Mosaic New Wales Operations
Polk County, Florida · EIA plant ID 10434 · Operator: Mosaic Fertilizer LLC
Nameplate136MWSummer 112 MW
Generators4in service
Net generation345GWh12 mo to Aug 2026
Capacity factor35%other units, summer MW
Heat rate—Btu/kWhfossil units, electric fuel, HHV
First online1981
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 | 332.9 | 67.7% | 13,142 |
| 2002 | 311.1 | 63.4% | — |
| 2004 | 336.3 | 68.4% | — |
| 2005 | 410.7 | 58.1% | — |
| 2006 | 436.5 | 89.0% | — |
| 2007 | 440.6 | 89.8% | — |
| 2008 | 430.5 | 55.7% | — |
| 2009 | 502.3 | 65.2% | — |
| 2010 | 545.7 | 70.8% | — |
| 2011 | 507.8 | 65.9% | — |
| 2012 | 405.9 | 52.5% | — |
| 2013 | 443.5 | 57.5% | — |
| 2014 | 522.6 | 57.3% | — |
| 2015 | 555.4 | 56.6% | — |
| 2016 | 605.3 | 61.5% | — |
| 2017 | 564.2 | 57.5% | — |
| 2018 | 522 | 53.2% | — |
| 2019 | 469.5 | 47.9% | — |
| 2020 | 424.8 | 43.2% | — |
| 2021 | 376.8 | 38.4% | — |
| 2022 | 349.3 | 35.6% | — |
| 2023 | 391.9 | 39.9% | — |
| 2024 | 396.2 | 40.3% | — |
| 2025 | 365.7 | 37.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| TG1 | All Other | ST | 10 | 8 | Aug 1981 | Operating (Out of service) | — | coming soon |
| TG2 | All Other | ST | 58.5 | 48 | Dec 1984 | Operating | — | coming soon |
| TG3 | All Other | ST | 32 | 32 | Dec 1982 | Operating | — | coming soon |
| TG4 | All Other | ST | 35 | 24 | May 2014 | Operating | — | coming soon |
Owner / operator
Operator: Mosaic Fertilizer LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Mosaic Fertilizer LLC | 100.0% | 136 MW |
Nearby plants
Within 80 km.
| Mattaniah Solar | — | 6.6 km |
| Bonnie Mine Solar | 38 MW | 8.9 km |
| Durrance | 60 MW | 9.3 km |
| Magnolia Solar | 75 MW | 9.4 km |
| Jamison Solar (FL) | 75 MW | 9.9 km |
| Laurel Oaks Solar | 61 MW | 10.5 km |