, an 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 51ÂÒÂ×»»ÆÞ began a 25-mile rebuild of the Patterson to S. Nashville 138kV transmission line for SWEPCO.Ìý

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.Ìý

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.Ìý

To assist with overall access of the area, Irby has contracted with affiliate company 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.Ìý

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

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.Ìý

Start Date: October 2021
Scheduled Completion: In Progress

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provides electricity to more than 209,000 customers in Orleans Parish, Louisiana. On Sunday, August 29, 2021, Hurricane Ida made landfall as a Category 4 hurricane with sustained winds of 150 mph. The New Orleans area suffered damage causing outages for approximately 895,000 customers.

As a result of Hurricane Ida, a 475-foot lattice transmission tower in Avondale, a suburb on the west bank of the Mississippi River, was damaged and fell with conductor lines landing in the river. The tower on the Harahan side of the river remained intact with the conductor lines attached. This was a primary circuit for New Orleans and power was rerouted to restore electricity for customers until the damage could be repaired.

Entergy New Orleans contracted with Irby to manage the project from beginning to end. The removal of the destroyed transmission tower’s lines in the Mississippi River was a national priority. Efforts included coordinating with the Army Corps of Engineers, U.S. Coast Guard, Levee District, Louisiana State Police, Jefferson Parish EOC, the Governor’s Office of Homeland Security and other agencies to ensure safety and minimize risks.Ìý Ìý

To safely remove the wire from the tower, clearing the downed conductor lines was completed by through a series of controlled detonations. Explosives were attached to the conductor lines on both sides of the tower and demoed in sections.Ìý

Once the lines and old towers were cleared away, , LLC, completed pile driving work and Irby sister company installed anchor bolted piers to resist uplift forces that might otherwise cause the new tower and lines to be extracted from the ground.

With foundations in place, Irby, , and erected two 475-foot towers to supersede the old ones. With only 6 hours a day permitted by authorities to shut down major river traffic, Irby has begun stringing the lines using barges across the 3,700-foot span of the Mississippi. Once that is complete, energizing the lines is the last step in bringing this major transmission system back to life.

Irby is proud to have been recognized by our client, Entergy, for our work on this project as a Premier Vendor for Customer Centricity. Watch the

For more details and background on this project, visit .
to read the T&D World feature on this project.

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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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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 , , , , ROW Masters, , and .

Start Date: December 2018
Completion Date: March 2019

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The (“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 subsidiary company Ìý(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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The (“LCRA”) is a nonprofit public utility established to provide quality of life to Texans through water stewardship, energy, and community service.

In November 2017, LCRA contracted Irby to upgrade a 13.9 mile 69kV transmission line between its Harwood and Waelder substations to 138kV capable. The Irby scope included the replacement of 112 structures to complete the conductor upgrade and the installation of OPGW shield wire from Waelder to Flatonia substations.

The Irby upgrades (including foundations, tangents, and dead ends) were performed on energized lines with support from and (Both Irby and Probst are companies (PWR:NYSE)). Completed to schedule in May 2018, the project was delivered to budget and with zero lost time incidents.

Start Date: November 2017
Completion Date: May 2018

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(a parent company of ) is a wholesale electricity supplier with a portfolio of facilities totaling more than 21,000MW of electric generating capacity in the United States and Canada. In January 2018, NextEra contracted Irby to construct 68.3 miles of 500kV transmission line (single circuit, triple bundled) between Palm Beach and Miami-Dade counties (Corbett and Sugar substations to Quarry substation) in support of a critical tie-in for the NextEra’s Florida grid.

The Irby scope includes site survey, clearing, construction of access roads and pads, pier foundations and anchor pile installation, and setting steel structure and deadends with approximately 15 miles of the construction right of way transversing protected Everglade canal waterways.

In observance of the projects environmental requirements Irby crews adapted novel technical solutions including the use of barges, concrete pump lines, and amphibious equipment.

Start Date: January 2018
Completion Date: May 2019

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Irby was contracted by the (“SRP”) to construct the Palo Verde to Pinal West 500kV transmission line in March of 2007. Serving six utility districts including the Salt River Project, this line consisted of 52.4 miles of single circuit triple bundle conductor (up to 1,400 MW capacity) on approximately 205 self-supporting lattice steel towers.

Foundation work for the project was performed by fellow subsidiary company , and the helicopter leadline was performed by. The project was successfully delivered in May of 2008.

Start Date: March 2007
Completion Date: May 2008

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(“SRP”) is an Arizona state public electrical utility serving the Phoenix metropolitan area.

In January 1994, SRP contracted Irby to construct 256 miles of 500kV transmission line including 956 towers between Mead and Phoenix. Running parallel to the pre-existing Mead-Liberty 345kV line, the project incorporated the first application of a 500kV phase shifting transformer enabling 1300MW transmission capacity up to 2200 MW to Southern Nevada. The project was successfully delivered to SRP in September of 1995.

Start Date: January 1994
Completion Date: September 1995

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In March 2016, Irby 51ÂÒÂ×»»ÆÞ was contracted by the (“LCRA”) to perform the Marshall Ford to Lago Vista 138kV Transmission Line 51ÂÒÂ×»»ÆÞ Project. The project scope included the replacement of a 1.3 mile transmission line across Lake Travis plus the upgrade of an existing 14.5 mile transmission line (69kV to 138kV).

Irby 51ÂÒÂ×»»ÆÞ successfully completed this project in April of 2016 to schedule and budget.

To learn more about this project, click

Start Date: March 2016
Completion Date: April 2016

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