COWLITZ
SubstationWashington · BONNEVILLE POWER ADMINISTRATION
COWLITZ is an electric transmission substation in Washington, operated by BONNEVILLE POWER ADMINISTRATION. It is classified as high-voltage (230 kv) and connects 11 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 |
|---|---|---|---|---|
| #67982 | 230 kV | BONNEVILLE POWER ADMINISTRATION | — | 6.3 mi |
| #72398 | 230 kV | CITY OF TACOMA - (WA) | — | 6.7 mi |
| #72399 | 230 kV | CITY OF TACOMA - (WA) | — | 6.7 mi |
| #72400 | 230 kV | CITY OF TACOMA - (WA) | — | 6.2 mi |
| #72401 | 230 kV | CITY OF TACOMA - (WA) | — | 6.2 mi |
| #74080 | 115 kV | CITY OF TACOMA - (WA) | — | 2.3 mi |
| #74092 | 115 kV | ELMHURST MUTUAL POWER & LIGHT CO | — | 4.8 mi |
| #68023 | 115 kV | BONNEVILLE POWER ADMINISTRATION | — | 6.3 mi |
| #72052 | 115 kV | CITY OF TACOMA - (WA) | — | 3.1 mi |
| #72053 | 115 kV | CITY OF TACOMA - (WA) | — | 6.0 mi |
| #74093 | 115 kV | ELMHURST MUTUAL POWER & LIGHT CO | — | 3.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of COWLITZ, 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 |
|---|---|---|---|---|---|---|---|
| MAPLE VALLEY | Substation-Adjacent | WA | King County | 500 kV | 1,000 MW | 1.7 yrs | 76.0 |
| TACOMA | Substation-Adjacent | WA | Pierce County | 500 kV | 1,000 MW | 1.7 yrs | 75.6 |
| BERRYDALE | Substation-Adjacent | WA | King County | 230 kV | 300 MW | 1.7 yrs | 73.1 |
| SOUTHWEST | Substation-Adjacent | WA | Pierce County | 230 kV | 300 MW | 1.7 yrs | 72.4 |
| TAP206441 | Substation-Adjacent | WA | Pierce County | 230 kV | 300 MW | 1.7 yrs | 72.3 |
| SOUTH | Substation-Adjacent | WA | Kitsap County | 230 kV | 300 MW | 1.7 yrs | 72.1 |
| KLAHANIE | Substation-Adjacent | WA | King County | 230 kV | 300 MW | 1.7 yrs | 72.0 |
| UNKNOWN205981 | Substation-Adjacent | WA | Kitsap County | 230 kV | 300 MW | 1.7 yrs | 71.9 |
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 COWLITZ 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.