Southwestern Electric Power Co. (SWEPCO), an American Electric Power company, serves more than 543,000 customers in Northwest and Central Louisiana, Northeast Texas and the Texas Panhandle, and Western Arkansas. In October 2021, Irby Construction began a 25-mile rebuild of the Patterson to S. Nashville 138kV transmission line for SWEPCO. 

Located in the southwest corner of Arkansas, the project includes more than 240 structures that meander through marshy territory on Arkansas Heritage Commission property, U.S. Army Corp of Engineers land, and numerous wetland areas. 

This 138kV single circuit transmission project consists of three eight-mile sections and has planned outages so the Irby crew can perform pole work on de-energized lines. The first section is 8.8 miles long and consists of 79 structures. The second section is 8.3 miles with the replacement of 83 structures, and the final section is roughly 8.1 miles with 80 structures. The final line is scheduled to be in-service on November 30, 2023. 

To assist with overall access of the area, Irby has contracted with affiliate company MG Dyess to clear obstacles and tackle the challenging wetland conditions. For the more than 30 Irby crew members who are wrecking out and rebuilding the existing transmission line, MG Dyess is laying thousands of wood mats to access work areas. 

NorthStar Energy Services, another affiliate company, is providing support services by drilling and pouring foundations as well as drilling and setting bases for the direct embed structures. 

From creating entry and overcoming barriers to setting foundations and poles, these coordinated efforts allow Irby to work efficiently and effectively. Irby is exceeding expectations on this job and is committed to the absolute performance required to safely deliver this project on time and within budget. 

Start Date: October 2021
Scheduled Completion: In Progress

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In total, the project consists of 145 miles of new transmission line that will tie into the existing transmission system in Lewiston, ME. Additional project components include upgrading 50 miles of existing alternating current transmission lines, construction of a new converter station, a new substation, and multiple system upgrades.

When the New England Clean Energy Connect (NECEC) project was announced, Irby and Cianbro teamed up to pursue their part in the $950 million that will bring clean energy to 1.2 million households. Leveraging their previous success for Central Maine Power, and staying committed to the win, the Cianbro-Irby joint venture worked for three years on pricing and negotiations. In April 2020, the Cianbro-Irby team was awarded a 145-mile transmission line project from Avangrid. Cianbro-Irby’s scope of work includes all aspects of the DC line construction including foundations, pole setting, framing, and wire stringing operations.

Start Date: December 2020
Scheduled Completion: TBD

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Duke Energy is one of the largest electric power holding companies in the United States, providing electricity to 7.7 million retail customers in six states. In December 2018, Duke Energy contracted Irby to perform the removal and reconstruction of 34 miles of 230kV transmission line from Port St. Joe to Callaway in the aftermath of Hurricane Michael.

The work scope was completed ahead of schedule in March 2019 with no injuries or environmental incidents with the assistance of several key subcontractors including Aldridge Electric, A&J Steel, HeliService Powerline Solutions, FireHawk Helicopters, ROW Masters, Probst Electric, and Thomasson Company.

Start Date: December 2018
Completion Date: March 2019

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The Lower Colorado River Authority (“LCRA”) is a non-profit public utility providing wholesale power to over a million people in Texas. In December 2016, LCRA contracted Irby to construct 33.4 miles of 138kV transmission line from Lampasas to San Saba in central Texas.

The project was executed in consideration of a condensed LCRA schedule and habitat-specific environmental permitting requirements. The Irby scope included steel structures, poles, 22 drilled pier foundations, and a railroad and major highway crossing.

With assistance from fellow Quanta Services subsidiary company North Houston Pole Line (Irby is also a Quanta Services subsidiary (PWR:NYSE)), the project was successfully delivered to LCRA in January 2018.

Start Date: December 2016
Completion Date: January 2018

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