Demark is a professional consulting and engineering firm that provides technical and support services for all aspects of the Power (Fossil, Wind, Solar, Nuclear) and Petro Chemical Industry.

Founded on the premise of providing the highest quality services to our clients, our dedicated team of project experts continues to provide services that exceed our customer’s expectations.

Demark takes great pride in providing quality people with a high percentage having served the power industry for decades.

With this practical experience, they bring in-depth technical expertise, proven solutions and lessons learned to the wide range of issues found on the projects we serve today.

Much is required for any major project to be successful. All project elements must be technically correct and meticulously coordinated with all entities involved. This requires project team members experienced in a wide range of disciplines. Demark has the expertise needed to achieve the highest level of project success.

Our Mission at Demark, Inc.

Experienced People Serving Our Clients

We Serve All Areas Of Power Generation

Let Demark Make The Difference In Your Next Project!


1150 Essington Rd.
Joliet, IL 60435

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