POSTON
SubstationOhio · OHIO POWER CO
At a glance
POSTON is an electric transmission substation in Ohio, on OHIO POWER CO's transmission network. It is classified as sub-transmission (138 kv) and connects 8 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 |
|---|---|---|---|---|
| #109885 | 138 kV | OHIO POWER CO | IN SERVICE | 9.7 mi |
| #110519 | 138 kV | OHIO POWER CO | IN SERVICE | 3.4 mi |
| #116968 | 138 kV | OHIO POWER CO | IN SERVICE | 4.1 mi |
| #125035 | 138 kV | OHIO POWER CO | IN SERVICE | 3.4 mi |
| #126580 | 138 kV | OHIO POWER CO | IN SERVICE | 42.7 mi |
| #141459 | 138 kV | OHIO POWER CO | IN SERVICE | 24.9 mi |
| #149659 | 138 kV | AEP | IN SERVICE | 7.2 mi |
| #173568 | 138 kV | AEP | IN SERVICE | 5.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of POSTON, 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 |
|---|---|---|---|---|---|---|---|
| FLATLICK | Substation-Adjacent | OH | Vinton County | 765 kV | 1,000 MW | 5.2 yrs | 63.6 |
| EC Coal Morgan County | Greenfield | OH | Morgan County | — | — | 5.2 yrs | 59.4 |
| OZ Hocking | Greenfield | OH | Hocking | — | — | 5.2 yrs | 59.3 |
| EC Coal Athens County | Greenfield | OH | Athens County | — | — | 5.2 yrs | 59.1 |
| OZ Athens | Greenfield | OH | Athens | — | — | 5.2 yrs | 58.8 |
| OZ Vinton | Greenfield | OH | Vinton | — | — | 5.2 yrs | 58.7 |
| EC FFE Athens County | Greenfield | OH | Athens County | — | — | 5.2 yrs | 58.2 |
| UNKNOWN154527 | Substation-Adjacent | OH | Fairfield County | 138 kV | 100 MW | 5.2 yrs | 57.9 |
How does POSTON compare with other substations in Ohio?
Ohio has 2,565 substation records in HIFLD, of which 465 carry a station name; the rest are unnamed tap points, risers and line ends. 189 named substations in the state are in POSTON's 115–229 kV band (41% of named stations). 60 sit in a higher band. 60 named substations in Ohio 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 POSTON?
The 8 connected lines listed above are owned by OHIO POWER CO, AEP. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 100.6 miles.
How do candidate sites near POSTON score?
The 8 highest-scoring candidate sites within about 25 miles range from 58 to 64 on the 0–100 DC Readiness scale. They fall in Vinton County, Morgan County, Hocking, Athens County. The Ohio average across 3,933 scored sites is 54.8. 835 of those Ohio sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is POSTON substation?
POSTON 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 POSTON is above the national midpoint.
How many transmission lines connect to POSTON substation?
8 transmission lines terminate at or pass through POSTON in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 100.6 miles.
Who owns POSTON substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at POSTON belong to OHIO POWER CO, and others to AEP. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is POSTON substation located?
POSTON is in Ohio at 39.3826, -82.1793. The datacenter candidate sites closest to it are in Vinton County, Morgan County, Hocking.
Are there datacenter candidate sites near POSTON substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of POSTON. The highest-scoring is FLATLICK at 64/100. Across Ohio, the average DC Readiness score is 54.8.
Other 138 kV substations in Ohio
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, “POSTON substation, Ohio”, https://gridcensus.com/substations/ohio/poston-f9cc5828 (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 POSTON substation, Ohio 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.