TAP137993
SubstationIowa · MIDAMERICAN ENERGY CO
At a glance
TAP137993 is an electric transmission substation in Iowa, on MIDAMERICAN ENERGY CO's transmission network. It is classified as unclassified 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 |
|---|---|---|---|---|
| #110916 | — | MIDAMERICAN ENERGY CO | — | 0.1 mi |
| #127586 | — | MIDAMERICAN ENERGY CO | IN SERVICE | 2.4 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP137993, 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 |
|---|---|---|---|---|---|---|---|
| TIFFIN | Substation-Adjacent | IA | Johnson County | 345 kV | 600 MW | 4.3 yrs | 68.2 |
| Alliant SBD 9302 Aegon NP | Brownfield | IA | Linn | — | 1 MW | 4.3 yrs | 67.2 |
| ARNOLD | Substation-Adjacent | IA | Linn County | 345 kV | 600 MW | 4.3 yrs | 67.1 |
| EC Near University of Iowa Main Power Plant | Greenfield | IA | Johnson | — | — | 4.3 yrs | 65.9 |
| UNKNOWN159106 | Substation-Adjacent | IA | Johnson County | 161 kV | 100 MW | 4.3 yrs | 63.7 |
| RISER137658 | Substation-Adjacent | IA | Johnson County | 161 kV | 100 MW | 4.3 yrs | 63.7 |
| UNKNOWN137654 | Substation-Adjacent | IA | Johnson County | 161 kV | 100 MW | 4.3 yrs | 63.7 |
| EC Coal Linn County | Greenfield | IA | Linn County | — | — | 4.3 yrs | 63.6 |
Who owns the transmission lines at TAP137993?
The 2 connected lines listed above are owned by MIDAMERICAN ENERGY CO. Their combined recorded length is about 2.5 miles.
How do candidate sites near TAP137993 score?
The 8 highest-scoring candidate sites within about 25 miles range from 64 to 68 on the 0–100 DC Readiness scale. They fall in Johnson County, Linn, Linn County, Johnson. 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
How many transmission lines connect to TAP137993 substation?
2 transmission lines terminate at or pass through TAP137993 in the HIFLD line data. Together the listed lines cover about 2.5 miles.
Who owns TAP137993 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP137993 belong to MIDAMERICAN ENERGY CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP137993 substation located?
TAP137993 is in Iowa at 42.0442, -91.6996. The datacenter candidate sites closest to it are in Johnson County, Linn, Linn County.
Are there datacenter candidate sites near TAP137993 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP137993. The highest-scoring is TIFFIN at 68/100. 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, “TAP137993 substation, Iowa”, https://gridcensus.com/substations/iowa/tap137993-317bdac3 (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 TAP137993 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.