SENECA
SubstationOregon · OREGON TRAIL EL CONS COOP, INC
At a glance
SENECA is an electric transmission substation in Oregon, on OREGON TRAIL EL CONS COOP, INC's transmission network. It is classified as sub-transmission (115 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
Ownership
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #208277 | 115 kV | OREGON TRAIL EL CONS COOP, INC | — | 39.8 mi |
| #203626 | 69 kV | OREGON TRAIL EL CONS COOP, INC | — | 19.9 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of SENECA, 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 |
|---|---|---|---|---|---|---|---|
| WEST JOHN DAY | Substation-Adjacent | OR | Grant County | 138 kV | 100 MW | 3.5 yrs | 52.2 |
| SENECA | Substation-Adjacent | OR | Grant County | 115 kV | 100 MW | 3.5 yrs | 51.9 |
| JOHN DAY | Substation-Adjacent | OR | Grant County | 69 kV | 50 MW | 3.5 yrs | 49.9 |
| PRAIRIE CITY | Substation-Adjacent | OR | Grant County | 69 kV | 50 MW | 3.5 yrs | 49.9 |
| Mine Site | Former Mine | OR | Grant County | — | — | 3.5 yrs | 45.6 |
| Blue Mtn. Jr. High | Industrial | OR | Grant County | — | — | 3.5 yrs | 44.8 |
| Mine Site | Former Mine | OR | Grant County | — | — | 3.5 yrs | 44.7 |
| Grant County Airport Industrial Park | Industrial | OR | Grant County | — | — | 3.5 yrs | 44.5 |
How does SENECA compare with other substations in Oregon?
Oregon has 1,414 substation records in HIFLD, of which 554 carry a station name; the rest are unnamed tap points, risers and line ends. 351 named substations in the state are in SENECA's 115–229 kV band (63% of named stations). 110 sit in a higher band. 34 named substations in Oregon operate at 345 kV or above. The highest voltage recorded in the state is 1,000 kV, and the state median is 115 kV.
Who owns the transmission lines at SENECA?
The 2 connected lines listed above are owned by OREGON TRAIL EL CONS COOP, INC. Line voltages range from 69 kV to 115 kV. Their combined recorded length is about 59.7 miles.
How do candidate sites near SENECA score?
The 8 highest-scoring candidate sites within about 25 miles range from 45 to 52 on the 0–100 DC Readiness scale. They fall in Grant County. The Oregon average across 2,430 scored sites is 53.1. 844 of those Oregon sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is SENECA substation?
SENECA has a maximum voltage of 115 kV and a minimum of 69 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so SENECA is at the national midpoint.
How many transmission lines connect to SENECA substation?
2 transmission lines terminate at or pass through SENECA in the HIFLD line data. The connected lines listed here run at 115 kV, 69 kV. Together the listed lines cover about 59.7 miles.
Who owns SENECA substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at SENECA belong to OREGON TRAIL EL CONS COOP, INC. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is SENECA substation located?
SENECA is in Oregon at 44.1698, -118.9875. The datacenter candidate sites closest to it are in Grant County.
Are there datacenter candidate sites near SENECA substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of SENECA. The highest-scoring is WEST JOHN DAY at 52/100. Across Oregon, the average DC Readiness score is 53.1.
Other 115 kV substations in Oregon
- FARADAY· 11 lines
- DIXONVILLE· 10 lines
- EUGENE· 8 lines
- PROSPECT CENTRAL· 8 lines
- CANAMAH· 7 lines
- KNOTT· 7 lines
- SELLWOOD· 7 lines
- SUNSET SUBSTATION· 7 lines
- All named substations in Oregon· 554 stations
- Datacenter candidate sites in Oregon· 2,430 sites
- Brownfield and retired plant sites in Oregon
- 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, “SENECA substation, Oregon”, https://gridcensus.com/substations/oregon/seneca-f9363fd7 (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 SENECA substation, Oregon 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.