Solar BESS Hybrid
Cobb County, Georgia · EIA plant ID 63535 · Operator: Cobb Electric Membership Corporation
6 MW under construction (Natural Gas Fired Combustion Turbine), first expected May 2027 · EIA-860M
Nameplate4MWSummer 3 MW
Generators3in service · 6 MW building
Net generation2GWh12 mo to Dec 2025
Capacity factor18%solar units, summer MW
Heat rate11,103Btu/kWhfossil units, electric fuel, HHV
First online2020
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), solar units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2020 | 0.7 | 28.9% | — |
| 2021 | 2.2 | 24.2% | — |
| 2022 | 2.3 | 25.7% | — |
| 2023 | 2.3 | 19.3% | 14,500 |
| 2024 | 2.3 | 18.2% | 11,228 |
| 2025 | 2.2 | 17.6% | 11,103 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| NG | Natural Gas Fired Combustion Turbine | GT | 1 | 1 | Sep 2022 | Operating | — | coming soon |
| SOLAR | Solar Photovoltaic | PV | 1.5 | 1.4 | Oct 2020 | Operating | — | coming soon |
| TEST | Batteries | BA | 1 | 1 | Oct 2020 | Operating | — | coming soon |
| GEN02 | Natural Gas Fired Combustion Turbine | GT | 2 | 2 | planned May 2027 | Under construction | — | coming soon |
| GEN03 | Natural Gas Fired Combustion Turbine | GT | 2 | 2 | planned May 2027 | Under construction | — | coming soon |
| GEN04 | Natural Gas Fired Combustion Turbine | GT | 2 | 2 | planned May 2027 | Under construction | — | coming soon |
Owner / operator
Operator: Cobb Electric Membership Corporation. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Gas South | 71.4% | 3 MW |
| Cobb Electric Membership Corporation | 28.6% | 1 MW |
Nearby plants
Within 80 km.
| Riverwood 100 Building | 1 MW | 14.4 km |
| Morgan Falls | 17 MW | 16 km |
| Jack McDonough | 2,848 MW | 18.8 km |
| Allatoona Substation #10 | 10 MW | 19.2 km |
| Shepherd Center | 6 MW | 24 km |
| Allatoona | 87 MW | 25.9 km |