Project Timeline

Early development efforts began, including finalizing the project footprint and conducting initial viability studies from both a land and interconnection perspective.

Atlantica Sustainable Infrastructure acquired the Osseo Solar project from its previous developer, taking over all development activities.

Atlantica completed Wetland Delineations and began working with Stantec to prepare the Conditional Use Permit. Initial engineering designs commenced in September 2025, and a meeting with Trempealeau County was held in December to discuss the contents of the permit.

Phase 1 Cultural Resource Assessment began in January 2026. In February, the WDNR Environmental Review was completed. Work also began on the Vegetation Management Plan, Landscape Plan, Sound Studies, and Decommissioning Plans.

On May 6th, 2026, Atlantica hosted an Open House at Grand Occasions from 6–8pm. A second Open House for the community of Sumner Township and Osseo is planned for June 2026.

Atlantica plans to submit the Conditional Use Permit to Trempealeau County. This is a key regulatory milestone required before construction can begin.

Estimated date subject to change.

Atlantica begins geotechnical investigations across the project area to assess soil conditions and inform final foundation and racking system design.

Estimated date subject to change.

Atlantica begins 305 engineering design work, finalizing all technical specifications required for construction procurement and permitting compliance.

Estimated date subject to change.

Construction of the Osseo Solar facility begins, including civil works, panel installation, electrical infrastructure, and grid connection activities.

Estimated date subject to change.

The Osseo Solar facility achieves Commercial Operation Date (COD), delivering clean renewable energy to the grid and generating long-term economic benefits for Trempealeau County and surrounding communities.

Estimated date subject to change.