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Ameren Mechanical Engineer - Intern/Co-op in St. Louis, Missouri

If end date is listed, the posting will come down at 12:00 am on that date:

Ameren Corporation is a Fortune 500 company that trades on the New York Stock Exchange under the symbol AEE. It is the parent company of Ameren Illinois, based in Collinsville, Ill., and Ameren Missouri in St. Louis. Ameren Transmission Company, also based in St. Louis, designs and builds regional transmission projects.

Employing more than 9,000 personnel, Ameren powers the quality of life for 2.4 million electric customers and more than 900,000 natural gas customers across a 64,000-square-mile area. Ameren Missouri ranks as the largest electric power provider in Missouri, and Ameren Illinois ranks as Illinois' third largest natural gas distribution operation in total number of customers. 

The purpose of Ameren's collegiate program is to pipeline interns and co-ops to our entry-level full-time employment openings. Our intern and co-op opportunities provide hands-on working experience, professional development, networking, and mentoring.

This general posting will be used to collect applications for our  *2022 Mechanical Engineer Intern and Co-op * openings across the states of Missouri and Illinois.

The options for collegiate employment are full-time opportunities during the following time periods:

           January – August Co-op

           May – August Internship

           May – December Co-op

Please note Ameren’s collegiate program is heavily focused on co-op opportunities to allow us to provide students with more challenging projects and experiences to prepare them for future employment opportunities. 


Must be a current student pursuing a Bachelors or Masters in Mechanical Engineering from an accredited college or university required. A cumulative GPA of 2.5 or above is required.

We will provide more information about each opportunity at time of interview.

Please continue to check for additional opportunities to be posted.


Ameren is located throughout Missouri and Illinois. Due to our current environment and focus on safety, it is possible internships and co-ops will work virtually for 2021. There may be some opportunity for office work or in the field, if our intern/co-ops can safely do so.

Location decisions will be made as soon as possible during the hiring process. If you are selected for an intern or co-op position, please note that Ameren does offer a housing stipend to interns and co-ops who are temporarily relocating, if minimum housing stipend requirements (living & attending school 50+ miles away from your working location) are met.

Growth Potential

Ameren responds to our changing industry by providing new solutions for tomorrow's energy needs. All collegiate coworkers directly impact Ameren's mission to Power the Quality of Life.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, ethnicity, age, disability, genetic information, military service or status, pregnancy, marital status, sexual orientation, gender identity or expression, or any other class, trait, or status protected by law.

St. Louis-based Ameren Corporation powers the quality of life for 2.4 million electric customers and more than 900,000 natural gas customers in a 64,000-square-mile area through its Ameren Missouri and Ameren Illinois rate-regulated utility subsidiaries. Ameren Illinois provides electric transmission and distribution service and natural gas distribution service. Ameren Missouri provides electric generation, transmission and distribution service, as well as natural gas distribution service. Ameren Transmission Company of Illinois develops, owns and operates rate-regulated regional electric transmission projects. For more information, visit, or follow us on Twitter at @AmerenCorp,, or LinkedIn/company/Ameren.