NSTAR, Scotia Street Substation

Location: Boston, Massachusetts
Owner: NSTAR Electric Utility
Client: Mitsubishi
Engineer: Mitsubishi

Project Summary

In the summer of 2012, NSTAR Electric had a fire at their Scotia Street Substation. The fire destroyed a 115KV transformer and the transmission line terminations, causing a severe power outage for Back Bay, Boston. State Electric was hired to assemble and connect the replacement transformer and install three new115KV GIS circuit breakers and bus in a very restrictive footprint.


The challenge was two-fold: meet a rapid parallel installation timeline for the replacement transformer and the new GIS equipment; and perform the work within the confines of the limited Transformer Bay 110A envelope, which restricted manpower and equipment capabilities, while providing protection to existing in-service equipment supporting NSTAR customers.


State Electric accomplished the installation challenge by stacking the third breaker on top of the two bottom breakers and met the critical timeline with two 12-hour shifts, 7 days a week, expending 8,000 craft man hours and completing the installation in just over 4 weeks ready for testing and commissioning. Throughout this fast-track, complicated project, State Electric’s team of highly trained personnel kept productivity above client expectations.

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