GRANNIS
SubstationArkansas · SOUTHWEST ARKANSAS ELECTRIC COOPERATIVE CORORATION
At a glance
GRANNIS is an electric transmission substation in Arkansas, on SOUTHWEST ARKANSAS ELECTRIC COOPERATIVE CORORATION's transmission network. It is classified as distribution (69–115 kv) and connects 1 transmission line. 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 |
|---|---|---|---|---|
| #161934 | 69 kV | SOUTHWEST ARKANSAS ELECTRIC COOPERATIVE CORORATION | IN SERVICE | 2.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of GRANNIS, 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 |
|---|---|---|---|---|---|---|---|
| EC FFE Sevier County | Greenfield | AR | Sevier County | — | — | 4.3 yrs | 58.0 |
| EC FFE Howard County | Greenfield | AR | Howard County | — | — | 4.3 yrs | 57.9 |
| OZ Sevier | Greenfield | AR | Sevier | — | — | 4.3 yrs | 57.3 |
| UNKNOWN121779 | Substation-Adjacent | AR | Howard County | 138 kV | 100 MW | 4.3 yrs | 57.1 |
| UNKNOWN121613 | Substation-Adjacent | AR | Sevier County | 138 kV | 100 MW | 4.3 yrs | 57.0 |
| LOCKENSBURG | Substation-Adjacent | AR | Sevier County | 138 kV | 100 MW | 4.3 yrs | 56.5 |
| UNKNOWN118743 | Substation-Adjacent | OK | McCurtain County | 138 kV | 100 MW | 4.3 yrs | 56.2 |
| UNKNOWN118744 | Substation-Adjacent | OK | McCurtain County | 138 kV | 100 MW | 4.3 yrs | 56.2 |
How does GRANNIS compare with other substations in Arkansas?
Arkansas has 1,025 substation records in HIFLD, of which 174 carry a station name; the rest are unnamed tap points, risers and line ends. 36 named substations in the state are in GRANNIS's 69–114 kV band (21% of named stations). 126 sit in a higher band. 17 named substations in Arkansas operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 161 kV.
Who owns the transmission lines at GRANNIS?
The 1 connected line listed above is owned by SOUTHWEST ARKANSAS ELECTRIC COOPERATIVE CORORATION. Line voltages range from 69 kV to 69 kV. Their combined recorded length is about 2.1 miles.
How do candidate sites near GRANNIS score?
The 8 highest-scoring candidate sites within about 25 miles range from 56 to 58 on the 0–100 DC Readiness scale. They fall in Sevier County, Howard County, Sevier, McCurtain County. The Arkansas average across 1,651 scored sites is 53.6. 758 of those Arkansas sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is GRANNIS substation?
GRANNIS 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 GRANNIS is below the national midpoint.
How many transmission lines connect to GRANNIS substation?
1 transmission line terminate at or pass through GRANNIS in the HIFLD line data. The connected lines listed here run at 69 kV. Together the listed lines cover about 2.1 miles.
Who owns GRANNIS substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at GRANNIS belong to SOUTHWEST ARKANSAS ELECTRIC COOPERATIVE CORORATION. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is GRANNIS substation located?
GRANNIS is in Arkansas at 34.2877, -94.3440. The datacenter candidate sites closest to it are in Sevier County, Howard County, Sevier.
Are there datacenter candidate sites near GRANNIS substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of GRANNIS. The highest-scoring is EC FFE Sevier County at 58/100. Across Arkansas, the average DC Readiness score is 53.6.
Other 69 kV substations in Arkansas
- STATE LINE· 4 lines
- BLOOMBURG M.P.· 3 lines
- DIERKS· 3 lines
- F.M. COCHRAN· 3 lines
- GREENLAND· 3 lines
- SOUTH TEXA.· 3 lines
- WALDRON· 3 lines
- ARCH SMITH· 2 lines
- All named substations in Arkansas· 174 stations
- Datacenter candidate sites in Arkansas· 1,651 sites
- Brownfield and retired plant sites in Arkansas
- 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, “GRANNIS substation, Arkansas”, https://gridcensus.com/substations/arkansas/grannis-9f7bb5dc (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 GRANNIS substation, Arkansas 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.