Mosaic Phosphates Uncle Sam
St. James County, Louisiana · EIA plant ID 10198 · Operator: Mosaic Phosphates Co.
Nameplate26MWSummer 26 MW
Generators2in service
Net generation93GWh12 mo to Aug 2026
Capacity factor28%other units, summer MW
Heat rate—Btu/kWhfossil units, electric fuel, HHV
First online1968
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), other 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 | 133.7 | 73.0% | 12,000 |
| 2002 | 191.8 | 107.0% | — |
| 2004 | 166.1 | 92.4% | — |
| 2006 | 108.5 | 60.5% | — |
| 2007 | 148.3 | 83.0% | — |
| 2008 | 122.1 | 68.2% | — |
| 2009 | 110.1 | 61.6% | — |
| 2010 | 150.8 | 84.4% | — |
| 2011 | 105.8 | 59.2% | — |
| 2012 | 0 | 0.0% | — |
| 2013 | 74.9 | 77.8% | — |
| 2014 | 85.6 | 88.8% | — |
| 2015 | 85.7 | 89.0% | — |
| 2016 | 112.1 | 63.3% | — |
| 2017 | 8.2 | 0.9% | — |
| 2018 | -3.9 | -9.0% | — |
| 2019 | -35.8 | -19.6% | — |
| 2020 | -53.4 | -25.2% | — |
| 2021 | -79.9 | -35.1% | — |
| 2022 | -71.2 | -31.2% | — |
| 2023 | -71.7 | -31.5% | — |
| 2024 | -66.8 | -29.2% | — |
| 2025 | 76.9 | 25.4% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN2 | All Other | ST | 11 | 11 | Jan 1968 | Operating | — | coming soon |
| GEN3 | All Other | ST | 15 | 15 | Aug 2016 | Operating | — | coming soon |
| GEN1 | All Other | ST | 11 | 10.2 | Jan 1968 | Retired Nov 2011 | — | coming soon |
Owner / operator
Operator: Mosaic Phosphates Co.. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Mosaic Phosphates Co. | 100.0% | 26 MW |
Nearby plants
Within 80 km.
| St. James Solar (LA) | 20 MW | 11.7 km |
| Vacherie Solar Energy Center, LLC | — | 11.8 km |
| Burnside Alumina Plant | retired | 13.7 km |
| Louisiana Sugar Refining | 7 MW | 14 km |
| Gramercy Holdings LLC | 85 MW | 15.4 km |
| Shell Chemical | 80 MW | 22.3 km |