EAST RIVER MOUNTAIN
SubstationWest Virginia · APPALACHIAN POWER CO
At a glance
EAST RIVER MOUNTAIN is an electric transmission substation in West Virginia, on APPALACHIAN POWER CO's transmission network. It is classified as sub-transmission (138 kv) and connects 2 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 |
|---|---|---|---|---|
| #110388 | 138 kV | APPALACHIAN POWER CO | IN SERVICE | 6.1 mi |
| #122246 | 138 kV | APPALACHIAN POWER CO | IN SERVICE | 7.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of EAST RIVER MOUNTAIN, 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 |
|---|---|---|---|---|---|---|---|
| OZ Mercer | Greenfield | WV | Mercer | — | — | 3.0 yrs | 60.3 |
| EC Coal Mercer County | Greenfield | WV | Mercer County | — | — | 3.0 yrs | 59.7 |
| OZ Mercer | Greenfield | WV | Mercer | — | — | 3.0 yrs | 58.1 |
| CARSWELL | Substation-Adjacent | WV | McDowell County | 138 kV | 100 MW | 3.0 yrs | 57.5 |
| TAP154211 | Substation-Adjacent | VA | Giles County | 138 kV | 100 MW | 5.1 yrs | 57.4 |
| EC Coal McDowell County | Greenfield | WV | McDowell County | — | — | 3.0 yrs | 57.4 |
| EC Coal Mercer County | Greenfield | WV | Mercer County | — | — | 3.0 yrs | 56.8 |
| TAP155305 | Substation-Adjacent | WV | Mercer County | 138 kV | 100 MW | 3.0 yrs | 56.7 |
How does EAST RIVER MOUNTAIN compare with other substations in West Virginia?
West Virginia has 744 substation records in HIFLD, of which 165 carry a station name; the rest are unnamed tap points, risers and line ends. 85 named substations in the state are in EAST RIVER MOUNTAIN's 115–229 kV band (52% of named stations). 19 sit in a higher band. 19 named substations in West Virginia 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 EAST RIVER MOUNTAIN?
The 2 connected lines listed above are owned by APPALACHIAN POWER CO. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 13.3 miles.
How do candidate sites near EAST RIVER MOUNTAIN score?
The 8 highest-scoring candidate sites within about 25 miles range from 57 to 60 on the 0–100 DC Readiness scale. They fall in Mercer, Mercer County, McDowell County, Giles County. The West Virginia average across 3,734 scored sites is 52. 378 of those West Virginia sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is EAST RIVER MOUNTAIN substation?
EAST RIVER MOUNTAIN 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 EAST RIVER MOUNTAIN is above the national midpoint.
How many transmission lines connect to EAST RIVER MOUNTAIN substation?
2 transmission lines terminate at or pass through EAST RIVER MOUNTAIN in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 13.3 miles.
Who owns EAST RIVER MOUNTAIN substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at EAST RIVER MOUNTAIN belong to APPALACHIAN POWER CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is EAST RIVER MOUNTAIN substation located?
EAST RIVER MOUNTAIN is in West Virginia at 37.2818, -81.1264. The datacenter candidate sites closest to it are in Mercer, Mercer County, McDowell County.
Are there datacenter candidate sites near EAST RIVER MOUNTAIN substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of EAST RIVER MOUNTAIN. The highest-scoring is OZ Mercer at 60/100. Across West Virginia, the average DC Readiness score is 52.
Other 138 kV substations in West Virginia
- TURNER· 12 lines
- CHEMICAL· 11 lines
- BRADLEY· 10 lines
- BRUES· 10 lines
- BAILEYSVILLE· 8 lines
- GEORGE WASHINGTON· 8 lines
- RIDGELEY· 8 lines
- DARRAH· 6 lines
- All named substations in West Virginia· 165 stations
- Datacenter candidate sites in West Virginia· 3,734 sites
- Brownfield and retired plant sites in West Virginia
- 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, “EAST RIVER MOUNTAIN substation, West Virginia”, https://gridcensus.com/substations/west-virginia/east-river-mountain-b3f51a5f (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 EAST RIVER MOUNTAIN substation, West Virginia 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.