Garrison Energy Center LLC
Kent County, Delaware · EIA plant ID 57349 · Operator: Garrison Energy Center LLC
Nameplate361MWSummer 309 MW
Generators2in service
Net generation1,000GWh12 mo to Aug 2026
Capacity factor37%gas/coal/oil units, summer MW
Heat rate7,358Btu/kWhfossil units, electric fuel, HHV
First online2015Runs as intermediate
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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), gas/coal/oil 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) |
|---|---|---|---|
| 2015 | 504.5 | 31.1% | 7,095 |
| 2016 | 1,565.1 | 56.4% | 6,984 |
| 2017 | 1,769.2 | 63.9% | 7,013 |
| 2018 | 1,335.4 | 48.2% | 7,148 |
| 2019 | 1,723.7 | 63.7% | 7,131 |
| 2020 | 1,579.7 | 58.2% | 7,084 |
| 2021 | 1,103.6 | 40.8% | 7,155 |
| 2022 | 1,257.3 | 46.5% | 7,156 |
| 2023 | 816.6 | 30.2% | 7,325 |
| 2024 | 794.6 | 29.3% | 7,391 |
| 2025 | 855.5 | 31.6% | 7,305 |
Fuel capability
Gas-fired turbines (CT/GT/CA/CS) that can also burn liquid fuel. EIA-860 Schedule 3 for capability, EIA-923 for actual burn.
StatusLikely still dual fuel
Liquid fuel burned · 36 mo232,770 MMBtu
Last month with liquid burnJan 2026
Switch while operatingYes
Net summer MW on gas309
Net summer MW on oil280
Time gas → oilup to 1 h (EIA 1H)
Time oil → gasup to 6 h (EIA 6H)
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 |
|---|---|---|---|---|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | CT | 235 | 186 | Jun 2015 | Operating | — | coming soon |
| STG2 | Natural Gas Fired Combined Cycle | CA | 126 | 123 | Jun 2015 | Operating | — | coming soon |
| UNIT1 | — | — | — | — | — | not_current | — | coming soon |
| UNIT2 | Natural Gas Fired Combined Cycle | CC | 309 | 309 | planned Jun 2016 | not_current | — | coming soon |
Owner / operator
Operator: Garrison Energy Center LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Cobalt Power, L.L.C. | 100.0% | 361 MW |
Nearby plants
Within 80 km.
| Dover Sun Park | 10 MW | 0.6 km |
| McKee Run | retired | 4.2 km |
| NRG Energy Center Dover | 118 MW | 5.9 km |
| Van Sant Station | 45 MW | 6.3 km |
| KE73 | 4 MW | 7.6 km |
| Sunrise Magnolia DE | — | 12.9 km |