SHEFFIELD
SubstationIllinois · NORTHERN INDIANA PUB SERV CO
SHEFFIELD is an electric transmission substation in Illinois, operated by NORTHERN INDIANA PUB SERV CO. It is classified as high-voltage (345 kv) and connects 6 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 |
|---|---|---|---|---|
| #119 | 345 kV | NORTHERN INDIANA PUB SERV CO | IN SERVICE | 2.8 mi |
| #4485 | 345 kV | — | IN SERVICE | 5.8 mi |
| #14925 | 138 kV | NORTHERN INDIANA PUB SERV CO | IN SERVICE | 0.6 mi |
| #14929 | 138 kV | NORTHERN INDIANA PUB SERV CO | IN SERVICE | 1.6 mi |
| #14931 | 138 kV | NORTHERN INDIANA PUB SERV CO | IN SERVICE | 2.4 mi |
| #14932 | 138 kV | NORTHERN INDIANA PUB SERV CO | IN SERVICE | 2.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of SHEFFIELD, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN124436 | Substation-Adjacent | IL | Cook County | 345 kV | 600 MW | 2.2 yrs | 78.0 |
| SHEFFIELD | Substation-Adjacent | IN | Lake County | 345 kV | 600 MW | 2.2 yrs | 76.9 |
| UNKNOWN122269 | Substation-Adjacent | IL | Cook County | 345 kV | 600 MW | 2.2 yrs | 76.8 |
| TAP160103 | Substation-Adjacent | IL | Cook County | 345 kV | 600 MW | 2.2 yrs | 76.6 |
| UNKNOWN122289 | Substation-Adjacent | IL | DuPage County | 345 kV | 600 MW | 2.2 yrs | 76.1 |
| BLUE ISLAND | Substation-Adjacent | IN | Lake County | 345 kV | 600 MW | 4.6 yrs | 75.9 |
| BURNHAM | Substation-Adjacent | IL | Cook County | 345 kV | 600 MW | 2.2 yrs | 75.8 |
| Crawford | Brownfield | IL | Cook | — | 805 MW | — | 75.6 |
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 SHEFFIELD 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.