The 115 kV Substation & Transmission Line . . .Meeting Belmont's Long-Term Electricity Needs

 

On December 15, 2016, Belmont Light officially transferred ownership of a newly constructed 115kV Transmission Line to Eversource, and in doing so effectively closed out the development phase of a new electricity distribution system that will serve Belmont consumers for decades to come.

The new 115kV Transmission Line runs from the Alewife electric gird in Cambridge to feed a new 60 megawatt substation at Blair Pond in Belmont that will provide a newer, more reliable and better quality electric service for all Belmont users.  The new electric distribution system is the result of several years of analysis, planning, design and construction aimed at combating Belmont’s growing concerns in the areas of capacity, age of infrastructure, and reliability of its electric delivery system.

In assessing these inevitable limitations of its aging distribution system, in 2012 Belmont Town Meeting approved $53.7 million in new bonding capacity to address these concerns and develop a solution.  With the support of Town Meeting, Belmont Light worked with industry experts, the Massachusetts Department of Public Utilities, the Independent Service Operators of New England, Belmont Town Officials and Eversource, the owner of Belmont’s electric supply interconnection at Alewife, to develop the most efficient and cost effective solution for Belmont’s ratepayers.  The result of this collaboration and analysis includes not only the new 60 megawatt Blair Pond Substation and 115kV Transmission Line, but also a Joint Development Agreement signed between Belmont Light and Eversource which transfers ownership of the 115kV Transmission Line to Eversource after construction.

With the agreement to transfer ownership of the new transmission line to Eversource, Belmont’s construction costs for the overall project, after reimbursement from Eversource, dropped by $28 million.  As a result, Belmont’s total cost for the Blair Pond Substation and Transmission Line project, anticipated to be $53.7 million, actually closed out at $26.1 million, a $27.6 million savings for Belmont ratepayers.  A corresponding rate increase associated with the cost of this project that was originally anticipated to be approximately 14% for Belmont Light customers is instead 6%, an increase that has already been factored into rates. 

With the new 115kV transmission line energized, its ownership transferred, and all interconnections at the Blair Pond Substation made, all major phases of the Blair Pond Substation and Transmission Line project have been completed.  Upon completion of the final distribution phase of the project within Belmont, the new Substation will begin to provide the next generation of electricity distribution for all Belmont electric users beginning this spring.


About the Project

Belmont Light is one of just 41 municipal light departments in Massachusetts. Being a community-owned utility, we are able to provide more personal customer service, retain a workforce dedicated solely to the maintenance and repair of Belmont’s power needs, and preserve flexibility to positively impact our customers’ electric rates.

The ability to continue providing this unique value to Belmont’s electric customers became severely jeopardized over recent years due to mounting system capacity issues, an aging infrastructure, and corresponding power quality issues. The new Blair Pond Substation and the 115 kV transmission line that will interconnect the new substation at Alewife in Cambridge is the solution that will provide long-term stability to Belmont's electric needs for decades to come.

Construction of both the Blair Pond Substation and the 115kV Transmission Line are now complete. Full energization of the project occurred in December 2016. 

 



 

Project FAQs

Visit our Blair Pond Substation & 115 kV Transmission Line FAQs page for answers to some of the mostly asked common questions about the Blair Pond Substation and 115 kV substation Project. 


Still Have Questions?

Dial our dedicated project hotline anytime at 617-993-2845. 


 

Smart Grid Project

Belmont Light completed the modernization of its infrastructure through its advanced metering project in 2016. The project entailed the installation of state-of-the art hardware, software, and communications networking equipment that provides opportunities for energy savings, operations efficiency, enhanced customer service, and reduced energy costs. The “smart” electric meters installed as part of the project communicate via a highly secure, town-wide, 900-MHz private network. Data collected from these meters is made available to customers through Belmont Light’s web portal, SmartHub, making it easy to analyze and manage their electricity usage. 

The Smart Grid is a physical and communications link between your home or business and the utility infrastructure that delivers your energy. Smart meters measure your electricity use in defined increments daily as opposed to the traditional process of taking single monthly reads. The data collected from smart meters permit advanced visibility of customer consumption patterns, enabling customers to better manage their energy use. Smart meters also act as sensors and remote controllers that help the utility gauge what’s happening on the system and will allow Belmont Light to locate specific problems faster to avoid outages. Distribution automation will allow Belmont Light to remotely make any necessary flow adjustments on the system, facilitate outage management, and improve power quality throughout the system.

The Smart Grid project provides Belmont Light with a better understanding of system demand, congestion, and balancing. The analysis of these data creates opportunities for energy savings and operations efficiencies, ultimately improving electricity rate calculations and your energy costs. Upcoming Smart Grid enabled programs and developing technologies will provide every Belmont customer with the knowledge and tools needed to meet conservation goals, save energy, and reduce electricity bills.