Substation-Adjacent Datacenter Sites
At a glance
Parcels sited next to existing transmission substations. Co-location with a substation is the single strongest speed-to-power signal — interconnection distance is measured in feet, not miles.
How do substation-adjacent sites compare with other site types?
Substation-Adjacent sites are the largest of 9 site types by count and the 2nd-highest of 9 by average DC Readiness. Their 57.4 average is above the 53.0 average across all 147,272 sites. The average interconnection-queue wait in their markets, 4.2 yrs, is the 4th-shortest of 9. The substation-adjacent category is strongest on power availability, averaging 57.5 against a national average of 37.4; its weakest factor is water, at 70.7 versus 72.3 nationally.
Where are substation-adjacent datacenter sites located?
The five states with the most are Texas (3,635, 9%), California (1,573, 4%), Florida (1,539, 4%), Georgia (1,530, 4%) and Oklahoma (1,344, 3%). Substation-Adjacent sites appear in 52 states. By grid region, SERC holds 22%, MISO holds 22% and WECC holds 16%.
Substation-Adjacent sites by state
- Texas3,635
- California1,573
- Florida1,539
- Georgia1,530
- Oklahoma1,344
- Washington1,343
- Minnesota1,270
- Kentucky1,261
- Wisconsin1,248
- Alabama1,164
- South Carolina1,124
- North Carolina1,087
- Indiana1,024
- Missouri1,002
- Colorado899
- Pennsylvania886
- Tennessee886
- New York844
- Oregon844
- Ohio835
- Montana815
- Illinois795
- Michigan768
- Iowa761
- Arkansas758
- Utah739
- Virginia733
- Kansas730
- Nebraska720
- Mississippi694
- Idaho646
- Louisiana615
- Arizona614
- South Dakota477
- North Dakota453
- New Mexico445
- Wyoming441
- West Virginia378
- Maryland314
- Massachusetts305
- Nevada250
- Connecticut171
- New Jersey160
- Maine134
- Alaska114
- New Hampshire83
- Vermont82
- PR78
- Delaware73
- Rhode Island58
- Hawaii57
- District of Columbia21
Average sub-score profile
Top 25 substation-adjacent datacenter sites
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| COLSTRIP | Substation-Adjacent | MT | Rosebud County | 500 kV | 1,000 MW | 1.1 yrs | 75.8 |
| WIDOWS CREEK 500KV | Substation-Adjacent | AL | Dade County | 500 kV | 1,000 MW | 3.9 yrs | 73.0 |
| PIN HOOK | Substation-Adjacent | TN | Davidson County | 500 kV | 1,000 MW | 3.9 yrs | 72.8 |
| K STREET | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 4.3 yrs | 72.4 |
| MYSTIC | Substation-Adjacent | MA | Suffolk County | 345 kV | 600 MW | 4.3 yrs | 72.4 |
| OAK CREEK STATION | Substation-Adjacent | WI | Milwaukee County | 345 kV | 600 MW | 4.3 yrs | 72.3 |
| RAINEY | Substation-Adjacent | NY | New York County | 345 kV | 600 MW | 4.3 yrs | 72.2 |
| CANE RUN | Substation-Adjacent | KY | Floyd County | 345 kV | 600 MW | 3.9 yrs | 72.2 |
| BULL RUN | Substation-Adjacent | TN | Anderson County | 500 kV | 1,000 MW | 3.9 yrs | 72.2 |
| RACCOON MOUNTAIN | Substation-Adjacent | TN | Hamilton County | 500 kV | 1,000 MW | 3.9 yrs | 72.0 |
| WILLOW GLEN (500KV) | Substation-Adjacent | LA | Ascension Parish | 500 kV | 1,000 MW | 4.3 yrs | 71.9 |
| AUTAUGAVILLE | Substation-Adjacent | AL | Autauga County | 500 kV | 1,000 MW | 3.9 yrs | 71.9 |
| JOHNSONVILLE | Substation-Adjacent | TN | Benton County | 500 kV | 1,000 MW | 3.9 yrs | 71.8 |
| FREEPORT | Substation-Adjacent | TN | DeSoto County | 500 kV | 1,000 MW | 3.9 yrs | 71.8 |
| BRIDGEPORT RESCO | Substation-Adjacent | CT | Greater Bridgeport Planning Region | 345 kV | 600 MW | 4.3 yrs | 71.7 |
| NEWPORT TIE | Substation-Adjacent | SC | York County | 500 kV | 1,000 MW | 3.9 yrs | 71.6 |
| VOLUNTEER | Substation-Adjacent | TN | Knox County | 500 kV | 1,000 MW | 3.9 yrs | 71.5 |
| MONTGOMERY | Substation-Adjacent | TN | Montgomery County | 500 kV | 1,000 MW | 3.9 yrs | 71.4 |
| WILSON | Substation-Adjacent | TN | Wilson County | 500 kV | 1,000 MW | 3.9 yrs | 71.4 |
| DAVIDSON | Substation-Adjacent | TN | Williamson County | 500 kV | 1,000 MW | 3.9 yrs | 71.3 |
| SAYREVILLE | Substation-Adjacent | NJ | Middlesex County | 500 kV | 1,000 MW | 2.7 yrs | 71.3 |
| SHAWNEE | Substation-Adjacent | KY | Massac County | 500 kV | 1,000 MW | 4.3 yrs | 71.3 |
| NORCROSS | Substation-Adjacent | GA | Gwinnett County | 500 kV | 1,000 MW | 5.8 yrs | 71.3 |
| SHELBY | Substation-Adjacent | TN | Tipton County | 500 kV | 1,000 MW | 3.9 yrs | 71.3 |
| CORDOVA | Substation-Adjacent | TN | Shelby County | 500 kV | 1,000 MW | 3.9 yrs | 71.2 |
What do the top-scoring substation-adjacent sites have in common?
The top 25 substation-adjacent sites score between 71.2 and 75.8. 11 are in Tennessee, 2 are in Alabama and 2 are in Massachusetts. Of the top 25 substation-adjacent sites, 25 have a recorded nearest-substation voltage, with a median of 500 kV; for 25 that substation is rated 230 kV or higher. Their counties have a median of 9 fixed fiber broadband providers in FCC data. The median distance to the nearest internet exchange facility is 11 km. The median interconnection-queue wait in their markets is 3.9 years. 1 of the 4 with a mapped FEMA flood zone sits in a high-risk (A or V) zone.
Substation-Adjacent site FAQ
What is a substation-adjacent datacenter site?
Parcels sited next to existing transmission substations. Co-location with a substation is the single strongest speed-to-power signal — interconnection distance is measured in feet, not miles.
How many substation-adjacent datacenter sites are there?
GridCensus catalogs 38,820 substation-adjacent candidate sites nationwide, averaging 57.4/100 DC Readiness — 26% of all scored sites.
Which state has the most substation-adjacent datacenter sites?
Texas leads with 3,635 substation-adjacent candidate sites, followed by California with 1,573.
What is the highest-scoring substation-adjacent datacenter site?
COLSTRIP in Rosebud County, Montana has the highest DC Readiness Score of any substation-adjacent site, at 75.8/100.
How long is the interconnection queue for substation-adjacent sites?
Substation-Adjacent candidate sites sit in markets with an average interconnection-queue wait of 4.2 yrs, the 4th-shortest of 9 site types.
Other datacenter site types
- Greenfield datacenter sites· 18,112 sites
- Industrial datacenter sites· 35,788 sites
- Former Mine datacenter sites· 26,205 sites
- Federal Excess datacenter sites· 17,528 sites
- Manufacturing datacenter sites· 7,657 sites
- Shovel-Ready datacenter sites· 2,365 sites
- Brownfield datacenter sites· 771 sites
- Military BRAC datacenter sites· 26 sites
By grid region
- SERC datacenter sites· 8,574 substation-adjacent
- MISO datacenter sites· 8,368 substation-adjacent
- WECC datacenter sites· 6,054 substation-adjacent
- SPP datacenter sites· 5,866 substation-adjacent
- PJM datacenter sites· 4,518 substation-adjacent
- ERCOT datacenter sites· 2,094 substation-adjacent
- CAISO datacenter sites· 1,420 substation-adjacent
- ISO-NE datacenter sites· 881 substation-adjacent
- NYISO datacenter sites· 791 substation-adjacent
Dataset updated . Screening estimates derived from public data sources.
About this data
Source: GridCensus composite of HIFLD transmission and substation data, EIA, FEMA National Risk Index, FCC broadband data, PeeringDB and ISO interconnection queues, as published November 12, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Substation-Adjacent datacenter candidate sites”, https://gridcensus.com/site-types/substation (data as of November 12, 2026).
Go deeper than the public screen
Every site and score for Substation-Adjacent sites 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.