Union Power Station — Plant Summary
- EIA Plant ID
- 55380
- Capacity
- 2428 MW
- Primary Fuel
- Natural Gas
- Technology
- Natural Gas Fired Combined Cycle
- Status
- Operating
- Location
- Union, AR
- Operating Since
- 2003
- Generators
- 12
- Operator
- Entergy Arkansas LLC
- Parent Company
- Entergy
- Annual Generation
- 10,096,173 MWh
- Capacity Factor
- 47.3%
- Balancing Authority
- Midcontinent Independent Transmission System Operator, Inc..
- ISO/RTO
- MISO
- NERC Region
- SERC
Union Power Station
OperatingNatural Gas
Ranked #1 of 18 Natural Gas plants in AR#12 of 2009 nationally
2428 MW Natural Gas operating in Union, AR — Midcontinent Independent Transmission System Operator, Inc..
EIAWD
2,428 MW
Nameplate Capacity
12
Generators
units
Natural Gas Fired Combined Cycle
Technology
2003
Operating Since
Location
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Entergy Arkansas LLC | Entergy New Orleans | — |
| Owner(s) | Entergy Arkansas LLC, Entergy Louisiana LLC, Entergy New Orleans, LLC | Entergy | — |
| Status | Operating | — | — |
Ownership Chain
About
Union Power Station is a 2428 MW natural gas-fired combined cycle power plant located in Union County, Arkansas. The plant began operating in 2003 and consists of 12 generators. It is owned by Entergy and operated by Entergy Arkansas LLC. Union Power Station is the largest power plant in Arkansas (ranked 1 of 12) and the 16th largest in the United States (ranked 16 of 945).
The plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the SERC NERC region. In the latest year of available data, Union Power Station generated 10,096,173 MWh, achieving a capacity factor of 47.3%. Financial data indicates an installed cost of $513.34 per kW, based on FERC filings.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
SERC
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc..
Grid Voltage
500 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Generation
606.4K MWh
Latest Month
10.1M MWh
Annual Generation
47.3%
Capacity Factor
Dec 2022 – Dec 2025
Financial DataBeta
Source: FERC Form 1HIGH
$554/kW
Installed Cost
$24.1/MWh
Operating Cost
Entergy Louisiana, LLC
Reporting Utility
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Pricing & Market Data
HIGH confidencePoint of Interconnection
Nearest Substation
Union Power Project Switchyard · 500 kV
Substation Distance
< 10 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
EAI.PUPP1_ST
Pricing Hub
ARKANSAS.HUB
Node Source
EIA-860 direct report
News & Articles (10)Beta
General
Entergy Arkansas powers Google’s $4B investment in the state
Today at a joint community celebration with state and local leaders, Entergy Arkansas announced it will power Google's planned $4 billion...
Entergy·5 months ago
General
Arkansas utility seeks approval of 1.4GWh hybrid BESS, with financial support from Google as part of data centre deal
Entergy is seeking regulatory approval from the Arkansas PSC to construct what could become the largest BESS in the southern US State.
Energy-Storage.News·6 months ago
General
Arkansas utility seeks approval of 1.4GWh hybrid BESS, with financial support from Google as part of data centre deal
Entergy is seeking regulatory approval from the Arkansas PSC to construct what could become the largest BESS in the southern US State.
Energy-Storage.News·6 months ago
General
Texas regulators approve 2 Entergy gas plants with $2.4B ‘hard cap’
The new resources are necessary, said PUCT Chair Thomas Gleeson, “but we also have the mandate to protect customers, and I think this...
Utility Dive·6 months ago
Last updated 2026-03-26
View all 10 articles