THAYER
SubstationIllinois · NORTHERN INDIANA PUB SERV CO
THAYER is an electric transmission substation in Illinois, operated by NORTHERN INDIANA PUB SERV CO. It is classified as sub-transmission (138 kv) and connects 2 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 |
|---|---|---|---|---|
| #15067 | 138 kV | NORTHERN INDIANA PUB SERV CO | IN SERVICE | 16.0 mi |
| #43674 | 138 kV | NORTHERN INDIANA PUB SERV CO | IN SERVICE | 14.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of THAYER, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN122743 | Substation-Adjacent | IN | Lake County | 345 kV | 600 MW | 4.6 yrs | 74.4 |
| TAP138162 | Substation-Adjacent | IN | Lake County | 345 kV | 600 MW | 4.6 yrs | 74.4 |
| MUNSTER | Substation-Adjacent | IN | Lake County | 345 kV | 600 MW | 4.6 yrs | 74.3 |
| UNKNOWN121993 | Substation-Adjacent | IN | Lake County | 345 kV | 600 MW | 4.6 yrs | 74.2 |
| TOWER ROAD | Substation-Adjacent | IN | Porter County | 345 kV | 600 MW | 4.6 yrs | 73.6 |
| WILTON | Substation-Adjacent | IN | Porter County | 765 kV | 1,000 MW | 4.6 yrs | 73.2 |
| TAP138156 | Substation-Adjacent | IN | Lake County | 345 kV | 600 MW | 4.6 yrs | 73.2 |
| UNKNOWN122738 | Substation-Adjacent | IN | Lake County | 345 kV | 600 MW | 2.2 yrs | 72.7 |
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 THAYER 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.