TAP139268
SubstationMaryland · ALLEGHENY POWER SYSTEMS
At a glance
TAP139268 is an electric transmission substation in Maryland, on ALLEGHENY POWER SYSTEMS's transmission network. It is classified as sub-transmission (138 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #113636 | 138 kV | ALLEGHENY POWER SYSTEMS | IN SERVICE | 0.1 mi |
| #130856 | 138 kV | ALLEGHENY POWER SYSTEMS | IN SERVICE | 1.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP139268, 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 |
|---|---|---|---|---|---|---|---|
| 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 |
| UNKNOWN108968 | Substation-Adjacent | WV | Hampshire County | 138 kV | 100 MW | 3.0 yrs | 58.3 |
| EC Coal Mineral County | Greenfield | WV | Mineral County | — | — | 3.0 yrs | 57.8 |
| EC Coal Somerset County | Greenfield | PA | Somerset County | — | — | 3.6 yrs | 56.9 |
| EC Coal Hampshire County | Greenfield | WV | Hampshire County | — | — | 3.0 yrs | 56.9 |
| EC Coal Mineral County | Greenfield | WV | Mineral County | — | — | 3.0 yrs | 56.8 |
| UNKNOWN133900 | Substation-Adjacent | WV | Allegany County | 138 kV | 100 MW | 3.0 yrs | 56.7 |
Who owns the transmission lines at TAP139268?
The 2 connected lines listed above are owned by ALLEGHENY POWER SYSTEMS. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 1.3 miles.
How do candidate sites near TAP139268 score?
The 8 highest-scoring candidate sites within about 25 miles range from 57 to 61 on the 0–100 DC Readiness scale. They fall in Mineral County, Allegany County, Hampshire County, Somerset County. The Maryland average across 1,031 scored sites is 52.9. 314 of those Maryland sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is TAP139268 substation?
TAP139268 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 TAP139268 is above the national midpoint.
How many transmission lines connect to TAP139268 substation?
2 transmission lines terminate at or pass through TAP139268 in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 1.3 miles.
Who owns TAP139268 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP139268 belong to ALLEGHENY POWER SYSTEMS. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP139268 substation located?
TAP139268 is in Maryland at 39.6691, -78.9028. The datacenter candidate sites closest to it are in Mineral County, Allegany County, Hampshire County.
Are there datacenter candidate sites near TAP139268 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP139268. The highest-scoring is BLACK OAK at 61/100. Across Maryland, the average DC Readiness score is 52.9.
More in Maryland
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, “TAP139268 substation, Maryland”, https://gridcensus.com/substations/maryland/tap139268-008944e9 (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 TAP139268 substation, Maryland 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.