Confidential - Submitted Pursuant to 16 USC 825 and 42 USC 16452 Do Not Release Pursuant to FOIA. Ameren Illinois Company and Ameren Transmission Company of Illinois Response to ICC Staff Data Requests Docket No. Response Date: 09/23/2014 ICC 1.1 What is the basis of assigning Administrative and General Expenses to ATXI? Why is there such a large variation between the projection and the actual A&G expenses for ATXI? RESPONSE: The projected 2013 revenue requirement calculation was performed in August 2012 based in part on information in Ameren’s corporate forecast model as well as year-to-date information. At that time, ATXI was still a very new entity and the corporate forecast model had not been updated to include all appropriate corporate allocation factors. Therefore, we expected that the A&G used in the projected 2013 would be lower than what we would actually experience for actual 2013 results. However, our preference was to accept a lower amount in the projected rate calculations based on known 2012 results. However, here are some more specific details behind the A&G increases from 2012 to 2013. In general, most A&G costs in 2013 were directly assigned to ATXI. Account 920 A&G Salaries - All transmission employees are Ameren Service employees. Certain leadership employees charge time to A&G account 920 when working on ATXI non-capital issues. In 2013, these costs would have been directly assigned to account 920. As shown in the 2013 FERC Form 1, Account 920 increased from $199k in 2012 to $511k in 2013. Account 921 increased from $705k in 2012 to $2,264k in 2013. Almost the entire amount for both years is related to credit facility fees for short-term borrowing utilized by Ameren Corp. These borrowing facilities provide a source of credit for Ameren Corp to provide short term financing for ATXI construction activities. Account 923 - charges for outside services increased from $105k in 2012 to $328k in 2013. These costs would have been directly assigned. Account 931 – rents increased from $100k, in 2012 to $263k in 2013 due to building space rental, which is allocated from the service company based on a corporate indirect allocation that is based on the results of all direct and direct allocated allocations. Since 2013True Up Response to ICC Page 1 of 3 the growth of ATXI resulted in more direct and direct allocated expense from the service company in 2013, ATXI also received a larger share of rent expense through the corporate indirect allocation. 2013True Up Response to ICC Page 2 of 3 ICC 1.2 Are any of the O&M costs assigned to AIC and/or ATXI related to participation in the stakeholder processes of RTOs other than MISO? If so, are any of those costs associated with participation in PJM’s Transmission Expansion Advisory Committee? RESPONSE: Ameren has been participating in the PJM and SPP stakeholder process on a limited basis for many years. Ameren has multiple direct interconnections with both RTOs and must follow the planning activities of each to keep abreast of cross-border projects and proposals that would impact the MISO and Ameren systems. Participation also helps Ameren understand how our customer may be impacted by other RTO actions and provides Ameren opportunities to advocate on customers behalf. Costs incurred in 2013 by Ameren for the general purpose of following other RTO activities would be allocated across the Ameren transmission-owning companies. 2013True Up Response to ICC Page 3 of 3