TAP203478
SubstationWashington · BONNEVILLE POWER ADMINISTRATION
At a glance
TAP203478 is an electric transmission substation in Washington, on BONNEVILLE POWER ADMINISTRATION's transmission network. It is classified as sub-transmission (115 kv) and connects 4 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 |
|---|---|---|---|---|
| #201097 | 115 kV | BONNEVILLE POWER ADMINISTRATION | — | 12.0 mi |
| #201098 | 115 kV | BONNEVILLE POWER ADMINISTRATION | — | 0.0 mi |
| #201099 | 115 kV | BONNEVILLE POWER ADMINISTRATION | — | 9.1 mi |
| #212255 | 115 kV | NORTHERN WASCO COUNTY PUD | — | 1.4 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP203478, 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 |
|---|---|---|---|---|---|---|---|
| SACAJAWEA | Substation-Adjacent | WA | Walla Walla County | 500 kV | 1,000 MW | 3.5 yrs | 67.4 |
| COLUMBIA GENERATING STATION | Substation-Adjacent | WA | Benton County | 500 kV | 1,000 MW | 3.5 yrs | 66.2 |
| TAP203128 | Substation-Adjacent | WA | Walla Walla County | 500 kV | 1,000 MW | 3.5 yrs | 65.9 |
| OZ Benton | Greenfield | WA | Benton | — | — | 3.5 yrs | 64.9 |
| WHITE BLUFFS | Substation-Adjacent | WA | Benton County | 230 kV | 300 MW | 3.5 yrs | 63.0 |
| FRANKLIN | Substation-Adjacent | WA | Franklin County | 230 kV | 300 MW | 3.5 yrs | 62.9 |
| WNP 1 | Substation-Adjacent | WA | Benton County | 230 kV | 300 MW | 3.5 yrs | 61.9 |
| STATELINE | Substation-Adjacent | WA | Walla Walla County | 230 kV | 300 MW | 3.5 yrs | 61.7 |
Who owns the transmission lines at TAP203478?
The 4 connected lines listed above are owned by BONNEVILLE POWER ADMINISTRATION, NORTHERN WASCO COUNTY PUD. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 22.5 miles.
How do candidate sites near TAP203478 score?
The 8 highest-scoring candidate sites within about 25 miles range from 62 to 67 on the 0–100 DC Readiness scale. They fall in Walla Walla County, Benton County, Benton, Franklin 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 TAP203478 substation?
TAP203478 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 TAP203478 is at the national midpoint.
How many transmission lines connect to TAP203478 substation?
4 transmission lines terminate at or pass through TAP203478 in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 22.5 miles.
Who owns TAP203478 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP203478 belong to BONNEVILLE POWER ADMINISTRATION, and others to NORTHERN WASCO COUNTY PUD. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP203478 substation located?
TAP203478 is in Washington at 46.3288, -119.1188. The datacenter candidate sites closest to it are in Walla Walla County, Benton County, Benton.
Are there datacenter candidate sites near TAP203478 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP203478. The highest-scoring is SACAJAWEA at 67/100. 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, “TAP203478 substation, Washington”, https://gridcensus.com/substations/washington/tap203478-ba03ecfa (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 TAP203478 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.