TAP139270
SubstationWest Virginia · THE POTOMAC EDISON CO
At a glance
TAP139270 is an electric transmission substation in West Virginia, on THE POTOMAC EDISON CO's transmission network. It is classified as sub-transmission (138 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 |
|---|---|---|---|---|
| #104223 | 138 kV | THE POTOMAC EDISON CO | IN SERVICE | 0.9 mi |
| #115328 | 138 kV | THE POTOMAC EDISON CO | IN SERVICE | 2.8 mi |
| #127455 | 138 kV | THE POTOMAC EDISON CO | IN SERVICE | 6.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP139270, 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 |
|---|---|---|---|---|---|---|---|
| GREENLAND GAP | Substation-Adjacent | WV | Grant County | 500 kV | 1,000 MW | 3.0 yrs | 64.9 |
| MOUNT STORM | Substation-Adjacent | WV | Grant County | 500 kV | 1,000 MW | 3.0 yrs | 64.9 |
| UNKNOWN162360 | Substation-Adjacent | WV | Grant County | 500 kV | 1,000 MW | 3.0 yrs | 64.6 |
| BLACK OAK | Substation-Adjacent | MD | Mineral County | 500 kV | 1,000 MW | 5.3 yrs | 61.2 |
| AES Warrior Run Cogeneration Facility | Brownfield | MD | Allegany County | — | 229 MW | 5.3 yrs | 60.8 |
| Greenfield (MOUNT STORM - MEADOW BROOK) | Greenfield | WV | Hardy County | 500 kV | 1,000 MW | 3.0 yrs | 60.3 |
| North Branch (WV) | Brownfield | WV | Grant County | — | 80 MW | 3.0 yrs | 59.4 |
| EC Near North Branch (WV) | Greenfield | WV | Grant | — | — | 3.0 yrs | 58.9 |
Who owns the transmission lines at TAP139270?
The 3 connected lines listed above are owned by THE POTOMAC EDISON CO. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 10.2 miles.
How do candidate sites near TAP139270 score?
The 8 highest-scoring candidate sites within about 25 miles range from 59 to 65 on the 0–100 DC Readiness scale. They fall in Grant County, Mineral County, Allegany County, Hardy County. The West Virginia average across 3,734 scored sites is 52. 378 of those West Virginia sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is TAP139270 substation?
TAP139270 has a maximum voltage of 138 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so TAP139270 is above the national midpoint.
How many transmission lines connect to TAP139270 substation?
3 transmission lines terminate at or pass through TAP139270 in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 10.2 miles.
Who owns TAP139270 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP139270 belong to THE POTOMAC EDISON CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP139270 substation located?
TAP139270 is in West Virginia at 39.4354, -79.0553. The datacenter candidate sites closest to it are in Grant County, Mineral County, Allegany County.
Are there datacenter candidate sites near TAP139270 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP139270. The highest-scoring is GREENLAND GAP at 65/100. Across West Virginia, the average DC Readiness score is 52.
More in West Virginia
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, “TAP139270 substation, West Virginia”, https://gridcensus.com/substations/west-virginia/tap139270-1ef848b8 (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 TAP139270 substation, West Virginia 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.