Demark is a professional consulting and engineering firm that provides expertise and support services to major projects in the power industry. Our company was founded on the premise of providing the highest quality services to our customers.

Initially, we specialized primarily in support services for utilities, suppliers, and engineering and construction firms involved in Steam Generator Replacement Projects (SGRP). Demark's experience and services included all aspects of a SGRP, from initial planning to project closeout.

Since our extensive work on many SGRPs, we have also provided the same high quality services to other major projects in the power industry. These projects include:

  • Power Uprate Projects
  • Replacement of Reactor Vessel Heads
  • ISFSI (Dry fuel storage)
  • Plant Life Extension
  • Security Upgrades
  • Heater Replacement
  • Digital Control Upgrades
  • Solar Field Construction
  • New Build Design well as many other state-of-the-art refinement and upgrade projects.


1150 Essington Rd.
Joliet, IL 60435

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