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SunPrairie Solar Panel Manufacturing Facility

PermittingClean Energy·Lead: MPCA·Marshall, MN
Milestones
8/9
completed
Statutory Deadline
93 days
June 5, 2026
Subd. 6(b): 18-month EAW deadline
Days in Review
489
since CPP request
Timeline Extensions
13%
1 modified milestone

Project Description

New 800,000 sq ft solar panel manufacturing facility with associated chemical storage, cleanroom operations, and wastewater pretreatment. Expected to create 450 permanent jobs. Project supported by federal IRA manufacturing tax credits.

Applicant
SunPrairie Energy Manufacturing LLC
Estimated Cost
$520,000,000
CPP Requested
November 1, 2024
CPP Prepared
December 20, 2024
County
Lyon
Requires EIS
No

Permitting Timetable

Today
EAW Submitted
Nov 24
EAW Deemed Complete
Dec 24
CPP Prepared
Dec 24
EIS Need Decision (No EIS)
Feb 25
Air Permit Application
Apr 25
Air Permit Issued
Sep 25
Wastewater Pretreatment Permit
Nov 25
Hazardous Waste Storage Permit
Jan 26
Highway Access Permit
Mar 26
Complete
On Track
At Risk
Overdue
Upcoming

Participating Agencies(Subd. 5(a)(1))

MPCAMinnesota Pollution Control Agency
Lead agency for environmental review and air/water permitting
DEEDDepartment of Employment and Economic Development
Economic impact review and workforce development coordination
MDHMinnesota Department of Health
Health impact assessment and drinking water protection
MnDOTMinnesota Department of Transportation
Transportation access and road impact analysis

Public Meetings(Subd. 5(a)(2))

EAW CommentJanuary 10, 2025
Marshall Community Center
Public comment meeting for Environmental Assessment Worksheet
PermitAugust 20, 2025
Marshall Community Center
Public hearing on air quality permit

Deadline Modifications(Subd. 7)

Highway Access Permit
Original: January 15, 2026 → Modified: March 15, 2026
Traffic study required additional data collection during winter months

Statutory Notifications

MnDOT highway access permit delayedTriggered

Winter traffic study data collection extended timeline. New target: March 15.

Feb 1, 2026Subd. 7(b)
Air permit issued ahead of scheduleTriggered

Air quality permit issued 3 days before target date.

Sep 15, 2025

Documents

Environmental Assessment Worksheet
MPCA · Nov 1, 2024
Final
Coordinated Project Plan
MPCA · Dec 20, 2024
Final
Negative EIS Declaration
MPCA · Feb 28, 2025
Final
Air Quality Permit
MPCA · Sep 28, 2025
Final
Wastewater Pretreatment Permit
MPCA · Nov 10, 2025
Final
Hazardous Waste Storage Permit
MPCA · Jan 30, 2026
Final
Traffic Impact Study
MnDOT · Feb 15, 2026
Under Review
Highway Access Permit Application
MnDOT · Dec 1, 2025
Under Review

Permitting Milestones

EAW SubmittedComplete
MPCA · Completed Nov 1, 2024
EAW Deemed CompleteComplete
MPCA · Completed Dec 5, 2024
CPP PreparedComplete
MPCA · Completed Dec 20, 2024
EIS Need Decision (No EIS)Complete
MPCA · Completed Feb 28, 2025
Air Permit ApplicationComplete
MPCA · Completed Apr 1, 2025
Air Permit IssuedComplete
MPCA · Completed Sep 28, 2025
Wastewater Pretreatment PermitComplete
MPCA · Completed Nov 10, 2025
Hazardous Waste Storage PermitComplete
MPCA · Completed Jan 30, 2026
Highway Access PermitOn Track
MnDOT · Target: Mar 15, 2026(was Jan 15, 2026)
Traffic study required additional data collection during winter months

Quarterly Updates(Subd. 5(b))

Q4 2024December 31, 2024

CPP prepared ahead of schedule. Strong community support. No EIS expected.

Q1 2025March 31, 2025

Negative declaration on EIS need. Air permit application submitted. DEED economic impact review complete.

Q2 2025June 30, 2025

Air permit review progressing. Wastewater pretreatment design under review.

Q3 2025September 30, 2025

Air permit issued ahead of schedule. Wastewater permit on track.

Q4 2025December 31, 2025

Wastewater pretreatment permit issued. Hazardous waste permit nearing completion.

Q1 2026March 31, 2026

Nearly all permits issued. MnDOT highway access permit delayed for winter traffic study. Facility construction underway.