Union Power Station
Natural gas power plant · Union County, Arkansas
Nameplate capacity
2,428 MW
Rank in Arkansas
#1
of 122 plants
In service since
2003
January 2003
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combined Cycle
- Operator
- Entergy Arkansas LLC
- County
- Union County
- Generating units
- 12
- Share of state capacity
- 12.70%
- Rank among natural gas plants in Arkansas
- #1 of 18
- EIA plant code
- 55380
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| STG1 | Natural Gas Fired Combined Cycle | 255 MW | 512 MW | 2003 | Operating |
| STG2 | Natural Gas Fired Combined Cycle | 255 MW | 509 MW | 2003 | Operating |
| STG3 | Natural Gas Fired Combined Cycle | 255 MW | 514 MW | 2003 | Operating |
| STG4 | Natural Gas Fired Combined Cycle | 255 MW | 514 MW | 2003 | Operating |
| CTG1 | Natural Gas Fired Combined Cycle | 176 MW | — | 2003 | Operating |
| CTG2 | Natural Gas Fired Combined Cycle | 176 MW | — | 2003 | Operating |
| CTG3 | Natural Gas Fired Combined Cycle | 176 MW | — | 2003 | Operating |
| CTG4 | Natural Gas Fired Combined Cycle | 176 MW | — | 2003 | Operating |
| CTG5 | Natural Gas Fired Combined Cycle | 176 MW | — | 2003 | Operating |
| CTG6 | Natural Gas Fired Combined Cycle | 176 MW | — | 2003 | Operating |
| CTG7 | Natural Gas Fired Combined Cycle | 176 MW | — | 2003 | Operating |
| CTG8 | Natural Gas Fired Combined Cycle | 176 MW | — | 2003 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Arkansas
| Arkansas Nuclear One | Nuclear | 1,845 MW |
| Independence Steam Electric Station | Coal | 1,800 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 2,428 MW solar plant and a 2,428 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Arkansas power plants · What Arkansas actually generates