Harquahala Generating Project
Maricopa County, Arizona · EIA plant ID 55372 · Operator: New Harquahala Generating Co, LLC
Nameplate1,277MWSummer 1,043 MW
Generators6in service
Net generation2,910GWh12 mo to Aug 2026
Capacity factor32%gas/coal/oil units, summer MW
Heat rate7,204Btu/kWhfossil units, electric fuel, HHV
First online2004Runs as intermediate
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) |
|---|---|---|---|
| 2004 | 22.2 | 0.5% | 10,063 |
| 2005 | 805.3 | 8.7% | 7,228 |
| 2006 | 1,196.4 | 13.0% | 7,171 |
| 2007 | 3,007.7 | 32.6% | 6,317 |
| 2008 | 3,004.2 | 32.4% | 7,365 |
| 2009 | 3,102.2 | 33.6% | 7,439 |
| 2010 | 1,692.2 | 18.3% | 7,355 |
| 2011 | 493.9 | 5.3% | 7,707 |
| 2012 | 1,444.2 | 15.6% | 7,202 |
| 2013 | 1,654.5 | 17.9% | 7,184 |
| 2014 | 1,311 | 14.7% | 7,238 |
| 2015 | 1,516.4 | 17.0% | 7,040 |
| 2016 | 3,373.7 | 36.8% | 7,035 |
| 2017 | 1,880.7 | 20.6% | 7,119 |
| 2018 | 3.8 | 0.0% | 9,826 |
| 2019 | 0 | 0.0% | — |
| 2020 | 0 | 0.0% | — |
| 2021 | 2,238.5 | 24.5% | 7,148 |
| 2022 | 2,674.2 | 29.3% | 7,193 |
| 2023 | 2,326.5 | 25.5% | 7,340 |
| 2024 | 3,343.4 | 36.5% | 7,322 |
| 2025 | 2,896.6 | 31.7% | 7,130 |
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 | 281.7 | 239.9 | Jun 2004 | Operating | — | coming soon |
| CTG2 | Natural Gas Fired Combined Cycle | CT | 281.7 | 226.6 | Sep 2004 | Operating | — | coming soon |
| CTG3 | Natural Gas Fired Combined Cycle | CT | 281.7 | 226.2 | Aug 2004 | Operating | — | coming soon |
| STG1 | Natural Gas Fired Combined Cycle | CA | 144 | 119.8 | Jun 2004 | Operating | — | coming soon |
| STG2 | Natural Gas Fired Combined Cycle | CA | 144 | 114.9 | Sep 2004 | Operating | — | coming soon |
| STG3 | Natural Gas Fired Combined Cycle | CA | 144 | 115.5 | Aug 2004 | Operating | — | coming soon |
Owner / operator
Operator: New Harquahala Generating Co, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| BlackRock Inc. | 50.0% | 639 MW |
| Capital Power Corporation | 50.0% | 639 MW |
Nearby plants
Within 80 km.
| Maricopa Solar | 550 MW | 1.5 km |
| Harquahala 2 | 600 MW | 1.8 km |
| Harquahala Sun Solar Project | 150 MW | 4.4 km |
| Desert Sand BESS | — | 6.2 km |
| Papago PV | 150 MW | 6.7 km |
| Papago Energy Storage | 300 MW | 7.1 km |