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Union Power Station — Power plant · Gas, combined cycle · Entergy Arkansas LLC
  • Combustion
  • Operating
  • 10 · 100 · 1,000 MW

Union Power Station

Power plant · Gas, combined cycle

Key facts

Power plant · Gas, combined cycleran 47% of 2025 Operating
Capacity
Capacity: sourceEIA-860M · Open licenseMW
Commissioned
2003
Net generation, 2025
10,096,173 MWh
Grid
500 kV to Entergy Arkansas Inc (MISO)
Location
Union County, Arkansas

Output

Net generation MWh by year, 2004 to 2026
Fuel burned MMBtu by year, 2004 to 2026
  • Gas

Operations detail

Details

Who’s behind it

Owner
Entergy Corp, Entergy Louisiana LLC, Entergy New Orleans, LLC

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Technology
Gas, combined cycle source: “Natural Gas Fired Combined Cycle”
Age
23 years since 2003
Unused energy
11,173 GWh 2025Unused energyA lead, not a guarantee: MW × hours × (1 − capacity factor) for the latest year (EIA-923), gas, coal and oil plants only. Air-permit run-hour caps, heat rate (cost to run) and capacity-market or reliability obligations can rule it out.
Heat rate
7,319 Btu/kWh 2025
All 8 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory
AttributeValue
Gem
Parents
Name
Entergy Louisiana LLC
Share pct
100
Gem entity id
E100000002988
Name
Entergy Corp
Share pct
100
Gem entity id
E100000001209
Unit ids
G100000401903, G100000401904, G100000401905, G100000401906
Location id
L100000401911
Eia plant ids
55380
Grid
Nerc region
SERC
Report year
2025
Grid voltage kv
500
Transmission owner
Entergy Arkansas Inc
Balancing authority code
MISO
Balancing authority name
Midcontinent Independent Transmission System Operator, Inc..
EPA greenhouse gas reporting (GHGRP)
EPA FRS ID
110010063858
Subparts reported
D
NAICS code
221112
Subpart PP (CO2 supply)
No
Subpart RR (geologic sequestration)
No
Subpart UU (CO2 injection)
No
Reporting year
2023
GHGRP facility ID
1000800
Fuel burned (MMBtu), 202573,897,618
Capacity factor, 20250.475
Heat rate (Btu/kWh), 20257,319.4
Net generation (MWh), 202510,096,173
Balancing authority codeMISO

Ownership

4 companies4
CompanyRoleShareAs ofSource
Entergy Arkansas LLC Operator EIA-860M
Entergy Corp Owner 100.0% 31 Dec 2023 EPA GHGRP
Entergy New Orleans, LLC Owner 25.0% 31 Dec 2025 EIA-860
Entergy Louisiana LLC Owner 50.0% 31 Dec 2025 EIA-860

Timeline

  • In service · EIA-860M

Sources

6 sources

Sources EIA-860M · GEM · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory · EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT) · EIA-860 Annual Electric Generator Report — Schedule 4 Owner (ownership shares per generator), plus Plant/Generator schedules

Sources

Every source and license · Attribution

View at source