Ameren Headquarters & Corporate Office

About Ameren

Ameren Corporation is an American energy company headquartered in St. Louis, Missouri. The company was formed in 1997 through the merger of Union Electric Company and CIPSCO Incorporated, bringing together established electric and natural gas utility operations serving customers in Missouri and Illinois. Since its formation, Ameren has developed into a major regional energy provider, investing in electricity generation, transmission, distribution infrastructure, natural gas services, and improvements to the reliability of its utility networks.

Today, Ameren Corporation operates as the parent company of several utility businesses, including Ameren Missouri, Ameren Illinois, and Ameren Transmission Company of Illinois. Its services support residential households, commercial businesses, industrial customers, and communities across its service territory. The company focuses on delivering electricity and natural gas, maintaining power lines and pipelines, responding to outages, modernizing energy infrastructure, and providing billing, payment, energy-efficiency, and customer-account services. Ameren serves millions of electric customers and hundreds of thousands of natural gas customers across Missouri and Illinois.

Ameren Corporation remains a publicly traded utility holding company listed on the New York Stock Exchange under the ticker symbol AEE. It is not a subsidiary of another utility company. Its operating businesses continue to serve different parts of the region under the Ameren Missouri and Ameren Illinois names. The company’s corporate headquarters remains at 1901 Chouteau Avenue in St. Louis, Missouri. Ameren’s current business priorities include grid reliability, infrastructure investment, energy efficiency, and the continued development of a more resilient energy system.

Ameren Headquarters & Corporate Office Address

Current Headquarters

Ameren Corporation
1901 Chouteau Avenue
St. Louis, MO 63103, United States

This is the company’s principal executive office and corporate headquarters address, as identified in its corporate filings and official corporate fact sheet.

Corporate Office

Ameren Corporation
One Ameren Plaza
1901 Chouteau Avenue
St. Louis, MO 63103, United States

One Ameren Plaza is the corporate location associated with Ameren’s main St. Louis office. Customers seeking help with an electricity or natural gas account should normally contact the relevant operating utility rather than assume that the corporate office handles everyday billing and service requests.

Mailing Address

Ameren Illinois
P.O. Box 88034
Chicago, IL 60680-1034, United States

Ameren Missouri
P.O. Box 790098
St. Louis, MO 63179-0098, United States

These are published mailing addresses for general correspondence with the respective operating utilities. Payment instructions can differ by utility and type of payment, so customers should confirm the correct destination on their current bill or official account portal before mailing a payment.

Other Important Address

Ameren Investor Relations
1901 Chouteau Avenue
St. Louis, MO 63103, United States

Investors and shareholders should use Ameren’s official investor relations website for shareholder services, stock information, financial reports, and investor inquiries. Individual shareholder account services are handled through the company’s designated shareholder services provider.

Quick Information

Corporate Phone Number

(314) 621-3222.
This is the main corporate telephone number listed in Ameren Corporation’s SEC filings.

Customer Service Number

Ameren Illinois residential customers: 1-800-755-5000. Ameren Missouri residential customers: 1-800-552-7583. Customers should select the number for the utility that appears on their bill.

Corporate Office Address

1901 Chouteau Avenue, St. Louis, MO 63103, United States.

Headquarters Address

1901 Chouteau Avenue, St. Louis, MO 63103, United States.

Email

Investor Relations: InvestorRelations@ameren.com. For customer service, customers should use the relevant utility’s official contact page because contact options and email channels can vary by issue.

Industry

Electric utilities, natural gas distribution, energy infrastructure, power transmission, and utility services.

Founded

Ameren was formed through a merger involving Union Electric Company and CIPSCO Incorporated.

Number of Employees

Approximately 9,000 employees, according to Ameren’s corporate fact sheet. Employee totals may change as the company hires staff and updates its reporting.

Number of Customers

Ameren’s corporate fact sheet reports approximately 2.5 million electric customers and more than 900,000 natural gas customers across its service territory. These figures describe utility customers, not retail stores.

Corporate Office Hours

Ameren does not publish a single universal customer-facing schedule for every corporate function. Customer service hours depend on the operating utility and department. Residential customer service is generally listed as Monday through Friday, 7:00 a.m. to 7:00 p.m.; confirm current hours on the official contact page before calling.

Website

https://www.ameren.com/

Investor Relations / Careers Page

Investor Relations: https://www.amereninvestors.com/

Careers: https://www.ameren.com/careers

Ameren Products & Services

Electricity Supply and Distribution

Ameren’s operating utilities provide electricity to residential, commercial, and industrial customers in Missouri and Illinois. Their work includes delivering power through distribution networks, maintaining equipment, and supporting dependable electric service.

Natural Gas Services

Ameren Missouri provides natural gas service to eligible customers in its service territory. Services include gas distribution, account management, billing, payment arrangements, and safety-related customer assistance.

Power Outage Reporting and Restoration

Customers can report outages, check restoration information, and review outage maps through Ameren’s online outage resources. For downed power lines, suspected gas leaks, or other immediate hazards, customers should contact the appropriate emergency utility number and stay away from the danger.

Residential Utility Accounts

Residential customers can manage utility accounts, review bills, make payments, update account details, and explore available payment options. Online account tools help customers access routine services without visiting a corporate office.

Commercial and Industrial Utility Services

Ameren provides utility services to businesses and larger energy users. Dedicated commercial support can assist with billing questions, account administration, service requirements, and certain construction or engineering requests.

Billing and Payment Services

Customers can access online payment options and authorized telephone payment services. Payment methods and processing instructions may differ between Ameren Illinois and Ameren Missouri, so customers should follow the instructions associated with their own account.

Energy Efficiency Programs

Ameren offers energy-efficiency resources and programs intended to help eligible customers reduce energy consumption and better understand their usage. Program eligibility, incentives, and application requirements vary by location and program.

Construction and Engineering Services

Ameren provides dedicated construction and engineering contact channels for qualifying utility-related projects. These services can include coordination involving electrical infrastructure, service extensions, and construction requirements.

Transmission Infrastructure

Ameren Transmission Company of Illinois develops and manages regional electric transmission projects. These projects support the movement of electricity across the wider grid and help maintain the infrastructure needed for regional power delivery.

Customer Assistance and Payment Support

Customers who have difficulty paying a bill can contact their operating utility to ask about payment arrangements and available assistance programs. Eligibility and required documentation depend on the program and the customer’s circumstances.

Ameren Corporate Phone Numbers

Corporate Phone Number

(314) 621-3222.
This number is listed as Ameren Corporation’s main corporate telephone number in its SEC filings.

Corporate Headquarters Number

(314) 621-3222.
Use this number for general corporate inquiries; utility account issues are usually handled more efficiently by the relevant operating company.

Headquarters Number

(314) 621-3222.
This is the publicly listed corporate telephone number associated with the St. Louis headquarters.

Corporate Office Number

(314) 621-3222.
Ask the operator to direct your call to the appropriate corporate department if your issue is not related to a utility account.

Customer Service Number

Ameren Illinois residential: 1-800-755-5000. Ameren Missouri residential: 1-800-552-7583.

Customer Support Number

For standard residential utility support, use the customer service number for Ameren Illinois or Ameren Missouri shown above. A separate universal customer support number for all Ameren businesses is not identified here.

Toll-Free Number

Ameren Illinois residential: 1-800-755-5000. Ameren Missouri residential: 1-800-552-7583. These numbers are intended for the respective operating utility’s residential customers.

Sales Number

Ameren Illinois commercial: 1-800-232-2477. Ameren Missouri commercial: 1-877-426-3736. These numbers are listed for commercial customer service rather than general residential sales.

Billing Number

Customers should contact the residential or commercial customer service number for their specific operating utility. For residential customers, use 1-800-755-5000 in Illinois or 1-800-552-7583 in Missouri.

Regional Office Number

Ameren Illinois residential support: 1-800-755-5000. Ameren Missouri residential support: 1-800-552-7583. These are regional utility service contacts, not separate corporate regional headquarters numbers.

Branch Office Number

Ameren does not publish a single public branch-office telephone number for every operating location. Customers should use the official contact information for their service territory and department.

International Number

A dedicated general international customer service number was not verified. Customers outside the United States should use the official Ameren contact website to identify the correct department and available contact method.

Emergency / After-Hours Number

Ameren Illinois: 1-800-755-5000. Ameren Missouri: 1-800-552-7583. These numbers are published for urgent utility issues such as downed power lines or suspected gas hazards. If there is immediate danger, move away from the hazard and contact emergency services as appropriate.

Investor Relations Number

Ameren Corporation’s main corporate telephone number is (314) 621-3222. For shareholder account questions, EQ Shareowner Services can be reached at 1-800-255-2237. Institutional investors and analysts can use InvestorRelations@ameren.com.

Media / Press Number

Ameren corporate financial, environmental, and other corporate media inquiries: 314-554-2182.

Human Resources Number

A separate general public human resources telephone number was not verified. Employment candidates should use the official careers website for current job listings and recruitment-related guidance.

Website Support Number

Ameren website support: 1-877-263-7361. Published support hours vary by operating utility and website function.

Construction and Engineering Number

Ameren Illinois construction: 1-888-659-4540. Ameren Missouri construction: 1-866-992-6619. These numbers are for construction and engineering-related inquiries.

How to Reach a Real Person at Ameren

For a question about an electricity or natural gas account, begin with the customer service number printed on your current bill. Residential customers in Illinois can call 1-800-755-5000, while residential customers in Missouri can call 1-800-552-7583. Follow the telephone prompts for billing, payments, starting or stopping service, account changes, or outage-related support. If the issue concerns a business account, use the relevant commercial contact number instead.

Before calling, prepare the account holder’s name, service address, account number, a recent bill, and a short explanation of the problem. If you are disputing a charge, keep the billing period, amount in question, payment confirmation, and any earlier case or reference number available. Ask the representative to explain the next steps and provide a case number if the issue requires follow-up.

The corporate office at 1901 Chouteau Avenue in St. Louis is best suited to corporate or administrative inquiries, not ordinary meter, billing, or outage issues. For an unresolved utility complaint, first request a supervisor through customer service and keep a record of the date, time, and outcome of each contact. If the dispute remains unresolved, consider filing with the relevant state utility regulator, depending on whether the service is provided in Missouri or Illinois.

How to File a Complaint Against Ameren

Complaints may concern billing errors, disputed charges, service interruptions, payment arrangements, customer service, safety concerns, or utility service quality. Keep copies of bills, payment confirmations, meter readings if relevant, photographs, prior correspondence, and any case numbers before escalating the matter.

Step 1: Contact Customer Service

Contact Ameren Illinois at 1-800-755-5000 or Ameren Missouri at 1-800-552-7583, depending on the utility that provides your service. Explain the problem clearly and provide the service address and account information requested by the representative. Ask for a complaint or reference number and confirm what action the company will take.

Step 2: Contact the Relevant Department

If the issue relates to billing, payment processing, outages, construction, or a business account, request the department responsible for that service. Explain what has already happened and provide supporting documents, such as a disputed bill or payment receipt. Using the correct department can reduce delays and prevent repeated transfers between teams.

Step 3: Request Supervisor or Management Review

If the first representative cannot resolve the issue, ask for a supervisor or a formal review. Explain the resolution you are requesting, such as a corrected bill, investigation of a service problem, or review of a payment arrangement. Record the supervisor’s name or identification details if provided, the date of the discussion, and any promised follow-up.

Step 4: Use the Company’s Written Complaint Channel

Submit your complaint through Ameren’s official customer contact or account portal, or use the written correspondence address appropriate to your operating utility. Include your account number, service address, a concise timeline, copies of relevant bills, and details of previous calls. Keep the submission confirmation and a complete copy of everything sent.

Step 5: Contact Corporate Headquarters

If your complaint remains unresolved through normal customer service channels, you can contact Ameren Corporation at 1901 Chouteau Avenue, St. Louis, MO 63103, or call (314) 621-3222 to ask where a corporate concern should be directed. Include previous case numbers and explain why the operating utility’s response has not addressed the problem. Corporate headquarters should generally be treated as an escalation route, not a replacement for the utility’s dedicated service channels.

Step 6: Use the Specialized Complaint or Dispute Department

For issues involving payment assistance, construction, website access, or other specialized services, ask Ameren to route the matter to the relevant department. If the complaint involves an urgent safety hazard, do not wait for a written complaint response; use the published emergency utility contact and follow safety instructions. Keep any department-specific reference number with your records.

Step 7: File With the Appropriate Regulator

For a regulated utility complaint, consider contacting the Missouri Public Service Commission if your service is provided by Ameren Missouri, or the Illinois Commerce Commission for a matter involving Ameren Illinois. These agencies handle certain utility complaints within their jurisdictions. Provide the regulator with your account details, the nature of the dispute, copies of supporting documents, and evidence that you attempted to resolve the matter with the company.

Step 8: Use Consumer Protection or Financial Dispute Options

If the issue involves misleading business practices, a payment dispute, or another consumer protection concern, consider contacting the appropriate state consumer protection office. Choose an agency whose jurisdiction matches the complaint and understand that it may not have authority to decide every utility billing or rate dispute. For regulated utility matters, the relevant utility commission is usually the more direct escalation route.

Step 9: Consider Formal Legal or Arbitration Procedures

If a serious dispute remains unresolved, consider seeking advice from a qualified attorney or an appropriate legal aid organization. Review the applicable utility rules, service terms, and any formal dispute procedures before filing a legal claim. Keep all bills, correspondence, regulator submissions, and case outcomes organized, and do not miss any filing deadlines that may apply.