GRAN GRAE
SubstationIowa · NORTHERN STATES POWER CO
GRAN GRAE is an electric transmission substation in Iowa, operated by NORTHERN STATES POWER 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
Ownership & operation
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #29059 | 161 kV | NORTHERN STATES POWER CO - WISCONSIN | IN SERVICE | 24.3 mi |
| #45759 | 161 kV | NORTHERN STATES POWER CO | IN SERVICE | 15.9 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of GRAN GRAE, 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 |
|---|---|---|---|---|---|---|---|
| LANSING | Substation-Adjacent | IA | Allamakee County | 161 kV | 100 MW | 1.4 yrs | 69.4 |
| LANCASTER | Substation-Adjacent | WI | Grant County | 138 kV | 100 MW | 1.4 yrs | 67.6 |
| DPC BELL CENTER | Substation-Adjacent | WI | Crawford County | 161 kV | 100 MW | 1.4 yrs | 67.5 |
| UNKNOWN107663 | Substation-Adjacent | WI | Crawford County | 161 kV | 100 MW | 1.4 yrs | 67.0 |
| GENOA | Substation-Adjacent | MN | Houston County | 161 kV | 100 MW | 1.4 yrs | 65.6 |
| Genoa | Brownfield | MN | Houston County | — | 346 MW | 1.4 yrs | 63.3 |
| Greenfield (NELSON DEWEY SW YD - GRAN GRAE) | Greenfield | WI | Grant County | 161 kV | 100 MW | 1.4 yrs | 63.2 |
| Greenfield (DPC BELL CENTER - UNKNOWN15904) | Greenfield | WI | Vernon County | 161 kV | 100 MW | 1.4 yrs | 63.2 |
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 GRAN GRAE substation, Iowa. 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.