Waukegan Substation

Soil contamination and high water tables present challenges to substation design

Waukegan, Illinois
Client: Exelon Corporation – ComEd

The expansion of the existing 345/138-kV substation increased load flow capacity as well as strengthened reliability of the regional transmission system.  Sargent & Lundy provided:

  • Transmission line engineering and design
  • Overhead transmission and distribution design
  • Equipment specifications and material procurement
  • Construction monitoring and quality assurance

Project Scope:

  • Equipment and facilities included:
    • Two (of ultimately four) 345/138-kV 300-MVA transformer banks
    • Seven breakers (14 ultimate) 345-kV GIS
    • 138-kV outdoor steel box structure with 138-kV breakers, 138-kV 115-MVar capacitor banks, 14 line positions
    • Four 345-kV transmission line reroutes
    • Fourteen 138-kV transmission line re-routes
    • Two new relays, controls, and communications buildings for the 345-kV and 138-kV yards
    • Fourteen remote-site substation relay and fiber upgrades
  • Site demolition engineering
  • Site engineering for contaminated soil and a high water table
  • Procurement support of major equipment, construction contracts, and minor materials
  • Outage planning and sequencing
  • Development of overall engineering/construction schedule
  • Onsite construction management team providing material tracking, QA/QC, site logistics, contractor and ComEd coordination, and interface with Waukegan station and governmental agencies
  • Development of operating procedures

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For more information about our services, please see our Power Transmission page.

Todd Hanssen

Senior Vice President




Todd brings 25 years of experience in the design of power generation and transmission projects and is currently the director of power transmission construction services.