3 MILE KNOLL
SubstationUtah · IDAHO POWER CO
3 MILE KNOLL is an electric transmission substation in Utah, operated by IDAHO POWER CO. It is classified as high-voltage (345 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #67262 | 345 kV | IDAHO POWER CO | — | 174.2 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of 3 MILE KNOLL, 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 |
|---|---|---|---|---|---|---|---|
| 3 MILE KNOLL | Substation-Adjacent | ID | Caribou County | 345 kV | 600 MW | 2.0 yrs | 70.4 |
| TAP204771 | Substation-Adjacent | ID | Caribou County | 230 kV | 300 MW | 2.0 yrs | 69.1 |
| GRACE | Substation-Adjacent | ID | Caribou County | 230 kV | 300 MW | 2.0 yrs | 68.1 |
| Greenfield (3 MILE KNOLL - JIM BRIDGER) | Greenfield | ID | Bear Lake County | 345 kV | 600 MW | 1.7 yrs | 67.8 |
| TAP204786 | Substation-Adjacent | ID | Bannock County | 138 kV | 100 MW | 2.0 yrs | 67.7 |
| Greenfield (POPULUS - JIM BRIDGER) | Greenfield | ID | Bear Lake County | 345 kV | 600 MW | 1.7 yrs | 65.7 |
| UNKNOWN202624 | Substation-Adjacent | ID | Bannock County | 138 kV | 100 MW | 2.0 yrs | 65.7 |
| UNKNOWN202623 | Substation-Adjacent | ID | Bannock County | 115 kV | 100 MW | 2.0 yrs | 65.5 |
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 3 MILE KNOLL substation, Utah. 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.