Project Description

National Grid's Palmer to Ware Improvement Project is a proposed transmission line project upgrading the O15N electric transmission line. The upgrade will focus on portions of the 10.35-mile-long segment of overhead power lines southeast of downtown Palmer, crossing Route 20 and the Massachusetts Turnpike (I-90), continuing northeast until it crosses Route 9 and Route 32 located northeast of downtown Ware. Although the line will be rebuilt to a 115 kilovolt (kV) standard, it will continue to operate at 69kV for the foreseeable future. Once upgraded, the newly rebuilt transmission line will provide enhanced electric reliability for the region.

Project Benefits

  • Replacement of Infrastructure: The existing line has widespread damage that poses a great risk to the reliability of the transmission line. The Project will modernize this infrastructure to ensure the continued safe and reliable delivery of electricity to the region.
  • Improved Communications: The Project will replace the existing shield wire with Optical Ground Wire (OPGW) that will help to shield the line from lightning strikes. This improvement will also enhance communications between substations, thereby improving network resiliency and reliability.
  • Increased Transfer Capabilities: With the installation of larger conductor (wires), electric power transfer capabilities along the line will be improved to better meet the area's current and future electric load needs.
  • Cost-Effective Solution for Years to Come: Rebuilding the transmission line provides a cost-effective solution for the continued long-term maintenance and operation of the line.
  • Safety and Reliability: The creation of new and improved access roads will provide for safer and quicker identification and repair of outages along the line which will reduce restoration times.

Download the Open House Invite


  • EENF Filing projected for May 2024
  • EFSB Filing projected for July 2024
  • NHESP Consultations Spring/Summer 2024
  • Army Corps of Engineers – Section 404 General Permit to be filed Winter 2025
  • NOI Filings January 2026
  • MassDEP Water Quality Certification – Notification to be filed February 2026
  • Local Permitting
    1. Conservation Commissions – Wetlands Protection Act Order of Conditions
    2. Local Municipal Permits (if needed)

Document Library

Title Date
O15N Project Introduction 11/18/2022
O15N Fact Sheet 03/25/2024
Open House Invite 04/29/2024

Frequently Asked Questions

Project Map

Interactive Project Map Quick Guide

  • Type address of interest in Address Lookup to view location in relation to project route
  • Click on a camera icon to view a visual simulation as it pertains to that location
  • Click a colored segment on the map to view a representative cross section profile of that segment
  • Click segments in map legend to highlight or hide segment
  • Click Reset Map to restore map to original view
  • Use icons on lower right as you would on a Google Map


Construction Process

Rebuilding an electric transmission line involves a variety of activities set out in phases. Below are sample descriptions and photos; actual construction sequencing, methods, and materials will vary.

aerial photo of a marshelling yard

1. Site Preparation:
The first phase of site preparation and construction is tree and brush removal. Vegetation maintenance allows construction crews to build access roads and remove trees in danger of falling into transmission lines.

photo of a bucket loader

2. Environmental Controls:
Next, environmental controls would be installed to mitigate construction impacts to the area. These can include matting, silt fences, and concrete washout structures and containers, among others.

photo of transmission lines and a truck servicing them

3. Transmission Line Rebuilding:
The next phase would be transmission line rebuilding, where foundations are poured, structures are spotted and erected, fiber optic cable is installed, and new wire is strung and energized. Old structures will be removed from the right-of-way. This work would be done with a variety of equipment, including cranes and other heavy equipment.

transmission lines in an open field

4. Restoration:
The final phase of construction is ground surface restoration, in which the construction area is restored to its pre-construction condition (unless otherwise specified in regulatory requirements or landowner agreements).

Construction Schedule

Dates Task
June 2023 – Ongoing Stakeholder Outreach
March 2023 – Ongoing Field Assessments
Spring 2023, Summer 2027 Vegetation Management
July 2024 – July 2027 Permitting
July 2027 Access Improvement Start
June 2028 Line Construction Start
November 2028 Construction and Restoration Finish
December 2028 In-Service/Ready for Load

*All dates are subject to change, please check back*

Get in Touch

For more information about the Palmer to Ware Improvement Project, please send us an email or call us at (800) 674-9510.

Contact Us

National Grid
P: (800) 674-9510
E: [email protected]