3 MW Batteries (2 MW) + Solar Photovoltaic (2 MW) operating in Leake, MS — Southern Company Services, Inc. - Trans
3 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2023
Operating Since
Coordinates
32.5955, -89.4540
County
Leake, MS
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Mississippi Power Co | Mississippi Power | — |
| Owner(s) | Mississippi Power Co | Southern | — |
| Status | Operating | operating | — |
The Walnut Grove Demonstration Plant is a 3 MW hybrid power plant located in Leake County, Mississippi. It began operating in 2023 and is owned by Southern Company and operated by Mississippi Power Co. The plant utilizes both solar photovoltaic and battery storage technologies, with two generators on site. The primary fuel source is listed as MWH, indicating the plant draws power from the grid to charge its batteries in addition to solar generation. The battery energy storage system (BESS) has a capacity of 1.5 MWh and a duration of 1 hour, utilizing lithium-ion battery chemistry. The solar array uses single-axis tracking.
The plant's latest annual generation was 3,572 MWh, resulting in a capacity factor of 13.5%. Walnut Grove Demonstration Plant is ranked 4th out of 4 power plants in Mississippi and 1066th out of 1205 plants nationally. The plant operates within the Southern Company Services, Inc. - Trans balancing authority and the SERC NERC region.
Generated from EIA, GEM, and public data sources
NERC Region
SERC
Balancing Authority
Southern Company Services, Inc. - Trans
Grid Voltage
12.5 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
167 MWh
Net Discharge
3.6K MWh
Annual Net Energy
13.5%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
No financial data available for this plant.
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
U.S.-Japan investment framework takes shape around massive natural gas power projects
A 9.2 GW project in southern Ohio and up to 10 GW of NextEra hubs in Texas and Pennsylvania mark the first concrete steps under Japan's $550 billion U.S. commitment
U.S.-Japan investment framework takes shape around massive natural gas power projects
A 9.2 GW project in southern Ohio and up to 10 GW of NextEra hubs in Texas and Pennsylvania mark the first concrete steps under Japan's $550 billion U.S. commitment
U.S.-Japan investment framework takes shape around massive natural gas power projects
A 9.2 GW project in southern Ohio and up to 10 GW of NextEra hubs in Texas and Pennsylvania mark the first concrete steps under Japan's $550 billion U.S. commitment
U.S.-Japan investment framework takes shape around massive natural gas power projects
A 9.2 GW project in southern Ohio and up to 10 GW of NextEra hubs in Texas and Pennsylvania mark the first concrete steps under Japan's $550 billion U.S. commitment
Last updated 2026-03-25
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