Plymouth-Area Power Grid Upgrades

Project Update

Construction has kicked off on the new Pomerleau Lake Substation in Plymouth north of Schmidt Lake Road, just west of I-494.

In addition to constructing the new substation, the Plymouth-area power grid upgrades include reenergizing the existing 3.4-mile 69 kV line between the new Pomerleau Lake Substation and Hollydale Substation (see map). Re-energizing the line will utilize the existing structures and infrastructure and require vegetation management. Xcel Energy representatives are performing line inspections in January 2018 and will begin vegetation management, including tree trimming, between January and March 2018. View landowner notification letters.

Xcel Energy is in the process of purchasing the 69 kV transmission line from Great River Energy. Xcel Energy anticipates taking ownership of the transmission line by mid-2018 and re-energizing the line by late 2018. In taking ownership of the 69 kV line and easements, we have agreed to restrict the operating voltage of the existing Hollydale to Pomerleau Lake line route to 69 kV.

Construction timeline (subject to change)

  • Summer 2017: Construction begins on Pomerlau Lake Substation
  • Jan-March 2018: 69 kV line inspection and tree trimming
  • Spring 2018: Start construction of a half-mile of new 69 kV line to connect existing Hollydale 69 kV line to Pomerleau Lake Substation
  • December 2018: Estimated in-service date for Pomerlau Lake Substation and re-energization of 69 kV line between Hollydale and Pomerleau Lake (including a half-mile of new 69 kV line)
  • 2019-2020: Construction of Hollydale Substation upgrades and associated distribution feeders

Project History

We have been working with the community to develop a solution to address electric deficiencies in the Plymouth area for more than seven years. After we withdrew our Hollydale 115 kilovolt (kV) transmission line proposal in 2013, we began working to develop new alternatives to ensure the community has reliable electric service. While the population in the city of Plymouth has quadrupled over the last 40 years, the four primary electric substations, as well as the majority of distribution and transmission lines serving the Plymouth area are between 25 and 60 years old.

Three different electric solutions were developed with careful consideration of public input along with a focus on minimizing impacts to the community. We presented these three alternatives (A, B, and C) at two public meetings in May, 2016. The three power grid alternatives would improve reliability by reducing outages caused by overloaded equipment, and by decreasing the amount of time necessary to recover from an outage. Following these public meetings, we carefully reviewed all input, revised alternatives where possible, and compared the three alternatives using both public input and a data-based comparison.

View detailed decision document

Modified Alternative C selected

We are constructing a modified version of Alternative C (view map). This alternative relies on existing infrastructure, requiring less construction of new facilities and minimizing human and environmental impacts. In addition, Alternative C provides the best electrical performance of the three alternatives and is the best long-term solution for the area's electrical needs.

Public Comments – We have received a significant number of public comments, and view this as a good outcome of our public outreach. View comments received below. In an effort to protect commenter’s privacy, names and contact information are redacted.

Comments part one (PDF)
Comments part two (PDF)
Comments part three (PDF)

Comments containing questions – Please view the Frequently Asked Questions (PDF updated 11/23/16) for answers to questions we have received in the comments.

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Email or call 612-330-6644

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