Neptune Gas Processing Plant
Other power plant · St Mary County, Louisiana
Nameplate capacity
4.5 MW
Rank in Louisiana
#93
of 98 plants
In service since
2004
February 2004
Details
- Primary fuel
- Other
- Technology
- All Other
- Operator
- Enterprise Products Optg LP
- County
- St Mary County
- Generating units
- 1
- Share of state capacity
- 0.02%
- Rank among other plants in Louisiana
- #20 of 21
- EIA plant code
- 56139
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| NPCG | All Other | 4.5 MW | 3.1 MW | 2004 | 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 Louisiana
| Eunice LA Plant | Natural gas | 4.7 MW |
| Fort Polk (fka Johnson) - Chaffee West | Solar | 4.5 MW |
| PPG Plant C Caustic | Natural gas | 3.4 MW |
| TCI Alvar | Solar | 1.9 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 4.5 MW solar plant and a 4.5 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 Louisiana power plants · What Louisiana actually generates