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Union Power Station

Union County, Arkansas · EIA plant ID 55380 · Operator: Entergy Arkansas Inc
Natural gasNatural Gas Fired Combined CycleMISOBA: MISO
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Nameplate2,428MWSummer 2,049 MW
Generators12in service
Net generation12,682GWh12 mo to Aug 2026
Capacity factor71%gas/coal/oil units, summer MW
Heat rate7,268Btu/kWhfossil units, electric fuel, HHV
First online2003Runs 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
05001,000GWh200420062008201020122014201620182020202220242026

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.
0%25%50%75%2005201020152020202570.7% · 12 mo

Heat rate by year

Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
7,0007,2007,4007,600200520102015202020257,268 Btu/kWh · 12 mo
Annual data table
YearNet GWhCapacity factorHeat rate (Btu/kWh)
20042,603.314.7%7,365
20052,900.916.4%7,576
20064,464.725.2%7,484
20073,581.920.2%7,478
20082,546.414.3%7,471
20094,215.123.8%7,404
20106,376.936.0%7,427
20117,190.240.6%7,311
20129,911.355.9%7,224
20136,26735.4%7,478
20146,248.635.3%7,426
20158,414.347.5%7,599
20169,459.452.8%7,431
20179,869.156.7%7,334
201810,305.258.6%7,305
201911,267.563.9%7,265
20209,620.754.3%7,261
202111,206.863.5%7,252
202212,788.472.5%7,250
202313,416.575.4%7,221
20249,989.455.8%7,283
202510,096.256.3%7,319

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 IDTechnologyPrime moverNameplate MWSummer MWOnlineStatusPlanned retirementOEM / model
CTG1Natural Gas Fired Combined CycleCT176—Jan 2003Operating—coming soon
CTG2Natural Gas Fired Combined CycleCT176—Jan 2003Operating—coming soon
CTG3Natural Gas Fired Combined CycleCT176—Apr 2003Operating—coming soon
CTG4Natural Gas Fired Combined CycleCT176—Apr 2003Operating—coming soon
CTG5Natural Gas Fired Combined CycleCT176—May 2003Operating—coming soon
CTG6Natural Gas Fired Combined CycleCT176—May 2003Operating—coming soon
CTG7Natural Gas Fired Combined CycleCT176—Jun 2003Operating—coming soon
CTG8Natural Gas Fired Combined CycleCT176—Jun 2003Operating—coming soon
STG1Natural Gas Fired Combined CycleCA255512.4Jan 2003Operating—coming soon
STG2Natural Gas Fired Combined CycleCA255508.7Apr 2003Operating—coming soon
STG3Natural Gas Fired Combined CycleCA255513.6May 2003Operating—coming soon
STG4Natural Gas Fired Combined CycleCA255513.9Jun 2003Operating—coming soon

Owner / operator

Operator: Entergy Arkansas Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
Entergy Louisiana LLC50.0%1,214 MW
Entergy New Orleans, LLC25.0%607 MW
Entergy Arkansas Inc25.0%607 MW

Nearby plants

Within 80 km.
El Dorado AR2 MW9.7 km
General Dynamics7 MW34.3 km
McClellan (AR)136 MW35.3 km
SR Camden12 MW38.8 km
SAU Tech1 MW54.9 km
Georgia-Pacific Crossett LLC25 MW59.7 km