Eversource notifies Massachusetts regulators of substation project completion

NSTAR Electric d/b/a Eversource Energy (NYSE:ES) earlier this month told the Massachusetts Department of Public Utilities (DPU) that the Mashpee substation was energized last June and has been placed in service.

As of Oct. 13, 2017, all project construction, including the completion of enhanced landscaping in the vicinity of an access road entrance, was completed, the company said.

As noted in the filing, the DPU in April 2015 issued a final order in connection with the company’s Mashpee Substation Modification Project, which consisted of the expansion and upgrade of the company’s existing Mashpee Substation No. 946, located in Mashpee.

Specifically, the filing said, the company expanded the substation site from about 30,000 square feet to about 60,000 square feet, as well as:

  • Installed a second 30/40/50 MVA 115-kV to 23-kV transformer
  • Installed a second 23-kV bus section for four 23-kV feeders, and a 4.8-MVAR switched capacitor bank
  • Replaced the existing open 23-kV bus with enclosed, metal-clad switchgear
  • Added an auto-bus restoral scheme
  • Installed a new control center
  • Relocated one existing 23-kV distribution feeder to connect to the new 23-kV bus section
  • Built a new 23-kV feeder underground to Orchard Road to serve local load on Route 28
  • Replaced the existing 115-kV arrangement with a 115-kV bus with two 115-kV circuit breakers to sectionalize Line 136 between the Falmouth Tap and the West Barnstable substation

The company also noted that it installed a 20-feet-high, three-sided sound wall to the south, east, and west of the two transformers at the substation.

In addition, the company said that it developed a community outreach plan for project construction and operation in consultation with the Town of Mashpee in accordance with the order.

Among other things, the company said that it conferred with the relevant air safety authorities, and no height restrictions or other requirements were imposed by those authorities regarding the project. Furthermore, the company said that it used no herbicides during the course of the project.

The company noted that it, its contractors and subcontractors have complied with all applicable federal, state, and local laws and regulations for which the company has not received an exemption, including those pertaining to noise, emissions, herbicides, and hazardous materials.

As TransmissionHub reported, according to the company, the project is needed to maintain reliability and increase the capacity of the electric system serving the greater Mashpee and Barnstable area.

About Corina Rivera-Linares 3286 Articles
Corina Rivera-Linares was TransmissionHub’s chief editor until August 2021, as well as part of the team that established TransmissionHub in 2011. Before joining TransmissionHub, Corina covered renewable energy and environmental issues, as well as transmission, generation, regulation, legislation and ISO/RTO matters at SNL Financial from 2005 to 2011. She has also covered such topics as health, politics, and education for weekly newspapers and national magazines.