Transmission Lines


Tehachapi Renewable

Description: With a goal established that by 2020, 33% of all energy in the state of California was to come from renewable sources, the Tehachapi Renewable Transmission Project was developed by Southern California Edison to deliver wind energy from the California desert to the urban center of Los Angeles. Tri-State was subcontracted by Wilson Construction…

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Meadowbrook-Loudon 81 - Version 2


Description: Dominion’s Meadowbrook-Loudoun is a 65-mile 500-kV transmission line (part of the Trail Project), located in northwest Virginia, southwest of Washington D.C. The project crosses some rugged uplands, as well as a corner of the Manassas National Battlefield Park. As subcontractor to The L. E. Myers Company, Tri-State installed 1,960 foundations for a mix of…

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Front Royal Going in with the Core Barrell


Description: Arrowhead-Weston is a 220-mile transmission line connecting Duluth, Minn., with Wausau, Wis. The project, built by Wisconsin Public Service and owned by American Transmission Company, included 1,564 structures, with foundation sizes ranging up to 13’-dia. by 62 feet deep. Unique challenges included boulders the size of trucks, blasting granite near existing poles, and managing…

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CAPX La Crosse-img

CAPX2020 La Crosse

Description: After the need was determined for an electrical interstate system connecting Minnesota, South Dakota, and Wisconsin the CAPX2020 initiative was born.  CAPX2020 was broken up into several segments and managed by various owning power companies.  Tri-State was contracted to complete much of the Hampton – La Crosse 345 kV Transmission Line by Xcel Energy. …

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Good initial cleanup results achieved at foundation pad locations

Center to Grand Forks

Description: Starting in the spring of 2012 crews began work on the mammoth 1352 foundation project from Center to Grand Forks, ND.  The Minnkota Power-owned 345 kV transmission line spans the Missouri River in the west then continues through the farm fields and prairies to bring electricity to the communities of eastern North Dakota and…

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Description: One of the largest and toughest jobs in Tri-State’s 60-year history, CP&L’s Middletown-Norwalk included 45 miles of 345-kV. Line in Middlesex, New Haven, and Fairfield Counties in Connecticut.  Tri-state’s portion (as subcontractor to Par Electrical Contractors) required 610 foundations and nearly 23,000 cubic yards of concrete.  The soils included a driller’s nightmare menagerie of…

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