MARYDALE
SubstationLouisiana · ENTERGY GULF STATES - LA LLC
At a glance
MARYDALE is an electric transmission substation in Louisiana, on ENTERGY GULF STATES - LA LLC's transmission network. It is classified as distribution (69–115 kv) and connects 2 transmission lines. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.
Voltage & classification
Ownership
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #104963 | 69 kV | ENTERGY GULF STATES - LA LLC | IN SERVICE | 0.0 mi |
| #104020 | — | ENTERGY GULF STATES - LA LLC | IN SERVICE | 5.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of MARYDALE, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| UNKNOWN112075 | Substation-Adjacent | LA | West Feliciana Parish | 500 kV | 1,000 MW | 4.3 yrs | 69.2 |
| FANCY POINT | Substation-Adjacent | LA | West Feliciana Parish | 500 kV | 1,000 MW | 4.3 yrs | 65.0 |
| OAK VILLA | Substation-Adjacent | LA | East Baton Rouge Parish | 230 kV | 300 MW | 4.3 yrs | 64.7 |
| HAZEL | Substation-Adjacent | LA | East Baton Rouge Parish | 230 kV | 300 MW | 4.3 yrs | 64.7 |
| UNKNOWN111776 | Substation-Adjacent | LA | East Baton Rouge Parish | 230 kV | 300 MW | 4.3 yrs | 64.1 |
| ESSO | Substation-Adjacent | LA | East Baton Rouge Parish | 230 kV | 300 MW | 4.3 yrs | 63.8 |
| EXXON | Substation-Adjacent | LA | East Baton Rouge Parish | 230 kV | 300 MW | 4.3 yrs | 63.8 |
| DELMONT | Substation-Adjacent | LA | East Baton Rouge Parish | 230 kV | 300 MW | 4.3 yrs | 63.8 |
How does MARYDALE compare with other substations in Louisiana?
Louisiana has 1,305 substation records in HIFLD, of which 297 carry a station name; the rest are unnamed tap points, risers and line ends. 62 named substations in the state are in MARYDALE's 69–114 kV band (21% of named stations). 181 sit in a higher band. 17 named substations in Louisiana operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 138 kV.
Who owns the transmission lines at MARYDALE?
The 2 connected lines listed above are owned by ENTERGY GULF STATES - LA LLC. Line voltages range from 69 kV to 69 kV. Their combined recorded length is about 5.5 miles.
How do candidate sites near MARYDALE score?
The 8 highest-scoring candidate sites within about 25 miles range from 64 to 69 on the 0–100 DC Readiness scale. They fall in West Feliciana Parish, East Baton Rouge Parish. The Louisiana average across 1,762 scored sites is 53.1. 615 of those Louisiana sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is MARYDALE substation?
MARYDALE has a maximum voltage of 69 kV. That places it in the 69–114 kV band. The median named US substation in this dataset is 115 kV, so MARYDALE is below the national midpoint.
How many transmission lines connect to MARYDALE substation?
2 transmission lines terminate at or pass through MARYDALE in the HIFLD line data. The connected lines listed here run at 69 kV. Together the listed lines cover about 5.5 miles.
Who owns MARYDALE substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at MARYDALE belong to ENTERGY GULF STATES - LA LLC. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is MARYDALE substation located?
MARYDALE is in Louisiana at 30.8473, -91.3014. The datacenter candidate sites closest to it are in West Feliciana Parish, East Baton Rouge Parish.
Are there datacenter candidate sites near MARYDALE substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of MARYDALE. The highest-scoring is UNKNOWN112075 at 69/100. Across Louisiana, the average DC Readiness score is 53.1.
Other 69 kV substations in Louisiana
- CHLOMAL· 6 lines
- BLOUNT· 5 lines
- PINHOOK· 4 lines
- BRADY HEIGHTS· 3 lines
- CHOUPIQUE· 3 lines
- ELLERBE ROAD· 3 lines
- HARDY· 3 lines
- JACKSON· 3 lines
- All named substations in Louisiana· 297 stations
- Datacenter candidate sites in Louisiana· 1,762 sites
- Brownfield and retired plant sites in Louisiana
- Substations by state
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “MARYDALE substation, Louisiana”, https://gridcensus.com/substations/louisiana/marydale-93fdf8ec (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.
Go deeper than the public screen
Every site and score for MARYDALE substation, Louisiana is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.