Seminole Mill
Duval County, Florida · EIA plant ID 50803 · Operator: RockTenn-Seminole
Nameplate30MWSummer 20 MW
Generators1in service
Net generation150GWh12 mo to Dec 2025
Capacity factor86%gas/coal/oil units, summer MW
Heat rate4,549Btu/kWhfossil units, electric fuel, HHV
First online1957Runs as baseload
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) |
|---|---|---|---|
| 2001 | 97.3 | — | 8,881 |
| 2002 | 108.6 | 95.4% | — |
| 2003 | 0 | — | — |
| 2004 | 101.2 | 44.4% | 7,551 |
| 2005 | 95.3 | 14.5% | 7,551 |
| 2006 | 116.7 | 22.5% | 7,551 |
| 2007 | 120 | 22.7% | 7,551 |
| 2008 | 114.3 | 100.1% | — |
| 2009 | 55.6 | 48.8% | — |
| 2010 | 112.4 | 98.7% | 4,937 |
| 2011 | 122.2 | 107.3% | — |
| 2012 | 128 | 112.1% | 6,641 |
| 2013 | 103.4 | 90.8% | 7,331 |
| 2014 | 77.4 | 68.0% | 7,324 |
| 2015 | 85.8 | 75.3% | 7,324 |
| 2016 | 123.5 | 108.1% | 4,549 |
| 2017 | 96.6 | 84.8% | 4,549 |
| 2018 | 120.3 | 68.7% | 4,549 |
| 2019 | 148.7 | 84.9% | 4,549 |
| 2020 | 157.9 | 89.9% | 4,549 |
| 2021 | 141.9 | 81.0% | 4,549 |
| 2022 | 100 | 57.1% | 4,549 |
| 2023 | 128.9 | 73.6% | 4,549 |
| 2024 | 138.7 | 79.0% | 4,549 |
| 2025 | 150.1 | 85.7% | 4,549 |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN3 | Natural Gas Steam Turbine | ST | 30 | 20 | Feb 1957 | Operating | — | coming soon |
Owner / operator
Operator: RockTenn-Seminole. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| RockTenn-Seminole | 100.0% | 30 MW |
Nearby plants
Within 80 km.
| Northside Generating Station | 1,407 MW | 4.3 km |
| Jax LNG | 13 MW | 4.7 km |
| Anheuser-Busch Jacksonville | 9 MW | 4.9 km |
| J D Kennedy | 370 MW | 6.5 km |
| Starratt Solar | 5 MW | 8.5 km |
| Imeson Solar | 10 MW | 12 km |