COSMOPOLIS
SubstationWashington · PUD NO 1 OF GRAYS HARBOR COUNTY
At a glance
COSMOPOLIS is an electric transmission substation in Washington, on PUD NO 1 OF GRAYS HARBOR COUNTY's transmission network. It is classified as unclassified and connects 0 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 |
|---|---|---|---|---|
| #206326 | 138 kV | PUD NO 1 OF GRAYS HARBOR COUNTY | — | 4.5 mi |
| #206328 | 138 kV | PUD NO 1 OF GRAYS HARBOR COUNTY | — | 0.2 mi |
| #200923 | 115 kV | BONNEVILLE POWER ADMINISTRATION | — | 18.4 mi |
| #206323 | 115 kV | BONNEVILLE POWER ADMINISTRATION | — | 9.2 mi |
| #206325 | 69 kV | PUD NO 1 OF GRAYS HARBOR COUNTY | — | 6.8 mi |
| #208129 | 69 kV | PUD NO 1 OF GRAYS HARBOR COUNTY | — | 0.0 mi |
| #206330 | 69 kV | PUD NO 1 OF GRAYS HARBOR COUNTY | — | 0.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of COSMOPOLIS, 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 |
|---|---|---|---|---|---|---|---|
| SATSOP | Substation-Adjacent | WA | Grays Harbor County | 500 kV | 1,000 MW | 3.5 yrs | 63.7 |
| UNKNOWN206447 | Substation-Adjacent | WA | Grays Harbor County | 230 kV | 300 MW | 3.5 yrs | 59.5 |
| TAP206448 | Substation-Adjacent | WA | Grays Harbor County | 230 kV | 300 MW | 3.5 yrs | 59.4 |
| GRAYS HARBOR | Substation-Adjacent | WA | Grays Harbor County | 230 kV | 300 MW | 3.5 yrs | 59.3 |
| OZ Pacific | Greenfield | WA | Pacific | — | — | 3.5 yrs | 56.3 |
| UNKNOWN206446 | Substation-Adjacent | WA | Grays Harbor County | 138 kV | 100 MW | 3.5 yrs | 55.5 |
| TAP207120 | Substation-Adjacent | WA | Grays Harbor County | 138 kV | 100 MW | 3.5 yrs | 55.5 |
| TAP207110 | Substation-Adjacent | WA | Grays Harbor County | 138 kV | 100 MW | 3.5 yrs | 55.5 |
Who owns the transmission lines at COSMOPOLIS?
The 7 connected lines listed above are owned by PUD NO 1 OF GRAYS HARBOR COUNTY, BONNEVILLE POWER ADMINISTRATION. Line voltages range from 69 kV to 138 kV. Their combined recorded length is about 39.5 miles.
How do candidate sites near COSMOPOLIS score?
The 8 highest-scoring candidate sites within about 25 miles range from 56 to 64 on the 0–100 DC Readiness scale. They fall in Grays Harbor County, Pacific. 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
How many transmission lines connect to COSMOPOLIS substation?
0 transmission lines terminate at or pass through COSMOPOLIS in the HIFLD line data. The connected lines listed here run at 138 kV, 115 kV, 69 kV. Together the listed lines cover about 39.5 miles.
Who owns COSMOPOLIS substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at COSMOPOLIS belong to PUD NO 1 OF GRAYS HARBOR COUNTY, and others to BONNEVILLE POWER ADMINISTRATION. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is COSMOPOLIS substation located?
COSMOPOLIS is in Washington at 46.9560, -123.7724. The datacenter candidate sites closest to it are in Grays Harbor County, Pacific.
Are there datacenter candidate sites near COSMOPOLIS substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of COSMOPOLIS. The highest-scoring is SATSOP at 64/100. 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, “COSMOPOLIS substation, Washington”, https://gridcensus.com/substations/washington/cosmopolis-b12d01d1 (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 COSMOPOLIS 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.