Union Power Station

🔥 Natural GasElectric Utility2,428 MW capacity

1st largest plant in Arkansas · 43rd nationally

Union Power Station is a natural gas power plant in Arkansas with a nameplate capacity of 2,428 MW. It generates roughly 13.4M MWh per year — enough to power about 1,277,759 average U.S. homes.

Its capacity factor of 63% puts it in the middle range — running steadily but not full-time. At 863 lb CO₂/MWh, its emission rate sits above the national grid average of roughly 800 lb/MWh.

PeakingMid-meritBaseload0%40%80%100%63%
Mid-merit — steady but not full-time

Month by month in 2024

100% capacity0Jan: 1.0M MWh (56% of capacity)JFeb: 99.8k MWh (6% of capacity)FMar: 715.5k MWh (40% of capacity)MApr: 519.1k MWh (30% of capacity)AMay: 969.9k MWh (54% of capacity)MJun: 1.3M MWh (75% of capacity)JJul: 1.4M MWh (79% of capacity)JAug: 1.2M MWh (68% of capacity)ASep: 784.5k MWh (45% of capacity)SOct: 912.6k MWh (51% of capacity)ONov: 999.5k MWh (57% of capacity)ND

Ghost bars are each month's theoretical maximum (2,428 MW nameplate × hours in the month). Filled bars are actual net generation reported to EIA Form 923. The gap between them is capacity factor made visible.

Capacity2,428 MWnameplate
Annual Generation13.4M MWhEPA eGRID
Capacity Factor63%of theoretical max
Annual CO₂5.8Mmetric tons

Location

Plant NameUnion Power Station
OperatorEntergy Arkansas Llc
CityEl Dorado
CountyUnion County
StateArkansas
ZIP71730
Coordinates33.29615, -92.58936

This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.

Natural GasSolar

Generators (12)

IDTechnologyFuelCapacityStatusOnline
STG1Natural Gas Fired Combined CycleNatural Gas255 MWOperating2003
STG2Natural Gas Fired Combined CycleNatural Gas255 MWOperating2003
STG3Natural Gas Fired Combined CycleNatural Gas255 MWOperating2003
STG4Natural Gas Fired Combined CycleNatural Gas255 MWOperating2003
CTG1Natural Gas Fired Combined CycleNatural Gas176 MWOperating2003
CTG2Natural Gas Fired Combined CycleNatural Gas176 MWOperating2003
CTG3Natural Gas Fired Combined CycleNatural Gas176 MWOperating2003
CTG4Natural Gas Fired Combined CycleNatural Gas176 MWOperating2003
CTG5Natural Gas Fired Combined CycleNatural Gas176 MWOperating2003
CTG6Natural Gas Fired Combined CycleNatural Gas176 MWOperating2003
CTG7Natural Gas Fired Combined CycleNatural Gas176 MWOperating2003
CTG8Natural Gas Fired Combined CycleNatural Gas176 MWOperating2003

Ownership

OwnerLocationShare
Entergy New Orleans, LlcNew Orleans, LA10000.0%
Entergy Louisiana LlcJefferson, LA10000.0%

Ownership reported to EIA Form 860. Percentages reflect reported generator-level ownership share, averaged when a plant has multiple generators.

Emissions (annual)

CO₂5.8M metric tons
SO₂29 metric tons
NOₓ602 metric tons
CO₂ Rate863 lb/MWh
U.S. grid average800 lb/MWhThis plant863 lb/MWhNatural gas combined-cycle average900 lb/MWhCoal plant average2,100 lb/MWh

Annual totals and CO₂ rate reported by EPA eGRID for 2023. Reference averages are approximate U.S.-wide figures from the same dataset.

Grid context

NERC RegionSERC
Balancing AuthorityMidcontinent Independent Transmission System Operator, Inc..

About Natural Gas plants

Natural gas plants are the workhorse of the modern grid. Combined-cycle units achieve very high efficiency and can ramp up and down quickly to balance variable renewables. They emit roughly half the CO₂ per MWh of coal and far less of other pollutants, but they still release upstream methane during fuel extraction.

Other plants in Union County

View all plants in Union County →

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