_ M/N 345-kV Transmission Line Project Completed

The Middletown/Norwalk transmission line project, one of the largest electric infrastructure upgrades in the country, was completed early and under budget. A joint effort of UI and Connecticut Light & Power, the project consisted of 69 miles of 345-kilovolt (kV) high-voltage transmission lines through 18 Connecticut cities and towns.

UI’s cost was approximately $290 million. Construction of the M/N project included 45 miles of overhead lines and 24 miles of underground lines. In addition, the project had a stellar safety record — including 725,000 hours worked by UI with zero recorded incidents.

_ Ensuring Reliability –
Building North America’s Largest GIS Substation

UI completed construction of North America’s largest 345-kilovolt Gas Insulated Switchgear (GIS) substation in Bridgeport, Connecticut. Utilizing advanced technology, Singer Substation was built safely and efficiently within an urban environment and inner city residential neighborhood. The substation was the cornerstone of improvements that were planned to the electric system serving southwestern Connecticut, an area identified by the Federal Energy Regulatory Commission (FERC) as one of the nation’s top ten reliability risks. Constructed ahead of schedule, Singer Substation was completely energized and carrying load in December 2008.