Black and Veatch upgrading Connecticut transmission network

New Haven, Conn., February 15, 2010 – The United Illuminating Co. selected Black and Veatch Construction to modernize a component of its transmission network that serves more than 324,000 electricity customers in southwestern Connecticut.

The Grand Avenue switching station, located on four-acres in New Haven, Conn., is a key part of the overall New England transmission network that serves more than 14 million customers across the northeast region of the U.S.

Seven major electric transmission lines converge at the Grand Avenue switching station, which was completed in 1975. The age of the equipment, configuration of the station, and changing industry standards all contribute to the need to modernize the station’s facilities.

Black and Veatch is providing complete engineering, procurement and construction services for the $60 million modernization project that involves developing a new, indoor switching facility that uses gas-insulated switchgear technology. The project will also involve the reconfiguration of four overhead and three underground transmission lines.

The project is scheduled for completion in 2012.

The $60 million project cost estimate is referenced from the ISO-NE Planning Advisory Committee’s Sept. 30, 2009, update.

The existing 115-kiloVolt (kV) open-air facility is located on UI’s existing property at 520 Grand Avenue in New Haven, Conn. The facility is the termination point for seven 115-kV transmission lines (four overhead and three underground).

The new, 115-kV switching station will be completely contained within UI’s existing property.

The facility will be arranged in a breaker and a half configuration using 12 SF6 insulated circuit breakers. The project will bring the station into compliance with regional electric system standards.

The United Illuminating Company is a New Haven-based regional electric distribution company established in 1899. UI is engaged in the purchase, transmission, distribution and sale of electricity and related services to more than 324,000 residential, commercial and industrial customers in the Greater New Haven and Bridgeport areas.


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