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Construction on St. Martins-Edgewood-Mukwonago Rebuild Project to be completed by June 2019

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American Transmission Company (ATC) on April 27 told the Public Service Commission of Wisconsin that construction on the St. Martins-Edgewood-Mukwonago Rebuild Project is scheduled to begin in 2018, and be completed by June 2019.

As TransmissionHub reported, the commission in October 2015 approved the rebuild of the line in southeastern Wisconsin where the lattice structures are almost 90 years old and at the end of their useful life.

ATC’s request for a one-year extension to begin construction on rebuilding existing 138-kV electric transmission line and substation facilities between the existing St. Martins and Edgewood substations, and between the Edgewood and Mukwonago substations, was granted last year.   

According to a Nov. 15, 2016, filing by the state Division of Energy Regulation, the commission in October 2015 approved ATC’s application for authority to rebuild the existing 138-kV lines. Order Condition 15 in the final decision stated that “if ATC does not begin on-site physical construction within one year of the effective date of this certificate of authority and order, the certificate authorizing the approved project shall become void unless ATC: files a written request for an extension of time with the commission before the date on which the certificate becomes void, and is granted an extension by the commission.”

ATC in August 2016 filed a written request for extension to begin construction for the approved project, the division said, adding that the company’s stated reasons for its request were “resource constraints, primarily the availability of construction labor.”

ATC requested an extension of one year, until September 2018, in order to begin construction, the division said.

In its April 27 quarterly progress report for the period Jan. 1 through March 31, the company said that detailed design continues on the transmission lines. Steel pole loading drawings and exhibits were issued for bids; steel pole bids were received and reviewed; transmission line construction specifications were issued for comment; and constructability “walkdowns” with vibratory caisson and overhead construction contractors were performed, ATC said.

The company noted that detailed design continues on the St. Martins substation, adding that detailed electrical and physical design packages were issued for comment; on-site constructability reviews were performed; and preparation of relay panel and equipment wiring drawings began.

ATC said that the approved total project costs are about $24.7m, and that the total project costs through March 31 were about $1.96m.

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