TAP139933
SubstationIndiana · INDIANA MICHIGAN POWER CO
At a glance
TAP139933 is an electric transmission substation in Indiana, on INDIANA MICHIGAN POWER CO's transmission network. It is classified as sub-transmission (138 kv) and connects 3 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 |
|---|---|---|---|---|
| #132347 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 2.0 mi |
| #138884 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 0.1 mi |
| #163135 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 12.9 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP139933, 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 |
|---|---|---|---|---|---|---|---|
| OLIVE | Substation-Adjacent | IN | St. Joseph County | 345 kV | 600 MW | 3.0 yrs | 70.9 |
| KENZIE CREEK | Substation-Adjacent | MI | Cass County | 345 kV | 600 MW | 2.2 yrs | 68.4 |
| COOK | Substation-Adjacent | MI | Berrien County | 765 kV | 1,000 MW | 2.2 yrs | 67.7 |
| DUMONT | Substation-Adjacent | IN | St. Joseph County | 765 kV | 1,000 MW | 3.0 yrs | 67.7 |
| JACKSON ROAD | Substation-Adjacent | IN | St. Joseph County | 345 kV | 600 MW | 3.0 yrs | 67.0 |
| TWIN BRANCH (345 KV) | Substation-Adjacent | IN | St. Joseph County | 345 kV | 600 MW | 3.0 yrs | 66.0 |
| UNKNOWN122727 | Substation-Adjacent | IN | LaPorte County | 345 kV | 600 MW | 3.0 yrs | 65.3 |
| OZ St. Joseph | Greenfield | IN | St. Joseph | — | — | 3.0 yrs | 64.0 |
Who owns the transmission lines at TAP139933?
The 3 connected lines listed above are owned by INDIANA MICHIGAN POWER CO. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 15.1 miles.
How do candidate sites near TAP139933 score?
The 8 highest-scoring candidate sites within about 25 miles range from 64 to 71 on the 0–100 DC Readiness scale. They fall in St. Joseph County, Cass County, Berrien County, LaPorte County. The Indiana average across 8,629 scored sites is 54. 1,024 of those Indiana sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is TAP139933 substation?
TAP139933 has a maximum voltage of 138 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so TAP139933 is above the national midpoint.
How many transmission lines connect to TAP139933 substation?
3 transmission lines terminate at or pass through TAP139933 in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 15.1 miles.
Who owns TAP139933 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP139933 belong to INDIANA MICHIGAN POWER CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP139933 substation located?
TAP139933 is in Indiana at 41.7235, -86.5094. The datacenter candidate sites closest to it are in St. Joseph County, Cass County, Berrien County.
Are there datacenter candidate sites near TAP139933 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP139933. The highest-scoring is OLIVE at 71/100. Across Indiana, the average DC Readiness score is 54.
More in Indiana
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, “TAP139933 substation, Indiana”, https://gridcensus.com/substations/indiana/tap139933-28892d33 (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 TAP139933 substation, Indiana 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.