PSE-139
130 MW storage in King, WA · In queue since December 2023 · Proposed COD December 2028
130 MW
Capacity
1
Components
Battery
2y 5m
In Queue
Cluster Study
IA Status
COD target: 2028
Total Duration
5 years
Interconnection request submitted to ISO/RTO
Project undergoes interconnection studies to assess grid impact.
Typical: 18–36 months
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2028-12-30
PSE-139 is a proposed 130 MW battery storage project located in King County, Washington. The project is being developed by Puget Sound Energy (PSE) and consists entirely of battery technology. It is currently active in the Puget Sound Energy interconnection queue (PSE-139) with an entry date of December 15, 2023.
The proposed commercial operation date for PSE-139 is December 30, 2028. Its interconnection status is currently in the Cluster Study phase, and the point of interconnection is the Mount Si 115 kV Substation. The project has appeared in recent news coverage.
Generated from interconnection queue and public data sources
State
WA
County
King
Grid Region
Mountain West
Market
—
Developer
—
Utility
Puget Sound Energy
Entity
PSE
Service Type
—
Point of Interconnection
Mount Si 115 kV Substation
Data Source
LBNL
- ISO / RTO
- MOUNTAIN_WEST
- Trading Hub
- MID-C
- Hub Confidence
- UNKNOWN
This project's market context is estimated from its Point of Interconnection. Hub and node assignments are approximate and based on geographic inference from the POI substation name.
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