EARLHAM
SubstationIowa · MIDAMERICAN ENERGY CO
EARLHAM is an electric transmission substation in Iowa, operated by MIDAMERICAN ENERGY 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 |
|---|---|---|---|---|
| #12202 | 161 kV | MIDAMERICAN ENERGY CO | IN SERVICE | 14.3 mi |
| #12237 | 161 kV | — | IN SERVICE | 22.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of EARLHAM, 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 |
|---|---|---|---|---|---|---|---|
| SYCAMORE | Substation-Adjacent | IA | Polk County | 345 kV | 600 MW | 1.4 yrs | 78.0 |
| NORWALK | Substation-Adjacent | IA | Warren County | 345 kV | 600 MW | 1.4 yrs | 75.2 |
| BOONEVILLE | Substation-Adjacent | IA | Madison County | 345 kV | 600 MW | 1.4 yrs | 74.8 |
| UNKNOWN131356 | Substation-Adjacent | IA | Polk County | 161 kV | 100 MW | 1.4 yrs | 74.3 |
| UNKNOWN137711 | Substation-Adjacent | IA | Dallas County | 161 kV | 100 MW | 1.4 yrs | 74.2 |
| UNKNOWN173441 | Substation-Adjacent | IA | Boone County | 345 kV | 600 MW | 1.4 yrs | 74.1 |
| UNKNOWN132137 | Substation-Adjacent | IA | Polk County | 161 kV | 100 MW | 1.4 yrs | 74.1 |
| UNKNOWN132139 | Substation-Adjacent | IA | Polk County | 161 kV | 100 MW | 1.4 yrs | 74.0 |
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 EARLHAM 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.