Walnut Grove Demonstration Plant
Walnut Grove Demonstration Plant is a 3 MW battery storage project in Leake County, Mississippi, operated by Mississippi Power Co. EIA-860M lists 2 generating units here. Its units entered service in 2023.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 3 MW
- 3 MW net summer
- Generating units
- 2
- In service
- 2023
- EIA plant ID
- 65697
Where it is
Loading map…
- County
- Leake County, Mississippi
- Coordinates
- 32.5798, -89.4542
- Balancing authority
- SOCO
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- Mississippi Power Co
- Primary energy source
- Battery
- Technologies
- Batteries, Solar Photovoltaic
- Status
- Operating
This site runs on more than one energy source. EIA-860M capacity splits: Battery 2 MW, Solar 2 MW. It is filed here under Battery, the source with the most capacity.
Walnut Grove Demonstration Plant: FAQ
- Where is Walnut Grove Demonstration Plant?
- In Leake County, Mississippi (MS). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Walnut Grove Demonstration Plant?
- 3 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
- Who owns Walnut Grove Demonstration Plant?
- EIA-860M names Mississippi Power Co as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Walnut Grove Demonstration Plant LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Mississippi Power Co here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Walnut Grove Demonstration Plant LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Walnut Grove Demonstration Plant still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.