Poseidon Solar, LLC
GILA County, Arizona · EIA plant ID 57318 · Operator: Axium Arizona Renewables, LLC
Nameplate20MWSummer 20 MW
Generators1in service
Net generation49GWh12 mo to Dec 2025
Capacity factor28%solar units, summer MW
Heat rate—thermal plants only
First online2011
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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2011 | 16.6 | 111.3% | — |
| 2012 | 51.1 | 29.1% | — |
| 2013 | 53.4 | 30.5% | — |
| 2014 | 53 | 30.3% | — |
| 2015 | 51.8 | 29.5% | — |
| 2016 | 54.2 | 30.9% | — |
| 2017 | 52.6 | 30.0% | — |
| 2018 | 50.1 | 28.6% | — |
| 2019 | 51.4 | 29.4% | — |
| 2020 | 52.9 | 30.1% | — |
| 2021 | 51.1 | 29.2% | — |
| 2022 | 52.4 | 29.9% | — |
| 2023 | 51.4 | 29.3% | — |
| 2024 | 50.2 | 28.6% | — |
| 2025 | 48.8 | 27.8% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Solar Photovoltaic | PV | 20 | 20 | Dec 2011 | Operating | — | coming soon |
Owner / operator
Operator: Axium Arizona Renewables, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Avangrid Power LLC | 50.0% | 10 MW |
| Axium Arizona Renewables, LLC | 50.0% | 10 MW |
Nearby plants
Within 80 km.
| Copper Crossing Energy Center | 153 MW | 0.6 km |
| Banner Solar Ironwood | 1 MW | 9.7 km |
| Box Canyon (AZ) | 300 MW | 10.7 km |
| Sandstone Solar | 45 MW | 14.8 km |
| Queen Creek Solar Farm | 19 MW | 16.8 km |
| Bonnybrooke PV | 50 MW | 18 km |