Located in Olmsted County between Byron and Rochester, the facility will store excess electricity from the grid for up to four hours and discharge it during times of high demand. The Snowshoe Energy Storage Project will help smooth fluctuations in energy supply and support the integration of more renewable energy into Minnesota’s power system, enhancing both grid reliability and sustainability. The facility is expected to be in service by late 2027. 

In response to stakeholder feedback the Commission added requirements to strengthen local safety and preparedness. The modified plan requires the permittee to work with local governments and emergency responders on a detailed water main extension report, develop a plan to acquire specialized emergency equipment, and provide related training for first responders, all at the permittee’s expense. 

"This project represents a crucial evolution in our state's energy infrastructure," said Commissioner John Tuma. “By collaborating with the developer and local communities, we’ve approved a needed energy solution while ensuring safety and emergency preparedness remain a top priority. This proactive approach will be essential as we integrate new technologies to meet our energy goals.” 

Project details 

The Snowshoe Energy Storage Project will connect to the adjacent SMMPA-Maple Leaf substation and use advanced battery, inverter, and control technologies to help maintain voltage and frequency on the transmission system. By providing fast-response balancing services, the facility will help keep the grid stable during sudden shifts in generation or demand. Space for future battery upgrades is included to maintain capacity over time. The project’s interconnection request is in the MISO Definitive Planning Phase, with a Generation Interconnection Agreement expected in early 2026. 

Additional project details are available on the PUC’s website.