ASOTIN
SubstationWashington · PUD NO 1 OF ASOTIN COUNTY
At a glance
ASOTIN is an electric transmission substation in Washington, on PUD NO 1 OF ASOTIN COUNTY's transmission network. It is classified as distribution (<69 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 |
|---|---|---|---|---|
| #208592 | 46 kV | PUD NO 1 OF ASOTIN COUNTY | — | 12.8 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of ASOTIN, 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 |
|---|---|---|---|---|---|---|---|
| HATWAI | Substation-Adjacent | ID | Nez Perce County | 500 kV | 1,000 MW | 5.0 yrs | 64.8 |
| LOWER GRANITE | Substation-Adjacent | WA | Garfield County | 500 kV | 1,000 MW | 3.5 yrs | 64.0 |
| NORTH LEWISTON | Substation-Adjacent | ID | Nez Perce County | 230 kV | 300 MW | 5.0 yrs | 60.7 |
| LOLO | Substation-Adjacent | ID | Nez Perce County | 230 kV | 300 MW | 5.0 yrs | 60.3 |
| OZ Latah | Greenfield | ID | Latah | — | — | 5.0 yrs | 59.8 |
| DRY GULCH | Substation-Adjacent | WA | Asotin County | 230 kV | 300 MW | 3.5 yrs | 58.3 |
| EC Near Washington State University | Greenfield | WA | Whitman | — | — | 3.5 yrs | 57.5 |
| EC Near Washington State University | Greenfield | WA | Whitman | — | — | 3.5 yrs | 57.3 |
How does ASOTIN compare with other substations in Washington?
Washington has 2,106 substation records in HIFLD, of which 785 carry a station name; the rest are unnamed tap points, risers and line ends. 4 named substations in the state are in ASOTIN's below 69 kV band (1% of named stations). 723 sit in a higher band. 34 named substations in Washington operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 115 kV.
Who owns the transmission lines at ASOTIN?
The 1 connected line listed above is owned by PUD NO 1 OF ASOTIN COUNTY. Line voltages range from 46 kV to 46 kV. Their combined recorded length is about 12.8 miles.
How do candidate sites near ASOTIN score?
The 8 highest-scoring candidate sites within about 25 miles range from 57 to 65 on the 0–100 DC Readiness scale. They fall in Nez Perce County, Garfield County, Latah, Asotin County. The Washington average across 6,019 scored sites is 51.7. 1,343 of those Washington sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is ASOTIN substation?
ASOTIN has a maximum voltage of 46 kV. That places it in the below 69 kV band. The median named US substation in this dataset is 115 kV, so ASOTIN is below the national midpoint.
How many transmission lines connect to ASOTIN substation?
1 transmission line terminate at or pass through ASOTIN in the HIFLD line data. The connected lines listed here run at 46 kV. Together the listed lines cover about 12.8 miles.
Who owns ASOTIN substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at ASOTIN belong to PUD NO 1 OF ASOTIN COUNTY. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is ASOTIN substation located?
ASOTIN is in Washington at 46.2878, -117.0701. The datacenter candidate sites closest to it are in Nez Perce County, Garfield County, Latah.
Are there datacenter candidate sites near ASOTIN substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of ASOTIN. The highest-scoring is HATWAI at 65/100. Across Washington, the average DC Readiness score is 51.7.
More in Washington
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, “ASOTIN substation, Washington”, https://gridcensus.com/substations/washington/asotin-641a7d2f (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 ASOTIN substation, Washington 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.