TWIN BRANCH (138 KV)
SubstationIndiana · INDIANA MICHIGAN POWER CO
At a glance
TWIN BRANCH (138 KV) 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 12 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 |
|---|---|---|---|---|
| #102700 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 4.1 mi |
| #106185 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 4.9 mi |
| #107184 | 138 kV | — | IN SERVICE | 32.1 mi |
| #115947 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 0.2 mi |
| #118040 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 0.2 mi |
| #118694 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 6.2 mi |
| #126943 | 138 kV | INDIANA MICHIGAN POWER CO | — | 4.9 mi |
| #127195 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 16.2 mi |
| #128828 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 8.4 mi |
| #156574 | 138 kV | — | IN SERVICE | 20.6 mi |
| #156575 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 1.1 mi |
| #164638 | 138 kV | INDIANA MICHIGAN POWER CO | IN SERVICE | 0.2 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TWIN BRANCH (138 KV), 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 |
| 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 |
| TAP138974 | Substation-Adjacent | IN | Elkhart County | 345 kV | 600 MW | 3.0 yrs | 66.7 |
| TWIN BRANCH (345 KV) | Substation-Adjacent | IN | St. Joseph County | 345 kV | 600 MW | 3.0 yrs | 66.0 |
| UNKNOWN122939 | Substation-Adjacent | IN | Elkhart County | 345 kV | 600 MW | 3.0 yrs | 65.9 |
| LEESBURG | Substation-Adjacent | IN | Kosciusko County | 345 kV | 600 MW | 3.0 yrs | 65.4 |
How does TWIN BRANCH (138 KV) compare with other substations in Indiana?
Indiana has 2,077 substation records in HIFLD, of which 306 carry a station name; the rest are unnamed tap points, risers and line ends. 114 named substations in the state are in TWIN BRANCH (138 KV)'s 115–229 kV band (37% of named stations). 84 sit in a higher band. 69 named substations in Indiana operate at 345 kV or above. The highest voltage recorded in the state is 765 kV, and the state median is 138 kV.
Who owns the transmission lines at TWIN BRANCH (138 KV)?
The 12 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 99.2 miles.
How do candidate sites near TWIN BRANCH (138 KV) score?
The 8 highest-scoring candidate sites within about 25 miles range from 65 to 71 on the 0–100 DC Readiness scale. They fall in St. Joseph County, Cass County, Elkhart County, Kosciusko 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 TWIN BRANCH (138 KV) substation?
TWIN BRANCH (138 KV) 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 TWIN BRANCH (138 KV) is above the national midpoint.
How many transmission lines connect to TWIN BRANCH (138 KV) substation?
12 transmission lines terminate at or pass through TWIN BRANCH (138 KV) in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 99.2 miles.
Who owns TWIN BRANCH (138 KV) substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TWIN BRANCH (138 KV) belong to INDIANA MICHIGAN POWER CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TWIN BRANCH (138 KV) substation located?
TWIN BRANCH (138 KV) is in Indiana at 41.6687, -86.1355. The datacenter candidate sites closest to it are in St. Joseph County, Cass County, Elkhart County.
Are there datacenter candidate sites near TWIN BRANCH (138 KV) substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TWIN BRANCH (138 KV). The highest-scoring is OLIVE at 71/100. Across Indiana, the average DC Readiness score is 54.
Other 138 kV substations in Indiana
- NORTHEAST· 14 lines
- ROBISON PARK (138 KV)· 12 lines
- LINCOLN· 10 lines
- BROWN (138 KV)· 8 lines
- MCKINLEY· 8 lines
- NEW CARLISLE· 8 lines
- SOUTH BEND· 8 lines
- ANDERSON· 7 lines
- All named substations in Indiana· 306 stations
- Datacenter candidate sites in Indiana· 8,629 sites
- Brownfield and retired plant sites in Indiana
- Substations by state
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, “TWIN BRANCH (138 KV) substation, Indiana”, https://gridcensus.com/substations/indiana/twin-branch-138-kv-0cb68163 (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 TWIN BRANCH (138 KV) 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.