09/03/2026
to a defining chapter in Irby Construction Company history.
In 1969, Irby completed the first 765 kV transmission line built in the United States, a 31.5-mile line constructed for American Electric Power in Kentucky. In the years that followed, Irby built more than 900 miles of 765 kV line across Ohio, Indiana, and West Virginia, ultimately constructing more than 90% of America’s 765 kV grid.
Nearly six decades later, we’re proud to be working with AEP again and continuing a relationship built on trust, quality workmanship, and a shared commitment to strengthening America’s electric infrastructure.
Quanta Services, Inc.