Harry L. Oswald
Natural gas power plant in Pulaski County, Arkansas. 599.5 MW of nameplate capacity across 9 generators, operated by Arkansas Electric Coop Corp.
Also known as Harry L. Oswald Generating Station · EIA plant 55221
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 599.5 MWNameplate
- Generators
- 9 operatingEIA-860M, August 2026
- Operating since
- July 2002First generator online
- Operator
- Arkansas Electric Coop CorpEIA operator ID 807
- Grid
- MISOBalancing authority MISO
- Price nodes
- 1 MISO nodeResource nodes with prices
- Location
- Pulaski County, AR34.5923, −92.2166
- EIA plant ID
- 55221EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Harry L. Oswald produces
Free · EIA-923Net generation, 2025
929 GWh
929,305 MWh, final
Capacity factor, 2025
17.7%
2024: 21.8%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2016 to 2025
0.3–1.1
TWh a year. Low 2017, high 2024
| 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 | 319,820 | Not reported | 6 of 12 |
| 2003 | 202,717 | Not reported | 12 of 12 |
| 2004 | 0 | Not reported | 12 of 12 |
| 2005 | 0 | Not reported | 11 of 12 |
| 2006 | 348,972 | Not reported | 12 of 12 |
| 2007 | 301,753 | Not reported | 12 of 12 |
| 2008 | 207,414 | Not reported | 12 of 12 |
| 2009 | 160,490 | Not reported | 12 of 12 |
| 2010 | 458,047 | 8.7% | 12 of 12 |
| 2011 | 792,600 | 15.1% | 12 of 12 |
| 2012 | 356,365 | 6.8% | 12 of 12 |
| 2013 | 317,735 | Not reported | 12 of 12 |
| 2014 | 159,242 | 3.0% | 12 of 12 |
| 2015 | 349,389 | 7.2% | 11 of 12 |
| 2016 | 519,479 | 9.9% | 12 of 12 |
| 2017 | 310,375 | 5.9% | 12 of 12 |
| 2018 | 522,540 | 10.0% | 12 of 12 |
| 2019 | 368,940 | 7.0% | 12 of 12 |
| 2020 | 479,813 | 9.1% | 12 of 12 |
| 2021 | 673,397 | 12.8% | 12 of 12 |
| 2022 | 998,504 | 19.0% | 12 of 12 |
| 2023 | 941,018 | 17.9% | 12 of 12 |
| 2024 | 1,149,051 | 21.8% | 12 of 12 |
| 2025 | 929,305 | 17.7% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 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 account · MISOEmissions
Free · EPA CAMPDCO₂, 2024
529,217
US short tons. 2023: 426,962
SO₂, 2024
3
US short tons
NOx, 2024
445
US short tons
CO₂ per MWh, calculated
0.46 t
About 921 lb per MWh
7 of 7 EPA units reported CO₂ in 2024 (G1, G2, G3, G4, G5, G6, G7), matched to EIA plant 55221 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
383
million gallons
Consumption, 2024
348
million gallons
Source
Municipal
Ground, Fresh. Induced-draft tower
Watershed stress
Low · 0.390
USGS SUI, HUC12 Gar Slough-Arkansas River
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 |
|---|---|---|---|
| G1 | Natural Gas Fired Combined Cycle | 51.0 | July 2002 |
| G2 | Natural Gas Fired Combined Cycle | 51.0 | July 2002 |
| G3 | Natural Gas Fired Combined Cycle | 51.0 | July 2002 |
| G4 | Natural Gas Fired Combined Cycle | 51.0 | July 2002 |
| G5 | Natural Gas Fired Combined Cycle | 51.0 | July 2002 |
| G6 | Natural Gas Fired Combined Cycle | 51.0 | July 2002 |
| G7 | Natural Gas Fired Combined Cycle | 83.5 | July 2002 |
| G8 | Natural Gas Fired Combined Cycle | 105.0 | July 2002 |
| G9 | Natural Gas Fired Combined Cycle | 105.0 | July 2002 |
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 Arkansas Electric Coop Corp 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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Power plants near Harry L. Oswald
More plants operated by Arkansas Electric Coop Corp
Questions about Harry L. Oswald
How much power does Harry L. Oswald produce?
Harry L. Oswald reported 929,305 MWh (929 GWh) of net generation in 2025, a 17.7% capacity factor on 599.5 MW of nameplate capacity.
Where is Harry L. Oswald?
Harry L. Oswald is in Pulaski County, Arkansas, at 34.5923, −92.2166. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Harry L. Oswald?
EIA-860M for August 2026 lists Arkansas Electric Coop Corp as the operator (EIA operator ID 807). The operator is not always the owner.
When did Harry L. Oswald start operating?
Its first generator began operating in July 2002, according to EIA-860M.
Does InfraMap have power prices for Harry L. Oswald?
Yes. InfraMap has MISO day-ahead and real-time prices at 1 price node linked to Harry L. Oswald, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
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
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- 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