THREE MILE ISLAND
SubstationPennsylvania
THREE MILE ISLAND is an electric transmission substation in Pennsylvania. It is classified as extra-high-voltage (500 kv) and connects 5 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 & operation
Operator not catalogued for this substation.
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of THREE MILE ISLAND, 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 | 3.8 yrs | 63.5 |
| OZ Lancaster | Greenfield | PA | Lancaster | — | — | 3.0 yrs | 61.5 |
| OZ Dauphin | Greenfield | PA | Dauphin | — | — | 3.0 yrs | 61.4 |
| UNKNOWN123854 | Substation-Adjacent | PA | Lebanon County | 230 kV | 300 MW | 3.8 yrs | 61.3 |
| UNKNOWN123853 | Substation-Adjacent | PA | Lebanon County | 230 kV | 300 MW | 3.8 yrs | 61.1 |
| SOUTH MANHEIM | Substation-Adjacent | PA | Lancaster County | 230 kV | 300 MW | 3.8 yrs | 61.1 |
| UNKNOWN124218 | Substation-Adjacent | PA | Cumberland County | 230 kV | 300 MW | 3.8 yrs | 61.1 |
| EC Dauphin Coal Area | Greenfield | PA | Dauphin | — | — | 3.0 yrs | 60.9 |
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
This page shows a public slice of the GridCensus dataset for THREE MILE ISLAND substation, Pennsylvania. Pro and Enterprise plans unlock the full 147,272-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.