Neptune Gas Processing Plant
Neptune Gas Processing Plant is a 5 MW power plant in St Mary County, Louisiana, operated by Enterprise Products Optg LP. EIA-860M lists 1 generating unit here, inside MISO. Its unit entered service in 2004.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 4.5 MW
- 3.1 MW net summer
- Generating units
- 1
- In service
- 2004
- EIA plant ID
- 56139
Where it is
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- County
- St Mary County, Louisiana
- Coordinates
- 29.7336, -91.4431
- Balancing authority
- MISO
- Sector
- Industrial CHP
Units, technology and status
- Operator of record
- Enterprise Products Optg LP
- Primary energy source
- Other
- Technologies
- All Other
- Status
- Operating
Neptune Gas Processing Plant: FAQ
- Where is Neptune Gas Processing Plant?
- In St Mary County, Louisiana (LA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Neptune Gas Processing Plant?
- 5 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Neptune Gas Processing Plant?
- EIA-860M names Enterprise Products Optg LP as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Neptune Gas Processing Plant LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Enterprise Products Optg LP here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Neptune Gas Processing Plant LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Neptune Gas Processing Plant still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.