Griffith Energy LLC
Mohave County, Arizona · EIA plant ID 55124 · Operator: Star West Gen Griffith Energy LLC
Nameplate655MWSummer 570 MW
Generators3in service
Net generation3,856GWh12 mo to Aug 2026
Capacity factor77%gas/coal/oil units, summer MW
Heat rate7,330Btu/kWhfossil units, electric fuel, HHV
First online2002Runs 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) |
|---|---|---|---|
| 2002 | 1,636.2 | — | — |
| 2003 | 1,258.2 | 24.4% | 7,385 |
| 2004 | 1,137.8 | 22.0% | 7,373 |
| 2005 | 786.9 | 15.8% | 7,552 |
| 2006 | 1,403.4 | 28.1% | 7,231 |
| 2007 | 1,967.9 | 39.4% | 7,368 |
| 2008 | 1,609 | 32.1% | 7,387 |
| 2009 | 1,664.4 | 33.3% | 7,355 |
| 2010 | 1,413.7 | 28.3% | 7,369 |
| 2011 | 1,287.2 | 25.8% | 7,350 |
| 2012 | 1,584.1 | 31.6% | 7,330 |
| 2013 | 2,110.8 | 42.3% | 7,322 |
| 2014 | 2,411.2 | 48.3% | 7,387 |
| 2015 | 2,088.6 | 41.8% | 7,383 |
| 2016 | 2,086.7 | 41.7% | 7,403 |
| 2017 | 1,940.2 | 38.9% | 7,372 |
| 2018 | 2,071.7 | 41.5% | 7,244 |
| 2019 | 2,981.2 | 59.7% | 7,252 |
| 2020 | 2,368 | 47.3% | 7,264 |
| 2021 | 3,449 | 69.1% | 7,220 |
| 2022 | 2,974.8 | 59.6% | 7,252 |
| 2023 | 3,670.7 | 73.5% | 7,262 |
| 2024 | 3,779 | 75.5% | 7,326 |
| 2025 | 3,781.3 | 75.7% | 7,368 |
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 |
|---|---|---|---|---|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | CT | 176.6 | 147 | Jan 2002 | Operating | — | coming soon |
| CTG2 | Natural Gas Fired Combined Cycle | CT | 176.6 | 147 | Jan 2002 | Operating | — | coming soon |
| STG | Natural Gas Fired Combined Cycle | CA | 301.8 | 276 | Jan 2002 | Operating | — | coming soon |
Owner / operator
Operator: Star West Gen Griffith Energy LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Star West Gen Griffith Energy LLC | 100.0% | 655 MW |
Nearby plants
Within 80 km.
| Black Mountain Generating Station | 121 MW | 3.1 km |
| Black Mountain Solar LLC | 9 MW | 4.4 km |
| Kingman Energy Storage | 50 MW | 8.2 km |
| Sierra Solar | — | 9.7 km |
| Kingman 1 | 11 MW | 11.8 km |
| La Senita | 1 MW | 23.9 km |