2428 MW Natural Gas operating in Union, AR — Midcontinent Independent Transmission System Operator, Inc..
2,428 MW
Nameplate Capacity
12
Generators
units
Natural Gas Fired Combined Cycle
Technology
2003
Operating Since
| 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 | — | — |
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
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
606.4K MWh
Latest Month
10.1M MWh
Annual Generation
47.3%
Capacity Factor
$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
Point 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
Last updated 2026-03-26
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