Spearmint Energy Clears Permit for 600 MWh Battery Project in Minnesota
Event summary
- Spearmint Energy secured a site permit for the 150 MW / 600 MWh Midwater Battery Energy Storage System in Freeborn County, Minnesota.
- The project will be built on 10–20 acres adjacent to the Glenworth Substation off Highway 65.
- This is Spearmint’s second permitted battery storage project in Minnesota, following Snowshoe in Olmsted County.
- Spearmint operates 350 MW / 700 MWh in ERCOT and has 300 MW / 600 MWh under construction.
The big picture
This permit approval underscores Minnesota’s growing role as a hub for large-scale battery storage, with Spearmint positioning itself as a key player in the MISO region. The project aligns with broader trends of grid modernization and renewable energy integration, particularly as electricity demand surges. With 350 MW already operational in ERCOT and additional projects under development nationwide, Spearmint is expanding its footprint in critical energy markets.
What we're watching
- Regulatory Momentum
- Whether Spearmint can sustain this permitting pace in other MISO states.
- Grid Integration
- How quickly Midwater connects to the Glenworth Substation and begins commercial operations.
- Competitive Positioning
- Whether this project strengthens Spearmint’s lead in standalone battery storage deployments.
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