JOHNSON
SubstationTexas · ONCOR ELECTRIC DELIVERY CO.
At a glance
JOHNSON is an electric transmission substation in Texas, on ONCOR ELECTRIC DELIVERY CO.'s transmission network. It is classified as high-voltage (345 kv) and connects 3 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #306691 | 345 kV | ONCOR ELECTRIC DELIVERY CO. | IN SERVICE | 25.1 mi |
| #308113 | 345 kV | ONCOR ELECTRIC DELIVERY CO. | IN SERVICE | 22.0 mi |
| #312823 | 345 kV | ONCOR ELECTRIC DELIVERY CO. | IN SERVICE | 0.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of JOHNSON, 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 |
|---|---|---|---|---|---|---|---|
| EVERMAN | Substation-Adjacent | TX | Tarrant County | 345 kV | 600 MW | 3.5 yrs | 68.4 |
| UNKNOWN304568 | Substation-Adjacent | TX | Tarrant County | 345 kV | 600 MW | 3.5 yrs | 68.4 |
| BENBROOK | Substation-Adjacent | TX | Tarrant County | 345 kV | 600 MW | 3.5 yrs | 68.4 |
| UNKNOWN302319 | Substation-Adjacent | TX | Tarrant County | 345 kV | 600 MW | 3.5 yrs | 68.3 |
| UNKNOWN301121 | Substation-Adjacent | TX | Tarrant County | 345 kV | 600 MW | 3.5 yrs | 68.0 |
| EC FFE Tarrant County | Greenfield | TX | Tarrant County | — | — | 3.5 yrs | 67.7 |
| UNKNOWN304324 | Substation-Adjacent | TX | Tarrant County | 345 kV | 600 MW | 3.5 yrs | 67.6 |
| OZ Tarrant | Greenfield | TX | Tarrant | — | — | 3.5 yrs | 67.4 |
How does JOHNSON compare with other substations in Texas?
Texas has 4,939 substation records in HIFLD, of which 1,426 carry a station name; the rest are unnamed tap points, risers and line ends. 198 named substations in the state are in JOHNSON's 345–499 kV band (14% of named stations). 2 sit in a higher band. 200 named substations in Texas 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 JOHNSON?
The 3 connected lines listed above are owned by ONCOR ELECTRIC DELIVERY CO. Line voltages range from 345 kV to 345 kV. Their combined recorded length is about 47.3 miles.
How do candidate sites near JOHNSON score?
The 8 highest-scoring candidate sites within about 25 miles range from 67 to 68 on the 0–100 DC Readiness scale. They fall in Tarrant County, Tarrant. The Texas average across 6,839 scored sites is 56.4. 3,635 of those Texas sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is JOHNSON substation?
JOHNSON has a maximum voltage of 345 kV and a minimum of 69 kV. That places it in the 345–499 kV band. The median named US substation in this dataset is 115 kV, so JOHNSON is above the national midpoint.
How many transmission lines connect to JOHNSON substation?
3 transmission lines terminate at or pass through JOHNSON in the HIFLD line data. The connected lines listed here run at 345 kV. Together the listed lines cover about 47.3 miles.
Who owns JOHNSON substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at JOHNSON belong to ONCOR ELECTRIC DELIVERY CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is JOHNSON substation located?
JOHNSON is in Texas at 32.3950, -97.4855. The datacenter candidate sites closest to it are in Tarrant County, Tarrant.
Are there datacenter candidate sites near JOHNSON substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of JOHNSON. The highest-scoring is EVERMAN at 68/100. Across Texas, the average DC Readiness score is 56.4.
Other 345 kV substations in Texas
- GREENS BAYOU 345· 21 lines
- ROYSE· 17 lines
- CEDAR BAYOU PLANT· 16 lines
- PH ROBINSON· 16 lines
- VENUS· 16 lines
- SKYLINE· 15 lines
- SOTEX5· 15 lines
- PARISH· 14 lines
- All named substations in Texas· 1,426 stations
- Datacenter candidate sites in Texas· 6,839 sites
- Brownfield and retired plant sites in Texas
- 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, “JOHNSON substation, Texas”, https://gridcensus.com/substations/texas/johnson-50b5f643 (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 JOHNSON substation, Texas 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.