PSE-99
250 MW storage in King, WA · In queue since April 2021 · Proposed COD June 2025
250 MW
Capacity
1
Components
Battery
5y 1m
In Queue
Suspended
IA Status
COD target: 2025
Total Duration
4y 2m
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: 2025-06-01
PSE-99 is a proposed 250 MW battery storage project located in King County, Washington. The project, under development by Puget Sound Energy (PSE), entered the Puget Sound Energy interconnection queue on April 15, 2021, with a proposed commercial operation date of June 1, 2025. The interconnection point is the Talbot Hill 230 kV Substation.
The project's interconnection status is currently listed as "suspended," and the Interconnection Agreement (IA) status is also "Suspended." The project has appeared in recent news coverage regarding energy storage development in the region.
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
Talbot Hill 230 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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