True-up
12.38%
10.82%
Rev Req
Actual Attachment GG Rev Req for True-Up Year (Actual Attach GG, pg 2, col 10) 1
$15,166,954
$14,112,771
Percent of Actual Revenue Requirement at ROE
77.37%
22.63%
Weighted Actual Attachment GG Rev Req for 2016 True-Up
$11,734,672
$3,193,720
$14,928,392
Actual Attachment GG Revenues Received for 20161
$14,774,285
Under/(Over) Recovery of 2016 GG Rev Req
$154,107
Monthly Interest Rate (Over collection = FERC rate, Under collection = company rate)
0.0537%
Interest For 24 Months
$1,986
Total 2016 Attachment GG True-up Under/(Over) Recovery
$156,093
1 Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment GG, page 2, column 11.
Attachment MM 2016 True-up (Schedule 26-A)
2016 Weighted Actual Rev Req
Calculation of Weighted Rev Req for Revised 2016 True-up
Actual Attachment MM Rev Req for True-Up Year (Actual Attach GG, pg 2, col 14) 1
$11,111,510
$10,184,621
77.09%
22.91%
Weighted Actual Attachment MM Rev Req for 2016 True-Up
$8,565,863
$2,333,297
$10,899,160
Actual Attachment MM Revenues for 20161
$10,755,044
Under/(Over) Recovery of 2016 MM Rev Req
$144,116
$1,857
Total 2016 Attachment MM True-up Under/(Over) Recovery
$145,973
1 Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment MM, page 2, column 15.

16. Aic 2016 attachment gg True-up for Schedule 26
AIC 2016 Weighted Attachment GG True Up by Project
2016 Attachment GG True-Up Adjustment - Weighted ROE
Company Name:
AIC
True-Up Year:
2016
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
(k)
Actual
Projected
Attachment GG
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. 102
Col. (e), line 3)]2
Col. (g) - Col. (f)
Line 5
x 24 months 2
Col. (h) + Col. (j) 1
Actual Attachment GG revenues for True-Up Year 1
$ ,774,285 2a
Wood River-Roxford kV line
728
$ ,665
$ ,942
$ ,715
$ (15,227)
0.0537%
$ (196)
$ (15,423) 2b
Sidney-Paxton 138kV Reconductor 18 miles
870
$ ,523
$ ,560
$ ,948
$ (26,612)
$ (343)
$ (26,955) 2c
Coffeen Plant-Coffeen, North - 2nd. Bus tie
2829
$ ,231
$ ,882
$ ,245
$ (21,637)
$ (279)
$ (21,916) 2d
Latham - Oreana 8.5 mile 345kV line
2068
$ ,453,281
$ ,530,320
$ ,439,878
$ (90,442)
$ (1,166)
$ (91,608) 2e
Brokaw-S. Bloom 345/138kV Trans & 345kV line
2069
$ ,418,811
$ ,517,390
$ ,535,858
$ ,468 $
$ ,706 2f
Fargo-Mapleridge-20 mile 345kV line & New Sub
2472
$ ,519,369
$ ,620,191
$ ,909,750
$ ,559
$ ,732
$ ,291 3
Subtotal
$ ,451,880
$ ,774,285
$ ,928,394 4
Under/(Over) Recovery
$ ,109
$ ,986
$ ,095 5
Applicable Interest rate per month (expressed to four decimal places)
Interest Rate to be updated through July 2017
Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment GG, page 2, column 11. 2
Rounded to whole dollars.

17. Aic 2016 attachment MM true-up for Schedule 26-A
AIC 2016 Weighted Attachment MM True Up by Project
2016 Attachment MM True-Up Adjustment – Weighted ROE
Company Name:
AIC
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
$ ,755,044 2a
Pana-Sugar Creek - CWIP
2237
$ ,220,811
$ ,053,511
$ ,755,088
$ (298,423)
0.0537%
$ (3,846)
$ (302,269) 2b
Pana-Sugar Creek - Plant in Service
$ ,725,322
$ ,520,015
$ ,453,499
$ (66,516)
$ (857)
$ (67,373) 2c
Sidney-Rising - CWIP
2239
$ ,307
$ ,647
$ ,859
$ ,212 $
$ ,408 2d
Sidney-Rising - Plant in Service
$ ,258
$ ,520
$ ,751
$ ,231
$ ,459
$ ,690 2e
Palmyra-Pawnee - CWIP
3017
$ ,663,313
$ ,538,011
$ ,137,726
$ (400,285)
$ (5,159)
$ (405,444) 2f
Palmyra-Pawnee - Plant in Service
$ ,248,640
$ ,079,243
$ ,560,372
$ ,129
$ ,201
$ ,330 2g
Fargo-Galesburg-Oak Grove - CWIP
3022
$ ,968
$ ,162
$ ,499
$ (9,663)
$ (125)
$ (9,788) 2h
Fargo-Galesburg-Oak Grove - Plant
$ ,009
$ ,670
$ ,065
$ ,395 $
$ ,980 2i
Pawnee-Pana - CWIP
3169
$ ,041,175
$ ,740
$ ,312
$ (143,428)
$ (1,849)
$ (145,277) 2j
Pawnee-Pana - Plant in Service
$ ,459
$ ,525
$ ,991
$ ,466
$ ,251
$ ,717 3
Subtotal
$ ,631,262
$ ,755,044
$ ,899,162 4
Under/(Over) Recovery
$ ,118
$ ,856
$ ,974 5
Applicable Interest rate per month (expressed to four decimal places)
Interest Rate to be updated through July 2017
Amount excludes True-Up Adjustment, as reported in True-Up Year projected Attachment MM, page 2, column 15. 2
Rounded to whole dollars.

18. AIC 2016 MVP SPEND Ameren MVPs Ameren Name 2016 CAPEX MTEP #s
MTEP Description
Illinois Rivers
$53.03 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
Spoon River
$0.77 million
3022
Fargo-Galesburg-Oak Grove 345 kV Line

19. 2016 Significant transmission projects added to plant
Project Name
Total Cost
Illinois Rivers Connections (MVP)
$69.1
Fargo - Mapleridge
$53.5
Grand Tower - Makanda
$23.0
Brokaw - Gibson City
$15.0
Sidney - Eugene
$10.5
Macomb West Tap
$9.9
E Quincy - Hamilton
$8.4
N Decatur - Latham West
$8.3
Keemin Substation
$7.4
Mattoon W - Murdock
$6.9
CIP V5
$6.0
Jacksonville - Meredosia
$5.9
Canton S - Ipava S
$5.8
Mt. Zion Substation
$5.6
Madison Industrial - Madison State St
$5.1

20. Additional information
Additional questions can be sent to Ameren at:
MISO Web Links
Transmission Pricing - Attachments O, GG & MM Information
Ameren OASIS
MTEP 16
MTEP 17
Schedule 26 & 26-A Indicative Charges