SUMNER
SubstationOregon · COOS-CURRY ELECTRIC COOP, INC
At a glance
SUMNER is an electric transmission substation in Oregon, on COOS-CURRY ELECTRIC COOP, INC's transmission network. It is classified as sub-transmission (115 kv) and connects 1 transmission line. 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 |
|---|---|---|---|---|
| #200602 | 115 kV | COOS-CURRY ELECTRIC COOP, INC | — | 0.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of SUMNER, 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 |
|---|---|---|---|---|---|---|---|
| ISTHMUS | Substation-Adjacent | OR | Coos County | 230 kV | 300 MW | 3.5 yrs | 62.7 |
| FAIRVIEW | Substation-Adjacent | OR | Coos County | 230 kV | 300 MW | 3.5 yrs | 61.4 |
| COOS BAY | Substation-Adjacent | OR | Coos County | 115 kV | 100 MW | 3.5 yrs | 58.3 |
| STATE ST. | Substation-Adjacent | OR | Coos County | 115 kV | 100 MW | 3.5 yrs | 58.3 |
| LOCKHART | Substation-Adjacent | OR | Coos County | 115 kV | 100 MW | 3.5 yrs | 58.3 |
| UNKNOWN202685 | Substation-Adjacent | OR | Coos County | 115 kV | 100 MW | 3.5 yrs | 58.3 |
| TAP203281 | Substation-Adjacent | OR | Coos County | 115 kV | 100 MW | 3.5 yrs | 58.2 |
| COQUILLE | Substation-Adjacent | OR | Coos County | 115 kV | 100 MW | 3.5 yrs | 58.2 |
How does SUMNER 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 SUMNER'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 SUMNER?
The 1 connected line listed above is owned by COOS-CURRY ELECTRIC COOP, INC. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 0 miles.
How do candidate sites near SUMNER score?
The 8 highest-scoring candidate sites within about 25 miles range from 58 to 63 on the 0–100 DC Readiness scale. They fall in Coos 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 SUMNER substation?
SUMNER has a maximum voltage of 115 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so SUMNER is at the national midpoint.
How many transmission lines connect to SUMNER substation?
1 transmission line terminate at or pass through SUMNER in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 0 miles.
Who owns SUMNER substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at SUMNER belong to COOS-CURRY ELECTRIC COOP, INC. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is SUMNER substation located?
SUMNER is in Oregon at 43.2555, -124.1603. The datacenter candidate sites closest to it are in Coos County.
Are there datacenter candidate sites near SUMNER substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of SUMNER. The highest-scoring is ISTHMUS at 63/100. 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, “SUMNER substation, Oregon”, https://gridcensus.com/substations/oregon/sumner-5e9d6041 (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 SUMNER 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.