# Grant County

MISO asset profile · https://askthegrid.com/assets/facilities/grant-county

Wisconsin Power & Light Co. - Grant County - MISO

Grant County is a 200 MW solar photovoltaic facility in the Town of Potosi, Grant County, Wisconsin, using single-axis tracking on approximately 1,400 acres. A co-located 100 MW / 400 MWh lithium-ion battery energy storage system entered operation in October 2025. Wisconsin Power & Light Co. owns and operates the combined solar-plus-storage asset within the Alliant Energy system, serving the MISO market.

## Metrics

- **Nameplate capacity:** 300 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 65007 — plant-65007

## Facts

- **Technology:** Batteries, Solar Photovoltaic
- **Operator:** Wisconsin Power & Light Co.

## Related parties

- **Parent company:** Alliant Energy Corporation — Parent company ([source](https://www.alliantenergy.com/))
- **Former owner / construction contractor:** NextEra Energy Resources, LLC (subsidiary) — Predecessor developer and solar EPC contractor ([source](https://www.nexteraenergyresources.com/))
- **Regulator:** Public Service Commission of Wisconsin — Regulatory authority ([source](https://psc.wi.gov/))

## Sources

- [cleantechnica.com](https://cleantechnica.com/2024/06/03/200-mw-solar-power-project-completed-in-wisconsin-energy-storage-to-follow/) — cleantechnica.com · public_source — Source retained for exact-record publication review.
- [alliantenergy.com](https://www.alliantenergy.com/news/archive-news-releases/assets/newsrelease052620) — alliantenergy.com · public_source — Source retained for exact-record publication review.
- [alliantenergy.com](https://www.alliantenergy.com/news/news-center/2021/08/10-grantcountysolar) — alliantenergy.com · public_source — Source retained for exact-record publication review.
- [alliantenergy.com](https://www.alliantenergy.com/news/news-center/2023/08/080923-batteryapproval) — alliantenergy.com · public_source — Source retained for exact-record publication review.
- [alliantenergy.com](https://www.alliantenergy.com/news/news-center/2024/05/053024-grantcosolar) — alliantenergy.com · public_source — Source retained for exact-record publication review.
- [alliantenergy.com](https://www.alliantenergy.com/news/news-center/2025/10/101525-bess-grantcountywi) — alliantenergy.com · public_source — Source retained for exact-record publication review.
- [alliantenergy.com](https://www.alliantenergy.com/our-energy/solar/wisconsin-solar/grant-county-solar-project) — alliantenergy.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/grant-county
Website: [Wisconsin Power & Light Co.](https://www.alliantenergy.com/)

Source: Ask the Grid — https://askthegrid.com/