PSE-112
127 MW storage in Thurston, WA · In queue since June 2021 · Proposed COD June 2025
127 MW
Capacity
1
Components
Battery
4y 11m
In Queue
IA Executed
IA Status
COD target: 2025
Total Duration
4 years
Schedule
11 months past proposed COD
Interconnection request submitted to ISO/RTO
Project undergoes interconnection studies to assess grid impact.
Typical: 18–36 months
Interconnection agreement executed — binding commitment to build
Typical: 30–60 days (negotiation)
Project under construction
Typical: 6–18 months
Proposed COD: 2025-06-15
The proposed PSE-112 project is a 127 MW battery storage development in Thurston County, Washington. The project is sponsored by Puget Sound Energy (PSE) and consists entirely of battery storage. It is currently active in the Puget Sound Energy interconnection queue, with an interconnection request date of June 23, 2021, and a proposed commercial operation date of June 15, 2025.
The project's interconnection agreement has been executed. The point of interconnection is planned for a new 115 kV substation located between the existing Tono, Blumaer, and Rochester substations. The project has appeared in recent news coverage regarding energy storage projects in the Pacific Northwest.
Generated from interconnection queue and public data sources
State
WA
County
Thurston
Grid Region
Mountain West
Market
—
Developer
—
Utility
Puget Sound Energy
Entity
PSE
Service Type
—
Point of Interconnection
Proposed new 115 kV substation between Tono, Blumaer, and Rochester substations
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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