BOROUGH OF MIDDLETOWN MILL STREET
SubstationPennsylvania
At a glance
BOROUGH OF MIDDLETOWN MILL STREET is an electric transmission substation in Pennsylvania. It is classified as unclassified and connects 0 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
No owner is recorded for the lines that connect here.
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of BOROUGH OF MIDDLETOWN MILL STREET, 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 |
|---|---|---|---|---|---|---|---|
| THREE MILE ISLAND | Substation-Adjacent | PA | York County | 500 kV | 1,000 MW | 3.6 yrs | 63.4 |
| UNKNOWN123854 | Substation-Adjacent | PA | Lebanon County | 230 kV | 300 MW | 3.6 yrs | 61.2 |
| SOUTH MANHEIM | Substation-Adjacent | PA | Lancaster County | 230 kV | 300 MW | 3.6 yrs | 61.1 |
| UNKNOWN124218 | Substation-Adjacent | PA | Cumberland County | 230 kV | 300 MW | 3.6 yrs | 61.1 |
| UNKNOWN123853 | Substation-Adjacent | PA | Lebanon County | 230 kV | 300 MW | 3.6 yrs | 61.0 |
| UNKNOWN123852 | Substation-Adjacent | PA | Lebanon County | 230 kV | 300 MW | 3.6 yrs | 60.7 |
| BRUNNER ISLAND | Substation-Adjacent | PA | York County | 230 kV | 300 MW | 3.6 yrs | 60.2 |
| UNKNOWN123405 | Substation-Adjacent | PA | Dauphin County | 230 kV | 300 MW | 3.6 yrs | 60.1 |
How do candidate sites near BOROUGH OF MIDDLETOWN MILL STREET score?
The 8 highest-scoring candidate sites within about 25 miles range from 60 to 63 on the 0–100 DC Readiness scale. They fall in York County, Lebanon County, Lancaster County, Cumberland County. 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
How many transmission lines connect to BOROUGH OF MIDDLETOWN MILL STREET substation?
0 transmission lines terminate at or pass through BOROUGH OF MIDDLETOWN MILL STREET in the HIFLD line data.
Where is BOROUGH OF MIDDLETOWN MILL STREET substation located?
BOROUGH OF MIDDLETOWN MILL STREET is in Pennsylvania at 40.1928, -76.7265. The datacenter candidate sites closest to it are in York County, Lebanon County, Lancaster County.
Are there datacenter candidate sites near BOROUGH OF MIDDLETOWN MILL STREET substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of BOROUGH OF MIDDLETOWN MILL STREET. The highest-scoring is THREE MILE ISLAND at 63/100. Across Pennsylvania, the average DC Readiness score is 51.8.
More in Pennsylvania
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, “BOROUGH OF MIDDLETOWN MILL STREET substation, Pennsylvania”, https://gridcensus.com/substations/pennsylvania/borough-of-middletown-mill-street-c01944af (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 BOROUGH OF MIDDLETOWN MILL STREET 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.