Third Amendment to amended and restated Ameren Supplemental Retirement Plan, dated January 5, 2015

Amended and Restated Effective January 1, 2008

WHEREAS, Ameren Corporation ("Company") previously adopted the Ameren Supplemental Retirement Plan, as amended and restated effective January 1, 2008 (the "Plan"); and

WHEREAS, the Company reserved the right to amend the Plan; and

WHEREAS, the Company desires to amend the Plan to streamline the process for identifying eligible employees for participation in the Plan.

NOW, THEREFORE, effective January 1, 2015, Section 2.1 of the Plan is amended,

in its entirety, to read as follows:

2.1    Eligibility.

Any individual who was a Participant in the Plan on December 31, 2007 shall continue as a Participant in this Plan on January 1, 2008. On or after January 1, 2008, each Employee whose benefits under the Retirement Plan are limited (1) by operation of Code Section 415 or Code Section 401(a)(17) or (2) due to the exclusion of earnings deferred under the Ameren Deferred Compensation Plan, shall be a Participant in this Plan as of any January 1 following the date his or her Retirement Plan benefits are so limited or enhanced. Any such election as to the time and form of payment will be considered timely filed if made before such January 1 and in

accordance with procedures established by the Company or its designee.

IN WITNESS WHEREOF, this Amendment has been executed by a duly authorized individual this 5th day of January, 2015.

AMEREN CORPORATION

By: Mark C. Lindgren

Name: Mark C. Lindgren

Title:    Vice President and

Chief Human Resources Officer Ameren Services Company

On Behalf of Ameren Corporation

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