UPPER DARBY
SubstationPennsylvania · PECO ENERGY CO
At a glance
UPPER DARBY is an electric transmission substation in Pennsylvania, on PECO ENERGY CO's transmission network. It is classified as distribution (69–115 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 |
|---|---|---|---|---|
| #125672 | 69 kV | PECO ENERGY CO | IN SERVICE | 2.4 mi |
| #139422 | 69 kV | PECO ENERGY CO | IN SERVICE | 0.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of UPPER DARBY, 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 |
|---|---|---|---|---|---|---|---|
| RED LION | Substation-Adjacent | DE | New Castle County | 500 kV | 1,000 MW | 1.5 yrs | 70.6 |
| CROMBY | Substation-Adjacent | PA | Montgomery County | 230 kV | 300 MW | 3.6 yrs | 69.8 |
| EDDYSTONE | Substation-Adjacent | PA | Delaware County | 230 kV | 300 MW | 3.6 yrs | 69.0 |
| UNKNOWN130225 | Substation-Adjacent | DE | Delaware County | 230 kV | 300 MW | 1.5 yrs | 68.8 |
| WHITPAIN | Substation-Adjacent | PA | Montgomery County | 500 kV | 1,000 MW | 3.6 yrs | 68.6 |
| LIMERICK (500KV SUB) | Substation-Adjacent | PA | Montgomery County | 500 kV | 1,000 MW | 3.6 yrs | 68.5 |
| DuPont Newport | Brownfield | DE | New Castle | — | 1 MW | 1.5 yrs | 68.4 |
| CENTERPOINT | Substation-Adjacent | PA | Montgomery County | 500 kV | 1,000 MW | 3.6 yrs | 68.3 |
How does UPPER DARBY compare with other substations in Pennsylvania?
Pennsylvania has 2,109 substation records in HIFLD, of which 251 carry a station name; the rest are unnamed tap points, risers and line ends. 14 named substations in the state are in UPPER DARBY's 69–114 kV band (6% of named stations). 214 sit in a higher band. 37 named substations in Pennsylvania operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 230 kV.
Who owns the transmission lines at UPPER DARBY?
The 2 connected lines listed above are owned by PECO ENERGY CO. Line voltages range from 69 kV to 69 kV. Their combined recorded length is about 2.5 miles.
How do candidate sites near UPPER DARBY score?
The 8 highest-scoring candidate sites within about 25 miles range from 68 to 71 on the 0–100 DC Readiness scale. They fall in New Castle County, Montgomery County, Delaware County, New Castle. The Pennsylvania average across 6,497 scored sites is 51.8. 886 of those Pennsylvania sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is UPPER DARBY substation?
UPPER DARBY has a maximum voltage of 69 kV. That places it in the 69–114 kV band. The median named US substation in this dataset is 115 kV, so UPPER DARBY is below the national midpoint.
How many transmission lines connect to UPPER DARBY substation?
2 transmission lines terminate at or pass through UPPER DARBY in the HIFLD line data. The connected lines listed here run at 69 kV. Together the listed lines cover about 2.5 miles.
Who owns UPPER DARBY substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at UPPER DARBY belong to PECO ENERGY CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is UPPER DARBY substation located?
UPPER DARBY is in Pennsylvania at 39.9508, -75.2638. The datacenter candidate sites closest to it are in New Castle County, Montgomery County, Delaware County.
Are there datacenter candidate sites near UPPER DARBY substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of UPPER DARBY. The highest-scoring is RED LION at 71/100. Across Pennsylvania, the average DC Readiness score is 51.8.
Other 69 kV substations in Pennsylvania
- SCHUYLKILL· 6 lines
- SOUTHWARK· 5 lines
- LANDSVILLE· 4 lines
- DELAWARE· 3 lines
- FULLER TAP· 3 lines
- ANGORA· 2 lines
- BURHOLME· 2 lines
- DLUZERNE· 2 lines
- All named substations in Pennsylvania· 251 stations
- Datacenter candidate sites in Pennsylvania· 6,497 sites
- Brownfield and retired plant sites in Pennsylvania
- 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, “UPPER DARBY substation, Pennsylvania”, https://gridcensus.com/substations/pennsylvania/upper-darby-dd953819 (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 UPPER DARBY substation, Pennsylvania 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.