Sargent & Lundy

State Line Station Fossil Separation Project

Retirement of generating station poses separation issues at 138-kV switchyard.

Hammond, Indiana
Client: Exelon Corporation (ComEd)

  • Substation engineering and design
  • Material engineering procurement support
  • Construction field services

Dominion Resource’s State Line Fossil Station was retired as part of a Clean Energy Act initiative.  As a result of the retirement of the station, ComEd’s State Line Switchyard needed to be separated from the generating station. The separation required the installation of all new relay panels inside the existing switchyard control building, a new cable trough system, pedestal boxes, and conduits at the former State Line site, and five remote substations required line and communications upgrades.

Project Scope:

  • Preparation of scope of work documents
  • Design of new relay panels and field cables
  • Design of extension of the existing control building to accommodate a 250-VDC battery
  • Design of new 12-kV feed from the switchyard
  • Material management
  • Testing support

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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.