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ColliSys maintains a professional affiliation with several unions and associations. We utilize their expertise for safety and professional training, uphold their apprenticeship and worker standards, and honor their business ethics programs. Our
Ouachita Electric Cooperative Corporation is a Camden, AR-based company in the Energy and Utilities sector.
Marshall Excelsior is a Marshall, MI-based company in the Energy and Utilities sector.
Midwestern Mechanical is a Sioux Falls, SD-based company in the Energy and Utilities sector.
Kennebunk Light is a Kennebunk, ME-based company in the Energy and Utilities sector.