GRAYS HARBOR
SubstationWashington · BONNEVILLE POWER ADMINISTRATION
At a glance
GRAYS HARBOR is an electric transmission substation in Washington, operated by BONNEVILLE POWER ADMINISTRATION. It is classified as high-voltage (230 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 & operation
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #200352 | 230 kV | BONNEVILLE POWER ADMINISTRATION | — | 0.7 mi |
| #206662 | 230 kV | BONNEVILLE POWER ADMINISTRATION | — | 0.1 mi |
| #206977 | 230 kV | BONNEVILLE POWER ADMINISTRATION | — | 0.1 mi |
| #206978 | 230 kV | BONNEVILLE POWER ADMINISTRATION | — | 0.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of GRAYS HARBOR, 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 |
| SHELTON | Substation-Adjacent | WA | Mason County | 230 kV | 300 MW | 3.5 yrs | 60.1 |
| 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 Mason | Greenfield | WA | Mason | — | — | 3.5 yrs | 59.1 |
| OZ Pacific | Greenfield | WA | Pacific | — | — | 3.5 yrs | 56.3 |
| TAP203439 | Substation-Adjacent | WA | Mason County | 115 kV | 100 MW | 3.5 yrs | 55.7 |
How does GRAYS HARBOR 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. 103 named substations in the state are in GRAYS HARBOR's 230–344 kV band (13% of named stations). 34 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 GRAYS HARBOR?
The 4 connected lines listed above are owned by BONNEVILLE POWER ADMINISTRATION. Line voltages range from 230 kV to 230 kV. Their combined recorded length is about 1 miles.
How do candidate sites near GRAYS HARBOR 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, Mason County, Mason, 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
What voltage is GRAYS HARBOR substation?
GRAYS HARBOR has a maximum voltage of 230 kV. That places it in the 230–344 kV band. The median named US substation in this dataset is 115 kV, so GRAYS HARBOR is above the national midpoint.
How many transmission lines connect to GRAYS HARBOR substation?
4 transmission lines terminate at or pass through GRAYS HARBOR in the HIFLD line data. The connected lines listed here run at 230 kV. Together the listed lines cover about 1 miles.
Who owns GRAYS HARBOR substation?
HIFLD lists BONNEVILLE POWER ADMINISTRATION as the operator of GRAYS HARBOR.
Where is GRAYS HARBOR substation located?
GRAYS HARBOR is in Washington at 46.9682, -123.4798. The datacenter candidate sites closest to it are in Grays Harbor County, Mason County, Mason.
Are there datacenter candidate sites near GRAYS HARBOR substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of GRAYS HARBOR. The highest-scoring is SATSOP at 64/100. Across Washington, the average DC Readiness score is 51.7.
Other 230 kV substations in Washington
- MIDWAY· 16 lines
- WHITE RIVER· 16 lines
- SHELTON· 15 lines
- TALBOT HILL· 15 lines
- BEACON· 14 lines
- LONGVIEW1· 14 lines
- OBRIEN· 14 lines
- BOTHELL· 13 lines
- All named substations in Washington· 785 stations
- Datacenter candidate sites in Washington· 6,019 sites
- Brownfield and retired plant sites in Washington
- 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, “GRAYS HARBOR substation, Washington”, https://gridcensus.com/substations/washington/grays-harbor-8648e342 (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 GRAYS HARBOR 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.