FIRSTENERGY W H SAMMIS
SubstationOhio · AMERICAN TRANSMISSION SYSTEMS, INC.
FIRSTENERGY W H SAMMIS is an electric transmission substation in Ohio, operated by AMERICAN TRANSMISSION SYSTEMS, INC.. It is classified as high-voltage (345 kv) and connects 11 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
Ownership & operation
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #17197 | 345 kV | AMERICAN TRANSMISSION SYSTEMS, INC. | IN SERVICE | 47.1 mi |
| #45739 | 345 kV | AMERICAN TRANSMISSION SYSTEMS, INC. | IN SERVICE | 47.4 mi |
| #48186 | 345 kV | OHIO POWER CO | IN SERVICE | 4.3 mi |
| #50039 | 345 kV | — | IN SERVICE | 7.4 mi |
| #65102 | 345 kV | OHIO POWER CO | — | 0.1 mi |
| #28414 | 345 kV | AMERICAN TRANSMISSION SYSTEMS, INC. | IN SERVICE | 68.6 mi |
| #45105 | 345 kV | — | IN SERVICE | 14.0 mi |
| #22056 | 138 kV | OHIO POWER CO | IN SERVICE | 1.5 mi |
| #41146 | 138 kV | OHIO POWER CO | IN SERVICE | 37.3 mi |
| #28619 | 138 kV | OHIO POWER CO | IN SERVICE | 29.9 mi |
| #28910 | 138 kV | OHIO POWER CO | IN SERVICE | 29.8 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of FIRSTENERGY W H SAMMIS, 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 |
|---|---|---|---|---|---|---|---|
| CRANBERRY | Substation-Adjacent | WV | Hancock County | 500 kV | 1,000 MW | 3.2 yrs | 74.7 |
| HOYTDALE | Substation-Adjacent | PA | Beaver County | 345 kV | 600 MW | 3.0 yrs | 74.6 |
| WYLIE RIDGE | Substation-Adjacent | WV | Hancock County | 500 kV | 1,000 MW | 3.2 yrs | 73.1 |
| BEAVER VALLEY | Substation-Adjacent | PA | Beaver County | 345 kV | 600 MW | 3.0 yrs | 72.7 |
| MANSFIELD STATION | Substation-Adjacent | OH | Columbiana County | 345 kV | 600 MW | 3.2 yrs | 72.5 |
| FIRSTENERGY TORONTO | Substation-Adjacent | WV | Hancock County | 345 kV | 600 MW | 3.2 yrs | 71.6 |
| Greenfield (KAMMER (765KV) - SOUTH CANTON ) | Greenfield | OH | Carroll County | 765 kV | 1,000 MW | 3.2 yrs | 71.2 |
| BEAVER VALLEY | Substation-Adjacent | WV | Hancock County | 345 kV | 600 MW | 3.2 yrs | 70.5 |
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
This page shows a public slice of the GridCensus dataset for FIRSTENERGY W H SAMMIS substation, Ohio. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.