JEFFERSON
SubstationIllinois
JEFFERSON is an electric transmission substation in Illinois. It is classified as extra-high-voltage (765 kv+) and connects 1 transmission line. 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.
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #1478 | 765 kV | — | IN SERVICE | 110.7 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of JEFFERSON, 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 |
|---|---|---|---|---|---|---|---|
| JEFFERSON | Substation-Adjacent | IN | Spencer County | 765 kV | 1,000 MW | 4.6 yrs | 75.6 |
| ELMER SMITH | Substation-Adjacent | KY | Daviess County | 345 kV | 600 MW | 4.6 yrs | 74.2 |
| HE RAMSEY | Substation-Adjacent | IN | Dubois County | 345 kV | 600 MW | 4.6 yrs | 72.7 |
| DAVIESS COUNTY | Substation-Adjacent | KY | Daviess County | 345 kV | 600 MW | 4.6 yrs | 72.2 |
| DAVIESS COUNTY | Substation-Adjacent | KY | Daviess County | 345 kV | 600 MW | 3.6 yrs | 71.8 |
| DAVIESS COUNTY | Substation-Adjacent | KY | Hancock County | 345 kV | 600 MW | 3.0 yrs | 71.6 |
| UNKNOWN127569 | Substation-Adjacent | IN | Vanderburgh County | 138 kV | 100 MW | 4.6 yrs | 71.4 |
| UNKNOWN124037 | Substation-Adjacent | KY | Daviess County | 345 kV | 600 MW | 4.6 yrs | 70.8 |
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 JEFFERSON substation, Illinois. 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.