Glenbrook Cables Project

Glenbrook Cables Project

Location: Stamford to Norwalk, Conn.

Client: Northeast Utilities Service Co.

Completion Date: November 2008

Burns & McDonnell was selected by Northeast Utilities Service Co. and its subsidiary, Connecticut Light & Power (CL&P), as a program manager of choice. Program management provides for all an owner's project delivery needs as they relate to a large and complex effort involving the construction of multiple facilities over a several year period. The program manager is an agent of the owner and serves as a single point of management throughout the lifespan of a project(s). A program manager provides detailed managerial support with added technical value to the owner and is normally involved from the earliest stages of a project.

During the initial stages of the project, CL&P retained Burns & McDonnell to assist in the preparation of an application to the Connecticut Siting Council (CSC) for a Certificate of Environmental Compatibility and Public Need to construct a new 115-kV double circuit transmission line and associated substation upgrades. The 9-mile project extended between the existing Glenbrook Substation in Stamford, Conn., to the existing Norwalk Substation in Norwalk, Conn.

Burns & McDonnell acted as the primary consultant providing preliminary engineering and design services and identification of a preferred route as part of the CSC regulatory process. Burns & McDonnell assisted CL&P in the identification and evaluation of routes, development and participation in the public involvement process, the compilation of municipal recommendations and the preparation of the CSC application documents. Overall, Burns & McDonnell was responsible for $30 million of this $185 million project.

Underground route alternatives were identified by Burns & McDonnell for consideration and evaluation. Routes around existing transmission, rail corridors and public streets and highways were considered and evaluated for underground construction based on sound environmental, social and engineering factors typical for similar voltage lines in the region. Using geographic information system technology, Burns & McDonnell also identified appropriate locations for river crossings and determined necessary methods for the crossings to minimize impacts. Our team provided preliminary engineering support to CL&P for the design and cost estimates for proposed underground alternatives and assisted with the preliminary design and cost estimates for the substation upgrades.

The Glenbrook Cables Project was successfully energized in November 2008, ahead of schedule.

  • Routing design
  • Regulatory filings
  • Environmental studies
  • Transmission line and substation engineering
  • Surveying, geotechnical, utility locating, environmental testing
  • Permitting
  • Request for proposal development and evaluation
  • Construction management and inspection
  • Easement acquisition
  • Safety program monitoring
  • Public relations
  • Procurement
  • Scheduling
  • Cost control
  • Document control
  • Soil disposal solutions
  • Tight schedule and budget constraints
  • Nine-mile double-circuit 115-kV underground transmission line
  • Congested urban construction primarily under state and town roadways
  • Built-out for future three-circuit 345-kV upgrade
  • 3500 kcmil XLPE cable
  • Project control systems include Primavera P3e/c scheduling and Expedition document control and change management