1. 2017 Annual Attachment O Stakeholder Meeting Ameren Missouri
July 11, 2017

2. Agenda
Primary purpose is to review AMMO Pricing Zone Historical 2016 Transmission Rate Calculations which became effective June 1, 2017
Protocol Timeline
ROE Complaint Cases
Comparison to Previous Revenue Requirement
2017 AMMO Pricing Zone NITS Charge

3. Protocol timeline Date Action (Historical) June 1
Posting of annual update
Information exchange period begins.
Review period begins.
September 1
Deadline for annual meeting
November 1
Deadline for joint meeting on regional cost-shared projects
December 1
Deadline for Interested Parties to submit information requests
January 10
Deadline for Transmission Owners to respond to information requests
January 31
Deadline for Interested Parties to submit Informal Challenges
February 28
Deadline for Transmission Owners to respond to Informal Challenges
Any rate changes agreed to by the Transmission Owner will be included in the Information Filing and will be reflected in the Annual Update for the following Rate Year.
March 15
Transmission Owners submit informational filing to the Commission.
March 31
Deadline for Interested Parties to file Formal Challenge at the Commission

4. Roe complaint 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 with a 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. Current effective ROE is 10.82%
Roe complaint
Current effective ROE is 10.82%
Effective revenue requirement will be adjusted as needed for new ROE upon receipt of Order in 2nd Complaint Case
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.
Point-to-point refunds made by Ameren Missouri are treated as an adjustment in the 2016 Annual Update
Phase 2 related to the ROE impact on true-ups calculations for forward looking TOs. These were settled in June 2017.
No Phase 2 schedule 9 refunds for Ameren Missouri since they are historical
Refunds for Schedules 7, 8, 26, 37, 38, 26A were completed by MISO
Refunds for Schedule 9 were completed by Ameren
Small point-to-point amounts related to Phase 2 of ROE will flow through the 2017 True-Up.
Schedule 9 Refund amounts and supporting documents are posted on OASIS

6. Ameren Missouri Revenue Requirement June 2016 vs June 2017 Calculation
For comparison purposes, both years based on 10.82% ROE
per the Order issued in Docket EL14-12

7. Ameren Missouri June 2017 Calculation
Rate Base
Page.Line
Jun-16
Jun-17
Change
Percent
2.6
Total Gross Plant
1,002,549,260
1,176,985,925
174,436,665
17%
2.12
Total Accum Depreciation
317,488,807
337,277,231
19,788,424 6%
2.18
TOTAL NET PLANT
685,060,453
839,708,694
154,648,241
23%
ADJUSTMENTS TO RATE BASE
2.20
Account No. 282
(193,381,672)
(241,157,155)
(47,775,483)
25%
2.21
Account No. 283
(6,947,952)
(6,231,888)
716,064
-10%
2.22
Account No. 190
4,830,788
6,048,866
1,218,078
2.25
Land Held for Future Use
3,334,568
4,741,655
1,407,087
42%
2.26
CWC
4,099,708
4,446,739
347,031 8%
2.27
Materials & Supplies
7,423,375
4,105,744
(3,317,631)
-45%
2.28
Prepayments
946,165
1,210,298
264,133
28%
TOTAL ADJUSTMENTS
(179,695,020)
(226,835,740)
(47,140,720)
26%
2.30
TOTAL RATE BASE
505,365,433
612,872,955
107,507,522
21%

8. Ameren Missouri June 2017 Calculation
Expenses
Page.Line
Jun-16
Jun-17
Change
Percent
O&M
3.1
Transmission
67,034,333
77,077,746
10,043,413
15%
3.1a
Less LSE Expenses
6,469,633
6,676,917
207,284 3%
3.2
Less Account 565
36,318,361
43,363,135
7,044,774
19%
3.3
A&G
8,060,504
7,899,056
(161,448)
-2%
3.4
Less FERC Annual Fees -
N/A
3.5
Less EPRI, ect.
651,660
634,804
(16,856)
-3%
3.5a
Plus Trans. Reg. Comm. Exp
41,882
32,280
(9,602)
-23%
3.7
Transmission Lease Payments
1,100,598
1,239,690
139,092
13%
3.8
TOTAL O&M
32,797,663
35,573,915
2,776,252 8%
3.12
TOTAL DEPRECIATION
24,671,586
26,760,281
2,088,695
TAXES
3.13
Payroll
596,060
607,758
11,698 2%
3.16
Property
9,375,098
10,222,922
847,824 9%
3.18
Other
77,189
9,987
(67,202)
-87%
3.27
Income Taxes
16,697,187
20,442,429
3,745,242
22%
TOTAL TAXES
26,745,534
31,283,096
4,537,562
17%
TOTAL EXPENSES
84,214,783
93,617,292
9,402,509
11%

9. Ameren Missouri June 2017 Calculation
Capital Structure
Capital Structure - June 2016
Page.Line $ %
Cost
Weighted
4.27
Long Term Debt
3,847,276,000
49%
0.0527
0.0256
4.28
Preferred Stock
80,759,500 1%
0.0424
0.0004
4.29
Common Stock
4,001,834,831
50%
0.1082
0.0546
4.3
Total
7,929,870,331
100%
0.0806
Capital Structure - June 2017
3,737,276,000
48%
0.0522
0.0249
4,009,795,947
51%
0.0554
7,827,831,447
0.0808
Change in Return
0.0160%

10. Ameren Missouri June 2017 Calculation
Revenue Requirement
Page.Line
Jun-16
Jun-17
Change
Percent
2.30
TOTAL RATE BASE
505,365,433
612,872,955
107,507,522
21%
4.30
Rate of Return
0.0806
0.0808
0.0002 0%
3.28
Return
40,741,013
49,506,223
8,765,211
22%
Total Expenses
84,214,783
93,617,292
9,402,509
11%
3.29
TOTAL GROSS REV. REQ.
124,955,795
143,123,515
18,167,721
15%
3.30
Less ATT. GG Adjustment
7,613,494
15,562,140
7,948,646
104%
3.30a
Less ATT. MM Adjustment -
N/A
3.31
GROSS REV. REQ. UNDER ATT. O
117,342,301
127,561,376
10,219,075 9%

11. Ameren Missouri June 2017 Calculation
Net Revenue Requirement
Page.Line
Jun-16
Jun-17
Change
Percent
1.1
Gross Revenue Requirement
117,342,301
127,561,376
10,219,075 9%
1.6
Total Revenue Credits
6,830,307
6,377,122
-453,185
-7%
1.6c
Total Prior Period Adjustment (with interest)
-1,571
605,636
607,207
-38651%
1.7
NET REVENUE REQUIREMENT
110,510,423
121,789,890
11,279,467
10%
The Prior Period Adjustments for June 2016 relate to the FERC Audit Refund in Docket No. FA
The Prior Period Adjustments for June 2017 relate to the point-to-point portion of the ROE refund required per the Order in Docket No. EL14-12

12. Ameren Missouri June 2017 Calculation
AMMO Schedule 9 Rate Calculation
Page.Line
Jun-16
Jun-17
Change
Percent
1.7
Net Revenue Requirement
110,510,423
121,789,890
11,279,467
10%
1.15
Ameren Missouri Divisor
6,518,000
6,317,790
(200,210)
-3%
Annual Cost ($/kW/Yr)
16.955
19.277
2.323
14%
Network & P-to-P Rate ($/kW/Mo)
1.413
1.606
0.194
The divisor excludes the Southeast Missouri load included in the Entergy Arkansas, Inc. (EAI) pricing zone.

13. Ameren Missouri June 2017 Calculation
Attachment GG 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 col 5 (Note A)
1,150,802,224 2
Net Transmission Plant - Total
Attach O, p 2, line 14 and 23b col 5 (Note B)
823,265,384
O&M EXPENSE 3
Total O&M Allocated to Transmission
Attach O, p 3, line 8 col 5
35,573,915 4
Annual Allocation Factor for O&M
(line 3 divided by line 1 col 3)
3.09%
GENERAL AND COMMON (G&C) DEPRECIATION EXPENSE 5
Total G&C Depreciation Expense
Attach O, p 3, lines 10 & 11, col 5 (Note H)
1,177,700 6
Annual Allocation Factor for G&C Depreciation Expense
(line 5 divided by line 1 col 3)
0.10%
TAXES OTHER THAN INCOME TAXES 7
Total Other Taxes
Attach O, p 3, line 20 col 5
10,840,667 8
Annual Allocation Factor for Other Taxes
(line 7 divided by line 1 col 3)
0.94% 9
Annual Allocation Factor for Expense
Sum of line 4, 6, and 8
4.14%
INCOME TAXES 10
Total Income Taxes
Attach O, p 3, line 27 col 5
20,442,429 11
Annual Allocation Factor for Income Taxes
(line 10 divided by line 2 col 3)
2.48%
RETURN 12
Return on Rate Base
Attach O, p 3, line 28 col 5
49,506,223 13
Annual Allocation Factor for Return on Rate Base
(line 12 divided by line 2 col 3)
6.01% 14
Annual Allocation Factor for Return
Sum of line 11 and 13
8.50%

14. Ameren Missouri June 2017 Calculation
Attachment GG Calculation - Page 2
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
Line No.
Project Name
MTEP Project Number
Project Gross Plant
Annual Allocation Factor for Expense
Annual Expense Charge
Project Net Plant
Annual Allocation Factor for Return
Annual Return Charge
Project Depreciation Expense
Annual Revenue Requirement
True-Up Adjustment
Network Upgrade Charge
(Note C)
(Page 1 line 9)
(Col. 3 * Col. 4)
(Note D)
(Page 1 line 14)
(Col. 6 * Col. 7)
(Note E)
(Sum Col. 5, 8 & 9)
(Note F)
Sum Col. 10 & 11 (Note G) 1a
Big River-Rockwood 138 kV
152
$ ,595,054
4.14%
$644,945
$ ,895,994
8.50%
$1,180,672
$331,163
$2,156,780 $0 1b
Reconductor Sioux-Huster-1 and kV
1240
$ ,620,832
$646,011
$ ,425,767
$1,140,719
$404,149
$2,190,879 1c
Gray Summit : 2nd 345/138 kV Transformer
2061
$ ,410,810
$926,816
$ ,844,108
$1,686,052
$407,469
$3,020,337 1d
Lutesville: Northwest Cape 345/161 kV substation and new lines
2306
$ ,585,316
$2,422,839
$ ,718,016
$4,904,005
$867,300
$8,194,144 2
Annual Totals
$15,562,140 3
Rev. Req. Adj For Attachment O

15. Significant transmission projects in 2016 and 2017
Completed in 2016
Project Name
Total Cost
Lutesville: Northwest Cape 345/161 kV substation and new lines
$61 Million
Viaduct-Cape Clark
$24 Million
Clark-Osage
$41 Million
To Be Completed in 2017
Project Name
Total Cost
Intelligrid
$22 Million
Sioux-Viele
$7 Million
Page-Mason
CIP V5
$5 Million

16. 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