Harquahala Generating Project
Natural gas power plant in Maricopa County, Arizona. 1,277.1 MW of nameplate capacity across 6 generators, operated by New Harquahala Generating Co, LLC.
Also known as Harquahala Generating Station · EIA plant 55372
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 1,277.1 MWNameplate
- Generators
- 6 operatingEIA-860M, August 2026
- Operating since
- June 2004First generator online
- Operator
- New Harquahala Generating Co, LLCEIA operator ID 32790
- Grid
- SRPBalancing authority SRP
- Price nodes
- None linkedNo verified ISO node
- Location
- Maricopa County, AZ33.4760, −113.1134
- EIA plant ID
- 55372EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Harquahala Generating Project produces
Free · EIA-923Net generation, 2025
2.90 TWh
2,896,555 MWh, final
Capacity factor, 2025
25.9%
2024: 29.8%
January to July 2026
1.43 TWh
Provisional
Range, 2015 to 2025
0.0–3.4
TWh a year. Low 2019, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | 22,216 | Not reported | 4 of 12 |
| 2005 | 805,301 | Not reported | 12 of 12 |
| 2006 | 1,196,428 | Not reported | 12 of 12 |
| 2007 | 3,007,705 | Not reported | 12 of 12 |
| 2008 | 3,004,177 | Not reported | 12 of 12 |
| 2009 | 3,102,211 | Not reported | 12 of 12 |
| 2010 | 1,692,211 | 14.6% | 12 of 12 |
| 2011 | 493,883 | 4.3% | 12 of 12 |
| 2012 | 1,444,228 | 12.4% | 12 of 12 |
| 2013 | 1,654,489 | Not reported | 12 of 12 |
| 2014 | 1,311,008 | 11.3% | 12 of 12 |
| 2015 | 1,516,370 | 13.1% | 12 of 12 |
| 2016 | 3,373,732 | 29.0% | 12 of 12 |
| 2017 | 1,880,728 | 16.2% | 12 of 12 |
| 2018 | 3,815 | 0.0% | 12 of 12 |
| 2019 | 0 | 0.0% | 12 of 12 |
| 2020 | 0 | 0.0% | 12 of 12 |
| 2021 | 2,238,544 | Not reported | 12 of 12 |
| 2022 | 2,674,207 | 23.9% | 12 of 12 |
| 2023 | 2,326,465 | 20.8% | 12 of 12 |
| 2024 | 3,343,384 | 29.8% | 12 of 12 |
| 2025 | 2,896,555 | 25.9% | 12 of 12 |
| 2026 (provisional, partial year) | 1,425,834 | 21.9% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
1.22M
US short tons. 2024: 1.40M
SO₂, 2025
6
US short tons
NOx, 2025
75
US short tons
CO₂ per MWh, calculated
0.42 t
About 842 lb per MWh
3 of 3 EPA units reported CO₂ in 2025 (CTG1, CTG2, CTG3), matched to EIA plant 55372 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
1,124
million gallons
Consumption, 2024
1,124
million gallons
Source
Centarl Arizona Project, Wells
Ground, Fresh. Induced-draft tower
Watershed stress
Severe · 0.965
USGS SUI, HUC12 Harquahala Plain
12 of 12 cooling months report withdrawal. Groundwater user; SUI describes surface water and is context only. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | 281.7 | June 2004 |
| CTG2 | Natural Gas Fired Combined Cycle | 281.7 | September 2004 |
| CTG3 | Natural Gas Fired Combined Cycle | 281.7 | August 2004 |
| STG1 | Natural Gas Fired Combined Cycle | 144.0 | June 2004 |
| STG2 | Natural Gas Fired Combined Cycle | 144.0 | September 2004 |
| STG3 | Natural Gas Fired Combined Cycle | 144.0 | August 2004 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists New Harquahala Generating Co, LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Harquahala Generating Project
How much power does Harquahala Generating Project produce?
Harquahala Generating Project reported 2,896,555 MWh (2.90 TWh) of net generation in 2025, a 25.9% capacity factor on 1,277.1 MW of nameplate capacity. From January to July 2026 it reported 1.43 TWh, which is provisional.
Where is Harquahala Generating Project?
Harquahala Generating Project is in Maricopa County, Arizona, at 33.4760, −113.1134. It is in the Salt River Project balancing area (SRP).
Who operates Harquahala Generating Project?
EIA-860M for August 2026 lists New Harquahala Generating Co, LLC as the operator (EIA operator ID 32790). The operator is not always the owner.
When did Harquahala Generating Project start operating?
Its first generator began operating in June 2004, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page