About Us - consultants since 2012 - Over 30 years of experience

 Based near Boulder, CO,   

EPSIM provides independent consulting services to utilities, industrial operators, infrastructure owners, and public agencies.

Our work focuses on one objective: helping clients make sound decisions regarding critical assets, operations, and infrastructure investments.

The combined expertise and experience in specialty engineering and utility management fosters the incubation of ideas that transcend traditional silos of consulting.  

Nils Tellier, PE, brings more than three decades of experience across utility operations, industrial gas systems, infrastructure planning, asset management, and capital project execution.

He has advised organizations responsible for critical infrastructure assets on matters ranging from operational performance and strategic planning to major capital investments and organizational effectiveness. 

   Nils Tellier, PE, founded EPSIM in 2012. He is a Professional Engineer licensed in Arizona and Colorado.  He is a volunteer firefighter for Boulder Mountain Fire Protection District.  He is also fluent in French and Spanish.

 Francis Campos received a PhD in chemical physics from Purdue University and did postdoctoral work at the Joint Institute for Laboratory Astrophysics in Boulder, Colorado. He then spent 24 years as an engineer developing and manufacturing magnetic recording heads for data storage products. His interest in improving the analyses on which decisions were based while adhering to shrinking budgets led him to develop customized calculations and visualizations using freely available statistical packages. He is now independently providing cost efficient, customized analysis to EPSIM customers.