Initial Statement of Beneficial Ownership (3)

POWER OF ATTORNEY





 WHEREAS, directors, certain officers, and beneficial 

owners of more than 10% 

of any equity security of AMEREN CORPORATION, a Missouri 

corporation (herein 

referred to as the "Company"), as well as certain directors 

and officers of 

Company subsidiaries, are required to file with the 

Securities and Exchange 

Commission and the New York Stock Exchange, under Section 16 

of the Securities 

Exchange Act of 1934, as now and hereafter amended, 

statements regarding ownership 

and change in ownership of equity securities of the Company 

the "Reporting 

Forms"); and



 WHEREAS, the undersigned holds a directorship, office 

or offices in the 

Company and/or Company subsidiaries and is required to file 

such Reporting Forms.

 

 NOW, THEREFORE, the undersigned hereby constitutes and 

appoints 

Gregory L. Nelson and/or G. L. Waters and/or 

Ronald S. Gieseke and/or Craig W. Stensland 

and/or any individual who hereafter holds the offices 

of Secretary or Assistant 

Secretary of the Company the true and lawful attorneys-in-fact 

of the undersigned, 

for and in the name, place and stead of the undersigned, 

to affix the name of the 

undersigned (including, without limitation, any electronic 

signature) to the 

Reporting Forms and any amendments thereto, together with 

any other documents, 

certificates or instruments necessary to facilitate the 

filing thereof, and, 

for the performance of the same acts, each with power to 

appoint in their 

place and stead and as their substitute, one or more 

attorneys-in-fact for the 

undersigned, with full power of revocation; hereby ratifying 

and confirming 

all that said attorneys-in-fact may do by virtue hereof. 

The undersigned 

acknowledges that the foregoing attorney-in-fact, in serving 

in such capacity 

at the request of the undersigned, are not assuming, nor is 

the Company 

assuming, any of the undersigned's responsibilities to comply 

with Section 16 

of the Securities Exchange Act of 1934.  The undersigned 

further acknowledges 

that in whatever capacities she may hold in the Company and/or 

its subsidiaries 

in the future, this Power of Attorney shall remain in full 

force and effect 

until such time it would be revoked by the undersigned.



 IN WITNESS WHEREOF, the undersigned has hereunto set her 

hand this 28th day of April, 2015.



                   /s/ Mary P. Heger 

                        Mary P. Heger

STATE OF MISSOURI  )

   ) SS.

CITY OF ST. LOUIS  )



 On this 28th day of April, 2015, before me, the 

undersigned Notary Public 

in and for said State, personally appeared Mary P. Heger, 

known to me to be the 

person described in and who executed the foregoing power 

of attorney and 

acknowledged to me that she executed the same as her free act 

and deed for the 

purposes therein stated.



 IN TESTIMONY WHEREOF, I have hereunto set my hand and 

affixed my official seal.



 

                  /s/ Carla J. Flinn                  

 

     Carla J. Flinn - Notary Public 

                     Notary Seal, State 

of 

                       Missouri - St. Louis 

City

      Commission #14399906

          My Commission Expires 

04/20/2018