Big Stone South to Alexandria 345 kV Transmission Line Project

Project Details

Docket Numbers
Transmission Line project23-160
Project Name
Big Stone South to Alexandria 345 kV Transmission Line Project
Applicant
Otter Tail Power Company and Western Minnesota Municipal Power Agency, through its agent, Missouri River Energy Services (collectively, the Applicants)
Location
Douglas County, Pope County, Stevens County, Swift County, Big Stone County
Description

The Applicants propose to construct over 90 miles of new transmission line from Big Stone South, South Dakota to Alexandria, Minnesota along portions of Big Stone, Swift, Stevens, Pope, and Douglas Counties. New transmission lines will be required to connect the existing substations in Big Stone South and Alexandria. Both of the existing substations would also require minor expansions. A new fiber optic Regeneration Station would also be needed within the central segment of the project on 0.23 acres of land.
 

Status
active

Project Contact

Contact
Jenna Ness
Phone
651-539-1061

Project Summary

The Applicants propose to construct over 90 miles of new transmission line from Big Stone South, South Dakota to Alexandria, Minnesota along portions of Big Stone, Swift, Stevens, Pope, and Douglas Counties. The project is needed to provide additional transmission capacity, mitigate current capacity issues, and improve electric system reliability.

The Big Stone South to Alexandria project is the West segment of the larger Big Stone South – Alexandria – Big Oaks 345 kV transmission line project which has obtained a certificate of need (CN-22-538) as a whole. This project comprises the West segment from Big Stone South to Alexandria which filed for a separate route permit application than the East Alexandria to Big Oaks segment, which has already recieved a route permit.

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Key Project Documents

Date
Title
Description
01/06/2026
Final Environmental Impact Statement - Main Text
10/22/2024
On October 22, 2024, the applicants filed a route permit application for the Big Stone South to Alexandria 345-kV Transmission Project.
09/29/2023
On September 29, 2023, the applicants filed a certificate of need application for the entire project (Big Stone South to Alexandria)

Docket Documents

View All Project Documents 

Date Document ID On Behalf Of Description
September 30, 2026 20263-229648-02 Shaddix & Associates - Stenographic Court Reporters Public Hearings Sign-In Sheets
April 28, 2026 20264-231088-01 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma - Map A Revised Decision Option 7A - Big Stone Subregion
April 28, 2026 20264-231088-07 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma's Map D Revised Decision Option 7D - Cyrus Subregion
April 28, 2026 20264-231088-04 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma's Map A-3 Revised Decision Option 7A - Big Stone Subregion East
April 28, 2026 20264-231088-05 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma's Map B Revised Decision Option 7B - Swift Subregion
April 28, 2026 20264-231088-03 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma's Map A-2 Revised Decision Option 7A - Big Stone Subregion Central
April 28, 2026 20264-231088-02 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma - Map A-1 Revised Decision Option 7A - Big Stone Subregion West
April 28, 2026 20264-231088-10 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma's Map G Revised Decision Option 7G - Alexandria Subregion
April 28, 2026 20264-231088-09 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma's Map F Revised Decision Option 7F - Alexandria Subregion Lowry
April 28, 2026 20264-231088-08 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma's Map E Revised Decision Option 7E - White Bear Lake Subregion
April 28, 2026 20264-231088-06 PUC April 30, 2026 Agenda, Decision Options, Commissioner Tuma's Map BSSR10 Option
April 28, 2026 20264-231066-01 PUC Marlowe Klepel
April 28, 2026 20264-231059-01 PUC Marlowe Klepel
April 27, 2026 20264-230994-01 PUC Marlowe Klepel
April 24, 2026 20264-230942-01 Otter Tail Power Company and Western Minnesota Municipal Power Agency Response_COS-SL
April 23, 2026 20264-230833-01 PUC Donald E Stock
April 23, 2026 20264-230819-01 PUC April 30, 2026 Agenda, New Revised Decision Options - Commissioner Tuma
April 17, 2026 20264-230588-01 Otter Tail Power Company and Western Minnesota Municipal Power Agency Responses to Information Requests Filing Letter and COS
April 17, 2026 20264-230588-02 Otter Tail Power Company and Western Minnesota Municipal Power Agency Responses to Information Requests MN-PUC-04.01 to MN-PUC-04.06
April 17, 2026 20264-230499-01 PUC April 30, 2026 Agenda
April 16, 2026 20264-230524-01 PUC Sara Huizenga
April 15, 2026 20264-230454-01 PUC April 30, 2026 Agenda
April 3, 2026 20264-230003-01 PUC PUC 1-8 Otter Tail Power Company and Western Minnesota Municipal Power Agency QUESTION
March 5, 2026 20263-228965-01 Otter Tail Power Company and Western Minnesota Municipal Power Agency
February 27, 2026 20262-228744-01 PUC EIP EIP Staff Exceptions to the ALJ Report
February 23, 2026 20262-228460-01 Otter Tail Power Company and Western Minnesota Municipal Power Agency Affidavits of Publication and Tear Sheets
February 23, 2026 20262-228460-02 Otter Tail Power Company and Western Minnesota Municipal Power Agency Certificate of Service and Service List
February 18, 2026 20262-228272-01 CAH Findings of Fact, Conclusions of Law, and Recommendations
February 2, 2026 20262-227783-01 PUC Received Outside Comment Period- Marlin Zahn
January 20, 2026 20261-227107-01 PUC Received Outside Comment Period - John Beyer