US Borax
Kern County, California · EIA plant ID 50115 · Operator: U S Borax Inc
Nameplate48MWSummer 39 MW
Generators1in service
Net generation257GWh12 mo to Aug 2026
Capacity factor75%gas/coal/oil units, summer MW
Heat rate5,163Btu/kWhfossil units, electric fuel, HHV
First online1984Runs as baseload
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), 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 | 319.7 | 93.6% | 6,865 |
| 2002 | 314.8 | 92.2% | 6,848 |
| 2003 | 284.9 | 83.4% | 6,686 |
| 2004 | 366.3 | 106.9% | 5,273 |
| 2005 | 272.1 | 79.7% | 5,273 |
| 2006 | 327.5 | 95.9% | 5,273 |
| 2007 | 337.1 | 98.7% | 5,641 |
| 2008 | 334.8 | 97.7% | 5,722 |
| 2009 | 283.8 | 83.1% | 5,700 |
| 2010 | 349.8 | 102.4% | 5,654 |
| 2011 | 338.7 | 99.2% | 5,637 |
| 2012 | 313.5 | 91.5% | 5,603 |
| 2013 | 323.6 | 94.7% | 5,670 |
| 2014 | 332.4 | 97.3% | 5,683 |
| 2015 | 324.3 | 94.9% | 5,668 |
| 2016 | 336.5 | 98.2% | 5,080 |
| 2017 | 301.7 | 88.3% | 4,982 |
| 2018 | 282.3 | 82.6% | 4,966 |
| 2019 | 296.5 | 86.8% | 5,088 |
| 2020 | 315.1 | 92.0% | 5,090 |
| 2021 | 274.1 | 80.2% | 4,858 |
| 2022 | 303.1 | 88.7% | 4,656 |
| 2023 | 318.7 | 93.3% | 4,959 |
| 2024 | 270.9 | 79.1% | 5,112 |
| 2025 | 274.5 | 80.3% | 5,137 |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Natural Gas Fired Combustion Turbine | GT | 48.2 | 39 | Jul 1984 | Operating | — | coming soon |
Owner / operator
Operator: U S Borax Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| U S Borax Inc | 100.0% | 48 MW |
Nearby plants
Within 80 km.
| SEGS VI | retired | 12.4 km |
| SEGS VII | retired | 12.5 km |
| Aratina Solar Center 1A | 195 MW | 12.8 km |
| Aratina Solar Center 1 Hybrid | 130 MW | 12.8 km |
| SEGS V | retired | 13.3 km |
| SEGS IV | retired | 13.4 km |