Project Included

115kV Transmission Line Rebuild—New Hampshire

May–June 2020

Riggs Distler was contracted to upgrade aging tower infrastructure along an important 115kV electrical transmission line in New Hampshire. In order to modernize the line and ensure safe operation well into the future, multiple wooden tower structures were replaced with directly embedded, weathering steel structures. The existing towers were affected by bird and insect damage, compression breaks, buckling/leaning, and degradation due to rot and decay. Our work included:

  • Replace 7 wooden tangent structures with new weathering steel tangent structures. 
  • Replace 4 wooden running angle structures with new weathering steel running angle structures. Install cassions for all non-ledge set structure replacements 
  • Install new guy anchors will be required. 
  • Extensive environmental matting for access roads, environmental controls, and site support. 

Challenges Overcome

Riggs Distler’s greatest challenge on this project was the terrain. The work sites for each tower were located in remote areas, and our drilling and line crews had to use full-track equipment to access the tower sites and complete the work. Work had to be carefully planned and contingencies built into the daily schedule, as there was no cell phone or wifi service to connect to support staff in our offices. The project had to be completed within strict outage windows specified by the client, and our main focus in the field was keeping up with the project schedule while performing all work safely. 

Results Delivered

Despite the challenges faced, Riggs Distler completed all work on schedule and completed the upgrade of our client’s transmission line infrastructure, ensuring safe operation and reliable electrical service for power users throughout the area. As a result of our performance, the client secured Riggs Distler’s services for four additional projects in New Hampshire, which are currently underway. 

Project Included

Case Studies

15-Mile 69kV Transmission Line Rebuild—Southern New Jersey
2021
Riggs Distler was contracted to modernize and upgrade the performance of a major electric transmission line connecting two substations in southern...
COC for Overhead Transmission Projects—DE, PA, NJ, MD, IL
January 2021–December 2025
Riggs Distler is the Contractor of Choice for all installation, maintenance, and repair work performed on our client’s electrical transmission...
115kV Transmission Line Rebuild—New Hampshire
May–June 2020
Riggs Distler was contracted to upgrade aging tower infrastructure along an important 115kV electrical transmission line in New Hampshire. In order...
Great Egg Harbor Crossing Rebuild Project—New Jersey
September–December 2020
Riggs Distler was contracted to assemble and install eight electric transmission towers to provide improved electrical service to customers in...
K43 Fiber Project - Vermont
January-June 2020
Riggs Distler was contracted to install 21 miles of new ADDS fiber-optic cable and support braces on a 115kV transmission line stretching from...
Switching Station Spare Transformer — New Jersey
February–May, 2020
February–May...
24-Mile 138kV Transmission Line Rebuild — Monee, Illinois
January 2016-January 2017
Our host utility needed to replace an aging 138kv transmission line stretching 24 miles across northeastern Illinois. Working under a tight, ...
Hurricanes Katrina, Rita and Wilma Emergency Power Restoration — Louisiana, Alabama, Florida, Mississippi
August-December 2005
In 2005, Riggs Distler was hired to help restore power to areas affected by the devastating Hurricanes Katrina, Rita, and Wilma. It’s estimated...
Hurricane Sandy Emergency Power Restoration — New Jersey
November 2012
As Hurricane Sandy’s landfall along the mid-Atlantic coast became imminent, Riggs Distler immediately set to work preparing vehicles, equipment,...
Post-Hurricane Power Restoration — Puerto Rico
2017–2018
After multiple Category 3+ hurricanes decimated the Puerto Rico Electric Power Authority grid in 2017, Riggs Distler quickly mobilized to help...
13kV & 23kV Circuit Refurbishment — Massachusetts
2015–2018
Riggs Distler was contracted to reconductor approximately 20 miles of 13kV and 23kV circuits and replace over 500 wooden utility poles for an...
Susquehanna River Transmission Line Crossing — Pennsylvania
2017
Riggs Distler completed this difficult reconductoring project for a transmission line spanning the Susquehanna River. The 1.1-mile river crossing is...
30-Mile 138kv New Build/69kV Transmission Line Rebuild — Virginia & Maryland
2017–2018
Riggs Distler rebuilt 30.9 miles of 138/69kV transmission line over five different outage windows in 2017–18 to deliver improved electric...
41-Mile 230kV/138kV Transmission Line Rebuild — New Jersey
November 2017–May 2019
Riggs Distler was selected as the general contractor on this important transmission line rebuild. Project will deliver a more capable and reliable...