PSE-149
200 MW storage in Whatcom, WA · In queue since April 2024 · Proposed COD December 2027
200 MW
Capacity
1
Components
Battery
2y 1m
In Queue
Cluster Study
IA Status
COD target: 2027
Total Duration
3y 8m
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: 2027-12-31
PSE-149 is a proposed 200 MW battery storage project located in Whatcom County, Washington. The project, developed by Puget Sound Energy (PSE), entered the PSE interconnection queue on April 17, 2024, with a proposed commercial operation date of December 31, 2027. Its interconnection status is currently in the Cluster Study phase.
The project will interconnect at the Arco Central 115kV Substation. The development has appeared in recent news coverage regarding Puget Sound Energy's grid modernization efforts.
Generated from interconnection queue and public data sources
State
WA
County
Whatcom
Grid Region
Mountain West
Market
—
Developer
—
Utility
Puget Sound Energy
Entity
PSE
Service Type
—
Point of Interconnection
Arco Central 115kV 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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