AMEREN CORPORATION
Audit and Risk Committee Charter

Purpose

The Audit and Risk Committee of the Board of Directors assists the Board in fulfilling its responsibility for oversight of the quality and integrity of the accounting, auditing and reporting practices of the Company and such other duties as directed by the Company’s Board. The Audit and Risk Committee is expected to maintain free and open communication with the independent accountants and the management of the Company. In discharging this oversight role, the Audit and Risk Committee is empowered to investigate any matter brought to its attention, with full power to retain external auditors, outside counsel or other experts for this purpose. The Company shall at all times make adequate provisions for the payment of all fees and other compensation approved by the Audit and Risk Committee to the independent accountants in connection with the issuance of their audit report or to any consultants, counsel or experts employed by the Audit and Risk Committee. The Audit Committee shall perform its committee functions for all Ameren Corporation subsidiaries which are registered companies pursuant to the Securities Exchange Act of 1934.

Audit and Risk Committee Composition and Meetings

The Audit and Risk Committee shall be comprised of three or more directors as determined by the Board, each of whom shall satisfy the independence requirements of the New York Stock Exchange (“NYSE”) and Section 10A of the Securities Exchange Act of 1934, as amended by the Sarbanes-Oxley Act of 2002, and the rules promulgated thereunder. The members of the Audit and Risk Committee will meet the applicable requirements of the Securities and Exchange Commission (“SEC”) and the NYSE. At least one member of the Audit and Risk Committee shall (a) qualify as a “financial expert” within the meaning of the rules of the SEC and (b) have “accounting or related financial management expertise” within the meaning of the rules of the NYSE. Audit and Risk Committee members shall not simultaneously serve on the audit committees of more than two additional audit committees of other public companies, unless the Board determines that service by any member of the Audit and Risk Committee on more than two additional audit committees of other public companies (other than controlled companies of Ameren Corporation) would not impair the ability of such member to effectively serve on Ameren’s Audit and Risk Committee. Directors’ fees (including fees for attendance at meetings of committees of the Board) are the only compensation that an Audit and Risk Committee member may receive from the Company.

The Board shall appoint the Chair and the other members of the Audit and Risk Committee annually, considering the recommendation of the Nominating and Corporate Governance Committee. If an Audit and Risk Committee Chair is not designated or present, the members of the Audit and Risk Committee may designate a Chair by majority vote of the Audit and Risk Committee membership.

The Chair shall be responsible for leadership of the Audit and Risk Committee, including overseeing the agenda, presiding over the meetings and reporting to the Board. The Audit and Risk Committee shall meet at least six times each year (or more frequently if circumstances require) and hold such other meetings from time to time as may be called by its Chair, the Chief Executive Officer or any two members of the Committee. Meetings may also be held telephonically or actions may be taken by unanimous written consent. A majority of the members of the Audit and Risk Committee shall constitute a quorum of the Committee. The vote of a majority of the members of the full Audit and Risk Committee shall be the act of the Committee. Except as expressly provided in this Charter or the By-Laws of the Company or as required by law, regulations or NYSE listing standards, the Audit and Risk Committee shall fix its own rules of procedure.

Audit and Risk Committee Authority, Duties and Responsibilities

1. The Audit and Risk Committee is directly responsible for the appointment, pre-approval of compensation and oversight of the work of the independent accountants employed by the Company (including resolution of disagreements between management and the accountants regarding financial reporting) for the purpose of preparing or issuing an audit report or related work. The independent accountants shall report directly to the Audit and Risk Committee.

2. The Audit and Risk Committee shall have the sole authority to appoint or replace the independent accountants that audit the financial statements of the Company. The Audit and Risk Committee shall have the ultimate authority and responsibility to evaluate the performance of the independent accountants and, where appropriate, replace the independent accountants. In the process, the Audit and Risk Committee will discuss and consider the accountants’ written affirmation that the accountants are in fact independent, will discuss the nature and rigor of the audit process, receive and review all reports and will provide to the independent accountants full access to the Audit and Risk Committee (and the Board) to report on any and all appropriate matters.

3. The Audit and Risk Committee shall ensure that the independent accountants submit on at least a quarterly basis to the Audit and Risk Committee a statement delineating all relationships between the independent accountants and the Company and actively engage in a dialogue with the independent accountants with respect to any disclosed relationships or services that may impact the accountants’ objectivity and independence; and, if deemed appropriate by the Audit and Risk Committee, recommend that the Board of Directors take appropriate action to ensure the independence of the accountants.

4. The Audit and Risk Committee shall review with the independent accountants and with the internal auditors the proposed scope of the annual audit (including planning, staffing, budget, locations and reliance upon management), past audit experience, the Company’s internal audit program, recently completed internal audits and other matters bearing upon the scope of the audit. The Audit and Risk Committee shall pre-approve all audit and audit-related engagement fees and terms and other significant compensation to be paid to the independent accountants as well as pre-approve all non-audit engagements with the independent accountants. The Audit and Risk Committee shall consult with management but shall not delegate these responsibilities, except that pre-approvals of non-audit services may be delegated to a single member of the Audit and Risk Committee.

5. The Audit and Risk Committee shall review and discuss with management and the independent accountants the annual audited financial statements to be included in the Company’s Form 10-K filing, including (a) the Company’s disclosures under “Management’s Discussion and Analysis of Financial Condition and Results of Operations”, (b) matters regarding accounting and auditing principles as well as internal controls that could have a significant effect on the Company’s financial statements and (c) any other matters required to be discussed by the Statement on Auditing Standards No. 61, as modified or supplemented, relating to the conduct of the audit, prior to the filing of the Company’s Form 10-K. The Audit and Risk Committee shall also recommend to the Board that the Company’s annual financial statements, together with the report of their independent accountants as to their examination, be included in the Company’s Form 10-K.

6. The Audit and Risk Committee shall review and discuss with management and the independent accountants the Company’s quarterly financial statements, including the Company’s disclosures under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the matters required to be discussed pursuant to Statement on Auditing Standards No. 114, as modified or supplemented, prior to the filing of the Company’s Form 10-Q, including the results of the independent accountants’ reviews of the quarterly financial statements to the extent applicable.

7. The Audit and Risk Committee shall review and discuss with management and the independent accountants, as applicable, (a) major issues regarding accounting principles and financial statement presentations, including any significant changes in the Company’s selection or application of accounting principles, and reports from management and the independent accountants as to the Company’s internal controls over financial reporting and any special audit steps adopted in light of material control deficiencies; (b) analyses prepared by management or the independent accountants setting forth significant financial reporting issues and judgments made in connection with the preparation of the financial statements, including analyses of the effects of alternative GAAP methods on the financial statements; (c) any management letter provided by the independent accountants and the management’s response to that letter; (d) any problems, difficulties or differences encountered in the course of the audit work, including any disagreements with management or restrictions on the scope of the independent accountants’ activities or on access to requested information and management’s response thereto; (e) the effect of regulatory and accounting initiatives, as well as off-balance sheet structures, derivatives and liquidity exposures, on the financial statements of the Company; (f) earnings press releases (paying particular attention to any use of “pro forma,” or “adjusted” non-GAAP, information); (g) financial information and earnings guidance, if any, that are given to analysts and rating agencies, provided that such review and discussion may address the general types of information disclosed and types of presentations made and need not take place in advance of each instance in which the Company may provide such information or earnings guidance; and (h) suggestions or recommendations of the independent accountants or the internal auditors regarding any of the foregoing items.

8. The Audit and Risk Committee shall obtain and review a report from the independent accountants at least annually regarding (a) the independent accountants’ internal quality-control procedures, (b) any material issues raised by the most recent quality-control review, or peer review, of the firm, or by any inquiry or investigation by governmental or professional authorities within the preceding five years respecting one or more independent audits carried out by the firm, (c) any steps taken to deal with any such issues, and (d) all relationships between the independent accountants and the Company. The Audit and Risk Committee shall evaluate the qualifications, performance and independence of the independent accountants, including a review and evaluation of the lead partner of the independent accountant and taking into account the opinions of management and the Company’s internal auditors.

9. The Audit and Risk Committee shall ensure that the lead audit partner of the independent accountants and the concurring audit partner responsible for reviewing the audit are rotated at least every five years as required by the Sarbanes-Oxley Act of 2002, and further consider rotation of the independent accountant firm itself.

10. The Audit and Risk Committee shall recommend to the Board policies for the Company’s hiring of employees or former employees of the independent accountants who were engaged on the Company’s account (recognizing that the Sarbanes-Oxley Act of 2002 does not permit the CEO, CFO, controller or chief accounting officer to have participated in the Company’s audit as an employee of the independent accountants during the preceding one-year period).

11. The Audit and Risk Committee shall discuss with the independent accountants any communications between the audit team and the audit firm’s national office respecting auditing or accounting issues presented by the engagement.

12. The Audit and Risk Committee shall obtain and review disclosures made by the Company’s principal executive officer and principal financial officer regarding compliance with their certification obligations as required under the Sarbanes-Oxley Act of 2002 and the rules promulgated thereunder, including the Company’s disclosure controls and procedures and internal controls for financial reporting and evaluations thereof.

13. The Audit and Risk Committee shall review and approve the annual Internal Audit Plan, annual staffing plan, and financial budget.

14. The Audit and Risk Committee shall meet on a regular basis with a representative or representatives of the internal auditors of the Company (Internal Audit) and review the updates to the Audit Plan, significant staffing or budgetary changes, or other matters presented by Internal Audit.

15. The Audit and Risk Committee shall review the independent accountants’ assessment of the Company’s internal controls and internal audit function.

16. The Audit and Risk Committee shall (a) review the appointment, replacement, reassignment or dismissal of the leader of Internal Audit or approve the retention of, and engagement terms for, any third party provider of internal audit services, (b) review the performance of the Company’s internal audit function and (c) ensure that the Company maintains an internal audit function.

17. The Audit and Risk Committee shall maintain and review annually procedures for (a) the receipt, retention and treatment of complaints received by the Company regarding accounting, internal accounting controls or auditing matters and (b) the confidential, anonymous submission by employees of the Company of concerns regarding questionable accounting or auditing matters.

18. The Audit and Risk Committee shall meet on a regular basis with members of management to review business risk management processes, which include the identification, assessment, mitigation and monitoring of risks on a Company-wide basis.

19. The Audit and Risk Committee shall coordinate its oversight of business risk management processes with other committees of the Board of Directors having primary oversight responsibility for specific risks (e.g., Nuclear Oversight Committee) and annually review for the Board of Directors which committees maintain such oversight responsibilities and the overall effectiveness of business risk management processes.

20. The Audit and Risk Committee shall review policies and procedures related to officers’ expense accounts and perquisites, including use of corporate assets.

21. The Audit and Risk Committee shall review legal and regulatory matters that may have a material effect on financial statements, related Company compliance policies, and reports to regulators.

22. The Audit and Risk Committee shall meet separately in private executive sessions with internal auditors, independent accountants and management at least quarterly.

23. The Audit and Risk Committee shall regularly report its significant activities and actions to the Board of Directors.

24. The Audit and Risk Committee shall prepare a report for inclusion in the Company’s annual proxy and information statements as required by rules of the SEC and submit it to the Board for approval.

25. The Audit and Risk Committee shall annually review the performance of the Audit and Risk Committee.

26. The Audit and Risk Committee shall review and reassess the adequacy of this Charter on an annual basis and submit any recommended changes to the Board for approval.

27. The Audit and Risk Committee shall review any reports of the independent accountants mandated by Section 10A of the Securities Exchange Act of 1934, as amended, and obtain from the independent accountants any information with respect to illegal acts in accordance with Section 10A.

While the Audit and Risk Committee has the authority, duties and responsibilities set forth in this Charter, the Audit and Risk Committee’s function is one of oversight. The Company’s management is responsible for preparing the Company’s financial statements and, along with the internal auditors, for developing and maintaining systems of internal accounting and financial controls, while the independent accountants will assist the Audit and Risk Committee and the Board in fulfilling their responsibilities for their review of these financial statements and internal controls. The Audit and Risk Committee expects the independent accountants to call to their attention any accounting, auditing, internal accounting control, regulatory or other related matters that they believe warrant consideration or action. The Audit and Risk Committee recognizes that the financial management and the internal and outside accountants have more knowledge and information about the Company than do Audit and Risk Committee members. Further, the Company’s management is responsible for business risk management processes including the identification, assessment, mitigation and monitoring of risks on a Company-wide basis. Consequently, in carrying out its oversight responsibilities, the Audit and Risk Committee does not provide any expert or special assurance as to the Company’s financial statements, business risk management processes, or internal controls or any professional certification as to the independent accountants’ work.

December 14, 2007