Mosaic South Pierce Operations
Polk County, Florida · EIA plant ID 10004 · Operator: Mosaic Fertilizer LLC
×8 MW other retired since 2020 (latest Dec 2025)
Nameplate38MWSummer 33 MW
Generators1in service
Net generation64GWh12 mo to Aug 2026
Capacity factor22%other units, summer MW
Heat rate—thermal plants only
First online1992
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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2002 | 306.8 | 94.7% | — |
| 2004 | 274 | 84.3% | — |
| 2005 | 251 | 77.5% | — |
| 2006 | 203.1 | 62.7% | — |
| 2007 | 138.6 | 42.8% | — |
| 2008 | 135.2 | 41.6% | — |
| 2009 | 42.9 | 13.3% | — |
| 2010 | 78.3 | 24.1% | — |
| 2011 | 158.7 | 49.0% | — |
| 2012 | 161 | 49.5% | — |
| 2013 | 207.9 | 64.2% | — |
| 2014 | 238.3 | 73.5% | — |
| 2015 | 242.4 | 74.8% | — |
| 2016 | 204.8 | 63.0% | — |
| 2017 | 220.9 | 68.2% | — |
| 2018 | 247.5 | 76.4% | — |
| 2019 | 254.5 | 78.5% | — |
| 2020 | 195.9 | 60.3% | — |
| 2021 | 119.3 | 36.8% | — |
| 2022 | 99.9 | 30.8% | — |
| 2023 | 155.8 | 48.1% | — |
| 2024 | 120.4 | 37.0% | — |
| 2025 | 87.5 | 27.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| TG2 | All Other | ST | 38 | 33 | Jan 1992 | Operating | — | coming soon |
| TG1 | All Other | ST | 7.5 | 4 | Jan 1978 | Retired Dec 2025 | — | 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% | 38 MW |
Nearby plants
Within 80 km.
| Brewster Solar | — | 3.4 km |
| Durrance | 60 MW | 4.4 km |
| Jamison Solar (FL) | 75 MW | 4.9 km |
| Polk | 1,458 MW | 6.5 km |
| Hines Energy Complex | 2,266 MW | 7.2 km |
| OE_FL10 | — | 7.6 km |