American Transmission Company (ATC), in separate April 29 filings, told the Public Service Commission of Wisconsin that the Caldron Falls-Goodman (J-88) and the Spring Valley-N. Lake Geneva projects remain on schedule.
In its quarterly progress report for the period Jan. 1 through March 31, ATC said that the Caldron Falls-Goodman project’s planned in-service date is June 2020, and that construction began in December 2018 with clearing of the right of way (ROW).
Detailed design engineering and material procurement continued in support of transmission line and substation work, the company said.
Actual project costs as of March 31 totaled about $4.7m, ATC said, adding that the commission-authorized total project cost is about $28.2m, and that the revised project cost estimate as of Dec. 31, 2018, is about $25.2m.
As noted on the project’s webpage, the project involves rebuilding a 21-mile, 69-kV transmission line in Marinette County between the Caldron Falls Hydro substation on Boat Landing 8 Road and the Goodman substation on 614 Woods Lake Road. The line is in an aged condition and reaching the end of its asset life, the site noted. The project will involve removing the existing line and building a new line in the same corridor, but generally offset about 38 feet from the current line, according to the site, which also noted that the offset is necessary because the existing line cannot be taken out of service for an extended period.
Additional work will be required at the Caldron Falls and Goodman substations, as well as at the Fox Hills switching station, the site said.
In a separate quarterly progress report for the same time period, ATC said that the Spring Valley-N. Lake Geneva Project’s anticipated in-service date is Dec. 31.
Discussing the transmission lines portion of the project, ATC said:
- Detailed design activities have been completed for Lines X105 and 63141
- Construction has started on Line X105; hauling, framing, and setting of structures continue
- Construction has been completed on Line X104; restoration activities continue
- ROW clearing activities for Line Y102 have been completed and construction has started; hauling, framing, and setting of structures continue
Discussing the substations portion of the project, ATC said that engineering has been completed at the Spring Valley and Bain substations, with most materials delivered. In addition, construction is complete on the North Lake Geneva and Balsam substations, the company said.
Actual expenditures as of March 31 were about $52.5m, ATC said, adding that the commission-authorized total gross project cost is about $70.6m, and that the revised project cost estimate as of Dec. 31, 2018 totals about $72.3m.
As noted on the company’s website, the commission in March 2016 approved the project, which involves:
- Construction of a new, approximately 23-mile, 138-kV transmission line that stretches from the existing North Lake Geneva substation in southern Walworth County to the existing Spring Valley substation in western Kenosha County
- Construction of the new 138-kV and 69-kV Balsam substation on an ATC-owned parcel along Hwy. 50 in the Town of Wheatland
- Construction of a new 69-kV transmission line to connect the new substation to the existing Twin Lakes substation in Twin Lakes
Studies indicate that the project will deliver benefits to the area by strengthening the electric system to meet the growing use of electricity, the company said, adding that the area electric transmission system is vulnerable to low voltages and power outages and will no longer adequately support the lower-voltage distribution system. The project will provide system redundancy and allow for maintenance outages when repairs are needed, the company said.