Seminole Mill
Natural gas power plant in Duval County, Florida. 30 MW of nameplate capacity across 1 generator, operated by WestRock Seminole.
Also known as Seminole Mill Plant · EIA plant 50803
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Key facts
- Capacity
- 30 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- February 1957First generator online
- Operator
- WestRock SeminoleEIA operator ID 27718
- Grid
- JEABalancing authority JEA
- Price nodes
- None linkedNo verified ISO node
- Location
- Duval County, FL30.4178, −81.5978
- EIA plant ID
- 50803EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Seminole Mill produces
Free · EIA-923Net generation, 2025
150 GWh
150,119 MWh, final
Capacity factor, 2025
57.1%
2024: 52.6%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
85.8–157.9
GWh a year. Low 2015, high 2020
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 97,287 | Not reported | 12 of 12 |
| 2002 | 108,606 | Not reported | 12 of 12 |
| 2003 | 0 | Not reported | 12 of 12 |
| 2004 | 101,160 | Not reported | 12 of 12 |
| 2005 | 95,347 | Not reported | 12 of 12 |
| 2006 | 116,668 | Not reported | 12 of 12 |
| 2007 | 119,981 | Not reported | 12 of 12 |
| 2008 | 114,262 | Not reported | 12 of 12 |
| 2009 | 55,567 | Not reported | 12 of 12 |
| 2010 | 112,360 | 42.8% | 12 of 12 |
| 2011 | 122,246 | 46.5% | 12 of 12 |
| 2012 | 127,989 | 48.6% | 12 of 12 |
| 2013 | 103,421 | 39.4% | 12 of 12 |
| 2014 | 77,402 | 29.5% | 12 of 12 |
| 2015 | 85,802 | 32.6% | 12 of 12 |
| 2016 | 123,458 | 46.8% | 12 of 12 |
| 2017 | 96,602 | 36.8% | 12 of 12 |
| 2018 | 120,298 | 45.8% | 12 of 12 |
| 2019 | 148,690 | 56.6% | 12 of 12 |
| 2020 | 157,934 | 59.9% | 12 of 12 |
| 2021 | 141,894 | 54.0% | 12 of 12 |
| 2022 | 100,025 | 38.1% | 12 of 12 |
| 2023 | 128,869 | 49.0% | 12 of 12 |
| 2024 | 138,720 | 52.6% | 12 of 12 |
| 2025 | 150,119 | 57.1% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GEN3 | Natural Gas Steam Turbine | 30.0 | February 1957 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists WestRock Seminole as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Seminole Mill
How much power does Seminole Mill produce?
Seminole Mill reported 150,119 MWh (150 GWh) of net generation in 2025, a 57.1% capacity factor on 30 MW of nameplate capacity.
Where is Seminole Mill?
Seminole Mill is in Duval County, Florida, at 30.4178, −81.5978. It is in the JEA balancing area (JEA).
Who operates Seminole Mill?
EIA-860M for August 2026 lists WestRock Seminole as the operator (EIA operator ID 27718). The operator is not always the owner.
When did Seminole Mill start operating?
Its first generator began operating in February 1957, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page