Northeast Utilities picks Siemens for gas insulated transmission project

Orlando, Fla., February 9, 2011 — Siemens Energy, Inc. won a contract by Northeast Utilities for 115 kV and 345 kV gas-insulated transmission lines for the Agawam and North Bloomfield substation additions.

The additions are a part of the Greater Springfield Reliability Project, one of four transmission projects comprising the New England East-West Solution.

The project is designed to address transmission system overload and meet current federal and regional reliability standards. For the GITL portion of the project, Siemens will provide all engineering, design, assembly, construction and commissioning activities, including the technical studies, controls design, apparatus testing and quality management.

Construction on the Greater Springfield Reliability Project started in substations in Massachusetts in late 2010 and will start in Connecticut in late 2011. The estimated in-service date is 2013.

Siemens will build five circuits at two air-insulated substations located seventeen miles apart in Massachusetts and Connecticut for Northeast Utilities for a total length of one mile. Northeast Utilities will implement GITL technology at two different substations.

The Agawam substation will contain two circuits at 345 kV and two circuits at 115 kV, while the North Bloomfield substation will use one circuit at 345 kV. The GITL is fitted with elbows and angle adjustment components to simplify the foundation design and use standard precast trenches. The GITL design minimizes the overall civil work costs for Northeast Utilities.

The GITL will run underground and then connect to above-ground bushings on both AIS. The GITL technology carries high current ampacity on one single conductor, whereas the same current would need two or three cables in an AIS application. GITL has significantly lower losses, a lower magnetic field and no risk of burning compared to cables or overhead lines.

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