Ameren (AEE) S-3ASR Automatic shelf registration

Exhibit 23.6

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of our reports dated February 28, 2012 relating to the financial statements and financial statement schedule, which appear in Ameren Illinois Company’s Annual Report on Form 10-K for the year ended December 31, 2011. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

St. Louis, Missouri

June 21, 2012