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Project logoThe Middletown-Norwalk Transmission Project

Middletown to Norwalk, CT

Route Length
Municipalities Along the Route (18)
Regulatory Review
Construction Details

Route Length
69 miles of new 345-kilovolt (kV) line (345,000 volts)

  • 45 miles of overhead
  • 24 miles of underground (six miles constructed by the United Illuminating Company)
  • Includes 57 miles of reconstructed 115-kV line (115,000 volts) to facilitate installation of 345-kV on existing rights of way

Upgraded Scovill Rock Switching Station, Middletown
New Beseck Switching Station, Wallingford
New East Devon Substation, Milford
New Singer Substation, Bridgeport (United Illuminating)
Upgraded Norwalk Substation, Norwalk

Municipalities Along the Route (18)
Middletown, Haddam, Durham, Middlefield, Meriden, Wallingford, Cheshire, Hamden, Bethany, Woodbridge, Orange, West Haven, Milford, Stratford, Bridgeport, Fairfield, Westport, Norwalk.

Regulatory Review

  • The Connecticut Siting Council
  • Connecticut Department of Environmental Protection
  • Connecticut Department of Public Utility Control
  • ISO New England
  • Federal Energy Regulatory Commission
  • Army Corps of Engineers

$955 million (CL&P's portion of the overall $1.27 billion project)


  • November 2001 to May 2003: Consultations with municipalities potentially affected by proposed route (nearly 50 in total).
  • May 2003: Regulatory review begins.
  • Summer 2003: Begin Open Houses; sessions held at 21 locations along the proposed route.
  • October 2003: Joint filing of Application to the Connecticut Siting Council by CL&P/UI.
  • October 2003 to April 2005: The Connecticut Siting Council held more than 35 public and evidentiary hearings for the project application.
  • April 7, 2005: Connecticut Siting Council approves project.
  • April - October 2005: Consultations with municipalities and residents on proposed design (nearly 270 requests for information or design changes received).
  • April 2006: Construction begins, Beseck Switching Station, Wallingford
  • June 2006: Construction begins on underground transmission line.
  • August 2006: Construction begins on overhead transmission line.
  • September 2006: Construction begins on Scovill Rock Switching Station, Middletown.
  • December 2006: Construction complete on Scovill Rock Switching Station, Middletown.
  • February 2007: Construction complete on Beseck Switching Station, Wallingford.
  • April 2007: Construction begins on East Devon Substation, Milford.
  • July 2007: Construction begins on Norwalk Substation, Norwalk.
  • July 2008: Construction complete on overhead transmission line.
  • August 2008: Construction complete on East Devon Substation, Milford.
  • September 2008: Overhead lines energized.
  • October 2008: Construction complete on Norwalk Substation, Norwalk.
  • December 2008: Construction complete on underground transmission line.
  • Energization Complete: December 16, 2008.

Construction Details

  • General:
    • The project was completed nearly a year ahead of schedule and $95 million under budget.
    • Over 2.7 million man-hours worked during a three-year period.
    • Over 3,800 people employed throughout the duration of the project; 1,200 people at its peak.
    • The project's stellar safety record (DART rate = 0.15) was ten times lower than the Bureau of Labor Statistics' national average rate.
    • Materials and equipment supplied by several countries outside the U.S., including Canada, France, Italy, Germany, Brazil, South Korea and Japan.
  • Overhead:
    • Installed 738 structures.
    • Structure heights ranged between 30 ft. and 195 ft.; average structure height was 112 ft.
    • Strung 760 miles of wire.
    • Poured nearly 3,000 truck loads (29,600 cubic yards) of concrete.
    • Used helicopters to construct much of the project’s overhead portion to string power lines from tower to tower, reducing construction time and lessening environmental impacts.
  • Underground:
    • Installed cable along a 24 mile-route, the longest continuous section of cross-linked polyethylene (XLPE) underground conductor cable used anywhere in the U.S.
    • Installed 116 underground splicing vaults and 372 splices.
    • Poured more than 9,500 truck loads (95,000 cubic yards) of concrete.
    • Used “horizontal directional drilling” technology to install underground cables to cross the Saugatuck River in Westport, the Housatonic River in Milford, and Ash Creek on the Bridgeport/Fairfield town line.
  • Substations:
    • Poured nearly 500 truck loads (4,979 cubic yards) of concrete.
    • Erected over 400 tons of steel.
    • Installed nearly 100 miles of wire.
    • Major equipment installed includes 32 circuit breakers; 6 auto transformers; and 2 shunt reactors.

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