TAP139139
SubstationMaryland · BALTIMORE GAS & ELECTRIC CO
At a glance
TAP139139 is an electric transmission substation in Maryland, on BALTIMORE GAS & ELECTRIC CO's transmission network. It is classified as sub-transmission (115 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
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 |
|---|---|---|---|---|
| #133191 | 115 kV | BALTIMORE GAS & ELECTRIC CO | IN SERVICE | 4.3 mi |
| #150439 | 115 kV | BALTIMORE GAS & ELECTRIC CO | IN SERVICE | 0.0 mi |
| #172688 | 115 kV | BALTIMORE GAS & ELECTRIC CO | IN SERVICE | 0.6 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP139139, 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 |
|---|---|---|---|---|---|---|---|
| ROCK SPRINGS | Substation-Adjacent | MD | Harford County | 500 kV | 1,000 MW | 5.3 yrs | 68.8 |
| WAUGH CHAPEL | Substation-Adjacent | MD | Anne Arundel County | 500 kV | 1,000 MW | 5.3 yrs | 67.5 |
| DELTA YORK EC | Substation-Adjacent | PA | Harford County | 500 kV | 1,000 MW | 3.6 yrs | 65.8 |
| UNKNOWN123195 | Substation-Adjacent | MD | Baltimore city | 230 kV | 300 MW | 5.3 yrs | 64.9 |
| CONASTONE | Substation-Adjacent | MD | Harford County | 500 kV | 1,000 MW | 5.3 yrs | 64.7 |
| BRANDON SHORES | Substation-Adjacent | MD | Baltimore city | 230 kV | 300 MW | 5.3 yrs | 64.1 |
| PEACH BOTTOM | Substation-Adjacent | PA | Harford County | 500 kV | 1,000 MW | 3.6 yrs | 64.0 |
| PEACH BOTTOM | Substation-Adjacent | PA | Harford County | 500 kV | 1,000 MW | 3.6 yrs | 64.0 |
Who owns the transmission lines at TAP139139?
The 3 connected lines listed above are owned by BALTIMORE GAS & ELECTRIC CO. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 4.9 miles.
How do candidate sites near TAP139139 score?
The 8 highest-scoring candidate sites within about 25 miles range from 64 to 69 on the 0–100 DC Readiness scale. They fall in Harford County, Anne Arundel County, Baltimore city. 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 TAP139139 substation?
TAP139139 has a maximum voltage of 115 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so TAP139139 is at the national midpoint.
How many transmission lines connect to TAP139139 substation?
3 transmission lines terminate at or pass through TAP139139 in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 4.9 miles.
Who owns TAP139139 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP139139 belong to BALTIMORE GAS & ELECTRIC CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP139139 substation located?
TAP139139 is in Maryland at 39.3778, -76.4445. The datacenter candidate sites closest to it are in Harford County, Anne Arundel County, Baltimore city.
Are there datacenter candidate sites near TAP139139 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP139139. The highest-scoring is ROCK SPRINGS at 69/100. 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, “TAP139139 substation, Maryland”, https://gridcensus.com/substations/maryland/tap139139-17c48e36 (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 TAP139139 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.