CONOWINGO
SubstationMaryland · DELMARVA POWER
CONOWINGO is an electric transmission substation in Maryland, operated by DELMARVA POWER. It is classified as high-voltage (230 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #30386 | 230 kV | DELMARVA POWER | — | 0.1 mi |
| #40165 | 230 kV | DELMARVA POWER | IN SERVICE | 3.5 mi |
| #42789 | 230 kV | DELMARVA POWER | IN SERVICE | 3.4 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of CONOWINGO, 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 |
|---|---|---|---|---|---|---|---|
| CONASTONE | Substation-Adjacent | MD | Harford County | 500 kV | 1,000 MW | 3.0 yrs | 77.2 |
| ROCK SPRINGS | Substation-Adjacent | MD | Harford County | 500 kV | 1,000 MW | 3.0 yrs | 76.5 |
| ROCK SPRINGS | Substation-Adjacent | MD | Harford County | 500 kV | 1,000 MW | 3.5 yrs | 76.0 |
| DELTA YORK EC | Substation-Adjacent | MD | Harford County | 500 kV | 1,000 MW | 3.0 yrs | 74.5 |
| TAP161305 | Substation-Adjacent | MD | Harford County | 230 kV | 300 MW | 3.1 yrs | 74.5 |
| CLAY | Substation-Adjacent | PA | Chester County | 230 kV | 300 MW | 3.0 yrs | 74.3 |
| Greenfield (ROCK SPRINGS - KEENEY) | Greenfield | MD | Cecil County | 500 kV | 1,000 MW | 1.5 yrs | 74.1 |
| PEACH BOTTOM | Substation-Adjacent | MD | Harford County | 500 kV | 1,000 MW | 3.0 yrs | 74.0 |
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 CONOWINGO substation, Maryland. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.