HYAK
SubstationWashington · PUGET SOUND ENERGY INC
HYAK is an electric transmission substation in Washington, operated by PUGET SOUND ENERGY INC. It is classified as sub-transmission (138 kv) and connects 2 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #73649 | 138 kV | PUGET SOUND ENERGY INC | — | 16.1 mi |
| #77732 | 115 kV | PUGET SOUND ENERGY INC | — | 8.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of HYAK, 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 |
|---|---|---|---|---|---|---|---|
| Greenfield (CHIEF JOSEPH - MONROE) | Greenfield | WA | Snohomish County | 500 kV | 1,000 MW | 1.7 yrs | 66.9 |
| UNKNOWN202391 | Substation-Adjacent | WA | King County | 230 kV | 300 MW | 1.7 yrs | 66.4 |
| Greenfield (SCHULTZ - RAVER) | Greenfield | WA | King County | 500 kV | 1,000 MW | 1.7 yrs | 65.1 |
| Greenfield (ROCKY REACH - MAPLE VALLEY) | Greenfield | WA | King County | 345 kV | 600 MW | 1.7 yrs | 64.1 |
| UNKNOWN202932 | Substation-Adjacent | WA | King County | 138 kV | 100 MW | 1.7 yrs | 63.8 |
| TAP209035 | Substation-Adjacent | WA | Pierce County | 115 kV | 100 MW | 1.7 yrs | 63.8 |
| Greenfield (SCHULTZ - RAVER) | Greenfield | WA | King County | 500 kV | 1,000 MW | 1.7 yrs | 63.7 |
| Greenfield (SCHULTZ - RAVER) | Greenfield | WA | King County | 500 kV | 1,000 MW | 1.7 yrs | 63.5 |
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
This page shows a public slice of the GridCensus dataset for HYAK substation, Washington. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.