American Transmission Company, in its Oct. 23 quarterly progress report for the period July 1 through Sept. 30 filed with Wisconsin regulators, said that the actual project costs as of Sept. 30 for the Boscobel to Lone Rock (Line Y124) Rebuild Project were about $7.8m out of the approved total project cost of about $32.3m.
As TransmissionHub reported, the Public Service Commission of Wisconsin last September 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.
In its Oct. 23 filing, ATC said that the project is on schedule for substantial completion of the Y-124 rebuild in December 2019.
Muscoda Utilities initiated a project early this year to expand its industrial substation, ATC said, adding that it will delay the rebuild of a 1.7-mile section of Y-124 in the vicinity of the Muscoda Industrial substation to avoid rework and additional construction cost.
The substation expansion remains in the early planning stage, and the transmission line design needed to accommodate that substation expansion is still unclear, ATC said. The gap in the Y-124 transmission line rebuild will be completed with the substation expansion project, which is planned for construction in 2020 or 2021.
Coordination and permitting efforts with Wisconsin Department of Natural Resources (WDNR), U.S. Army Corps of Engineers, and the State Historical Preservation Office are complete, ATC added, noting that the Incidental Take Permit from WDNR was amended in August. All permits have been received from the Wisconsin Department of Transportation, the Utility Permit from the Lower Wisconsin State Riverway Board has been received, and county floodplain permits were issued, ATC said.
The final construction drawings and specifications for the transmission line portion of the project have been issued for construction, the company said, adding that “Phase two” of the vegetation management is in progress and scheduled for completion this fall.
Concrete foundation work south of the Wisconsin River for the transmission line portion began in late August and is scheduled for completion in November, ATC said.
The final construction drawings and specifications for the substation portion of the project have been issued for construction, the company said.