TAP139966
SubstationMichigan · INDIANA MICHIGAN POWER CO
At a glance
TAP139966 is an electric transmission substation in Michigan, on INDIANA MICHIGAN POWER CO's transmission network. It is classified as unclassified 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 |
|---|---|---|---|---|
| #131954 | — | INDIANA MICHIGAN POWER CO | IN SERVICE | 0.1 mi |
| #132603 | — | INDIANA MICHIGAN POWER CO | IN SERVICE | 0.8 mi |
| #143577 | — | INDIANA MICHIGAN POWER CO | IN SERVICE | 2.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP139966, 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 |
|---|---|---|---|---|---|---|---|
| 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 |
| BENTON HARBOR | Substation-Adjacent | MI | Van Buren County | 345 kV | 600 MW | 2.2 yrs | 66.1 |
| UNKNOWN173428 | Substation-Adjacent | MI | Van Buren County | 345 kV | 600 MW | 2.2 yrs | 64.8 |
| PALISADES | Substation-Adjacent | MI | Van Buren County | 345 kV | 600 MW | 2.2 yrs | 64.7 |
| TAP145860 | Substation-Adjacent | MI | Cass County | 138 kV | 100 MW | 2.2 yrs | 62.9 |
| POKAGON | Substation-Adjacent | MI | Cass County | 138 kV | 100 MW | 2.2 yrs | 62.5 |
| OZ Berrien | Greenfield | MI | Berrien | — | — | 2.2 yrs | 61.6 |
Who owns the transmission lines at TAP139966?
The 3 connected lines listed above are owned by INDIANA MICHIGAN POWER CO. Their combined recorded length is about 3 miles.
How do candidate sites near TAP139966 score?
The 8 highest-scoring candidate sites within about 25 miles range from 62 to 68 on the 0–100 DC Readiness scale. They fall in Cass County, Berrien County, Van Buren County, Berrien. The Michigan average across 5,157 scored sites is 55.2. 768 of those Michigan sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
How many transmission lines connect to TAP139966 substation?
3 transmission lines terminate at or pass through TAP139966 in the HIFLD line data. Together the listed lines cover about 3 miles.
Who owns TAP139966 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP139966 belong to INDIANA MICHIGAN POWER CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP139966 substation located?
TAP139966 is in Michigan at 42.1229, -86.4603. The datacenter candidate sites closest to it are in Cass County, Berrien County, Van Buren County.
Are there datacenter candidate sites near TAP139966 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP139966. The highest-scoring is KENZIE CREEK at 68/100. Across Michigan, the average DC Readiness score is 55.2.
More in Michigan
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, “TAP139966 substation, Michigan”, https://gridcensus.com/substations/michigan/tap139966-c4002b11 (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 TAP139966 substation, Michigan 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.