Boscobel to Lone Rock line in Wisconsin remains on schedule for December 2019 in-service date

The Boscobel to Lone Rock (Line Y124) Rebuild Project continues to be on schedule for a December 2019 in-service date, American Transmission Company (ATC) told Wisconsin regulators in an April 24 quarterly progress report for the period Jan. 1 through March 31.

Permit applications are being prepared by the project team for erosion control (Wisconsin Department of Natural Resources, or WDNR); railroad crossings (TRANS 29/Wisconsin Department of Transportation, or WisDOT); and construction in public right of way, or ROW, (WisDOT and counties), the company said.

Detailed transmission line design activities continue, ATC said, adding that the first phase of vegetation management is complete and that the remaining vegetation management will be completed in the fall.

Detailed substation design activities continue as well, the company said.

Actual project costs as of March 31 were about $5.6m, out of the approved approximately $32.4m, ATC said.

As TransmissionHub reported, the commission on Sept. 11, 2017, told ATC that the company’s request for an extension of time to begin construction on the Boscobel to Lone Rock project is granted.

“Order Condition 17 of the above-stated final decision is revised to require starting date for the subject project by June 1, 2018,” the commission said. “All other conditions of the commission’s September 17, 2016, final decision remain unchanged.”

ATC, in an Aug. 30, 2017, filing made with the commission, requested an extension until June 2018 to begin construction on the project.

As noted in that filing, the commission granted to ATC a certificate of authority, effective Sept. 17, 2016, to rebuild its 69-kV transmission line between the Boscobel and Lone Rock substations. Condition 17 of the order granting the certificate requires ATC to request an extension and receive approval if construction will not begin within one year of the effective date of the order, the company noted.

ATC said that as described in its application and the commission’s order, the company intended to begin construction in June by starting ROW clearing activities. The company added in its filing that it intended to begin construction in late 2017, or early 2018 with ROW clearing.

The requested extension would allow additional time for permitting and easement acquisition, and would better align ROW clearing activities with Order Condition 12, which requires the company to consider modifying its schedule to perform vegetation management activities during winter months when vegetation is dormant, to mitigate impacts.

The company added that the requested extension would not impact the approved project cost or change the planned December 2019 in-service date.

The commission, in its September 2016 final decision, granted, subject to conditions, ATC’s application for authority to rebuild about 25 miles of the existing 69-kV transmission line between the existing Boscobel substation in the city of Boscobel, Grant County, and the Lone Rock substation in the town of Buena Vista, Richland County.

Other than rerouting the line in two segments for a total distance of about nine miles, the existing line will be rebuilt within its existing ROW, the commission said in its decision.

The operating voltage of the line will remain at 69 kV, the commission said. ATC proposes to rebuild about 25 miles of the existing 27.6-mile line, the commission said, adding that the company and its predecessor transmission owner have performed maintenance rebuilding on the remaining 2.6 miles of the line during the past 20 to 30 years. On that section of the line, ATC proposes to selectively replace additional facilities following regular maintenance inspections, the commission said.

About Corina Rivera-Linares 3238 Articles
Corina Rivera-Linares, chief editor for TransmissionHub, has covered the U.S. power industry for the past 15 years. Before joining TransmissionHub, Corina covered renewable energy and environmental issues, as well as transmission, generation, regulation, legislation and ISO/RTO matters at SNL Financial. She has also covered such topics as health, politics, and education for weekly newspapers and national magazines. She can be reached at