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ATC to begin soil boring testing in Straits of Mackinac for upcoming cable replacement project

Michigan Department of Environment, Great Lakes and Energy, U.S. Army Corp of Engineers issued permit; work will include shoreline and submarine soil borings

PEWAUKEE, Wis. — American Transmission Co. will begin soil boring testing the week of May 13 in preparation for the planned replacement of ATC’s 138,000-volt submarine electric cables crossing the Straits of Mackinac that were damaged last year when an anchor struck them. The soil borings will begin along the Upper and Lower Michigan shorelines, near the McGulpin and Point La Barbe Riser Stations, and will continue along the lakebed of the Straits through June. The Michigan Department of Environment, Great Lakes and Energy and U.S. Army Corp of Engineers in mid-March issued a permit authorizing the work.

“Our goal is to fully assess the soil where we anticipate the new cables will be located, while minimizing shoreline and lakebed disturbance,” said ATC Project Manager Dustin Johanek.

Following the soil boring work, ATC will apply for additional regulatory and environmental permits from the U.S. Army Corp of Engineers and Michigan’s EGLE by the end of 2019. Beginning in the second quarter of 2021, ATC plans to remove the existing submarine cables and replace them with cables containing solid dielectric insulation to re-establish the two, approximately 4-mile, 138-kv circuits in the Straits. The in-service date is anticipated to be December 2021. ATC continues to work with tribal nations, regulators and nearby landowners to gather input on the cable replacement project.

Note to editors: In its December 2018 Transmission Expansion Plan, the Midcontinent Independent System Operator recommended the replacement of ATC’s two electric circuits in the Straits as soon as practical to ensure the continued reliable service to the Upper Peninsula. More information about ATC’s Straits Cable Replacement Project can be found on the project page. Details regarding the April 2018 anchor strike to ATC’s cables and the subsequent restoration can be found here.

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American Transmission Co. is a Wisconsin-based company that owns and operates the electric transmission system in portions of the Upper Midwest. Formed in 2001 as the nation’s first multi-state transmission-only utility, ATC has invested to improve the adequacy and reliability of its infrastructure. ATC now has $5 billion in assets, including more than 9,890 miles of transmission lines and 568 substations. The company is a member of the MISO regional transmission organization, and provides nondiscriminatory service to all customers, supporting effective competition in energy markets without favoring any market participant. For more information, visit our website at www.atcllc.com.

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