RISER137758
SubstationIowa · MIDAMERICAN ENERGY CO
At a glance
RISER137758 is an electric transmission substation in Iowa, on MIDAMERICAN ENERGY CO's transmission network. It is classified as distribution (69–115 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 |
|---|---|---|---|---|
| #105870 | 69 kV | MIDAMERICAN ENERGY CO | — | 0.2 mi |
| #175944 | 69 kV | MIDAMERICAN ENERGY CO | IN SERVICE | 9.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of RISER137758, 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 |
|---|---|---|---|---|---|---|---|
| OZ Page | Greenfield | IA | Page | — | — | 4.3 yrs | 61.7 |
| EC Coal Pottawattamie County | Greenfield | IA | Pottawattamie County | — | — | 4.3 yrs | 61.1 |
| UNKNOWN131421 | Substation-Adjacent | IA | Mills County | 161 kV | 100 MW | 4.3 yrs | 60.0 |
| OZ Cass | Greenfield | IA | Cass | — | — | 4.3 yrs | 59.2 |
| EC Near Atlantic | Greenfield | IA | Cass | — | — | 4.3 yrs | 58.7 |
| EC Near Atlantic | Greenfield | IA | Cass | — | — | 4.3 yrs | 58.5 |
| EC Near Atlantic | Greenfield | IA | Cass | — | — | 4.3 yrs | 58.2 |
| EC Near Atlantic | Greenfield | IA | Cass | — | — | 4.3 yrs | 58.2 |
Who owns the transmission lines at RISER137758?
The 2 connected lines listed above are owned by MIDAMERICAN ENERGY CO. Line voltages range from 69 kV to 69 kV. Their combined recorded length is about 9.7 miles.
How do candidate sites near RISER137758 score?
The 8 highest-scoring candidate sites within about 25 miles range from 58 to 62 on the 0–100 DC Readiness scale. They fall in Page, Pottawattamie County, Mills County, Cass. The Iowa average across 2,572 scored sites is 56.4. 761 of those Iowa sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is RISER137758 substation?
RISER137758 has a maximum voltage of 69 kV. That places it in the 69–114 kV band. The median named US substation in this dataset is 115 kV, so RISER137758 is below the national midpoint.
How many transmission lines connect to RISER137758 substation?
2 transmission lines terminate at or pass through RISER137758 in the HIFLD line data. The connected lines listed here run at 69 kV. Together the listed lines cover about 9.7 miles.
Who owns RISER137758 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at RISER137758 belong to MIDAMERICAN ENERGY CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is RISER137758 substation located?
RISER137758 is in Iowa at 41.0100, -95.2315. The datacenter candidate sites closest to it are in Page, Pottawattamie County, Mills County.
Are there datacenter candidate sites near RISER137758 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of RISER137758. The highest-scoring is OZ Page at 62/100. Across Iowa, the average DC Readiness score is 56.4.
More in Iowa
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “RISER137758 substation, Iowa”, https://gridcensus.com/substations/iowa/riser137758-16d64564 (data as of June 29, 2026).
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
Every site and score for RISER137758 substation, Iowa is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.