About Us

TransCo.Energy, LLC (TRANSCO) is a technical consulting company that provide services in the areas of system planning, operations, interconnection support and energy development. Established in July 2015, TRANSCO is registered in the State of Arizona, a member of the Western Electricity Coordination Council, and headquartered in Tempe, Arizona. TRANSCO is owned and staffed by three Professional Engineers with over 50 years of combined experience in transmission planning, operations and energy development. We are active participants in the WECC and other subregional technical groups in southwestern United States.

Mark Etherton, P.E. --President
  - 31 years system planning, substation design, development and management experience
  - Professional Engineer Registered in State of Arizona
  - Project Manager and Engineering Manager for SUNZIA 500 kV Southwest Transmission Project

Jonathan Stahlhut, Ph.D., P.E. -- Vice President
 - 9 years of system planning and operations experience
 - WECC Path Rating, TTC/MOD-29, TPL, FERC SIL, and Interconnection Studies
 - Professional Engineer registered in State of Arizona

John Kyei, P.E. --Vice President
 - 14 years of system planning and energy development experience
 - WECC Path Rating, TTC/MOD-29, TPL, Model Development, and Interconnection Studies
 - Professional Engineer registered in State of California