WA Queue Project 139 — Battery in King County, Washington
WA Queue Project 139 — Battery in King County, Washington is a 130.0 MW battery interconnection project in King County, Washington with a current status of active. It is proposed to connect at Mount Si 115kV Substation.
130.0 MWCapacity
ActiveStatus
WAMarket
BatteryTechnology
Project facts
| Canonical name | WA Queue Project 139 — Battery in King County, Washington |
|---|---|
| Queue ID | 139 |
| Status | active |
| Source status | Transitional Cluster Study |
| Market | WA |
| Technology | Battery |
| Capacity | 130.0 MW |
| State | Washington |
| County | King County |
| Point of interconnection | Mount Si 115kV Substation |
| Requested (queue) date | 2023-12-15 |
| Proposed in-service date | 2029-10-17 |
| Operational date | — |
| Withdrawn date | — |
| Developer | — |
| Utility / transmission owner | Puget Sound Energy |
Cross-source records
This project is also observed in: Lawrence Berkeley National Laboratory — Queued Up interconnection dataset. interXdata links these source records without double-counting the project.
What changed
| Observed | Field | Old value | New value | Materiality |
|---|---|---|---|---|
| 2026-08-04 | new_project | — | active | high |
Explore related data
Source last checked2026-08-04
Data last materially changed2026-08-04
Page data generated2026-08-27
Provenance: pse-oasis. Values are normalized from public source records into the interXdata canonical warehouse; see each source for original filings.
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