SEGS VIII
San Bernardino County, California · EIA plant ID 10444 · Operator: Terra-Gen Operating Co-Solar
×92 MW solar retired since 2020 (latest Oct 2021)
Nameplate169MWSummer 154 MW
Generators2in service
Net generation230GWh12 mo to Aug 2026
Capacity factor33%solar units, summer MW
Heat rate—Btu/kWhfossil units, electric fuel, HHV
First online2023
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), solar 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 | 178.1 | 17.0% | — |
| 2002 | 177.7 | 17.3% | — |
| 2003 | 165.8 | 17.0% | 13,728 |
| 2004 | 155.4 | 17.7% | 13,636 |
| 2005 | 138.7 | 15.6% | 13,631 |
| 2006 | 141.5 | 15.2% | 14,143 |
| 2007 | 146.5 | 15.9% | 14,671 |
| 2008 | 151.9 | 17.5% | 14,880 |
| 2009 | 187 | 17.1% | 14,305 |
| 2010 | 219.7 | 20.2% | 13,834 |
| 2011 | 214 | 19.8% | 13,873 |
| 2012 | 202.1 | 18.8% | 13,729 |
| 2013 | 158 | 18.3% | 13,427 |
| 2014 | 159 | 18.9% | 13,345 |
| 2015 | 157.2 | 17.9% | 14,056 |
| 2016 | 156.3 | 18.2% | 14,074 |
| 2017 | 143.8 | 16.0% | 14,491 |
| 2018 | 148.3 | 17.2% | 14,053 |
| 2019 | 137.5 | 15.6% | 13,840 |
| 2020 | 114.9 | 14.8% | 16,629 |
| 2021 | 81.7 | 15.6% | — |
| 2023 | 100.8 | 26.9% | — |
| 2024 | 224.5 | 30.1% | — |
| 2025 | 240.3 | 32.7% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| LHC1 | Batteries | BA | 69 | 69 | Nov 2025 | Operating | — | coming soon |
| LOC1 | Solar Photovoltaic | PV | 100.4 | 85 | Jul 2023 | Operating | — | coming soon |
| GEN1 | Solar Thermal without Energy Storage | ST | 92 | 80 | Dec 1989 | Retired Oct 2021 | — | coming soon |
Owner / operator
Operator: Terra-Gen Operating Co-Solar. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Terra-Gen Operating Co-Solar | 100.0% | 169 MW |
Nearby plants
Within 80 km.
| Lockhart ESS, LLC | 45 MW | 0.2 km |
| Desert Breeze Solar, LLC | 125 MW | 1.1 km |
| Lockhart Solar PV II | 144 MW | 1.6 km |
| Overnight Solar | — | 1.6 km |
| Lockhart Solar PV IV, LLC | 80 MW | 1.7 km |
| SEGS IX | retired | 1.7 km |