HARMONY STORAGE 2
307.878 MW storage in Contra Costa, CA · In queue since April 2021 · Proposed COD June 2031
307.878 MW
Capacity
1
Components
Battery
5y 1m
In Queue
System Impact Study
IA Status
COD target: 2031
Total Duration
10y 2m
Interconnection request submitted to ISO/RTO
CAISO uses cluster studies where projects are batched annually and studied together.
Typical: 36–48 months (IR to IA)
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2031-06-05
The Harmony Storage 2 project is a proposed 307.88 MW battery storage project located in Contra Costa County, California. The project is in the California Independent System Operator (CAISO) interconnection queue as entry CAISO-1892, with a queue entry date of April 15, 2021. The proposed commercial operation date is June 5, 2031. The project's interconnection status is currently in the System Impact Study phase.
The project, which interconnects to the PG&E utility grid at the Contra Costa PP 230 kV point of interconnection, has been the subject of recent news coverage, with three articles appearing in industry, deals, and development publications.
Generated from interconnection queue and public data sources
State
CA
County
Contra Costa
Grid Region
CAISO (California)
Market
ISO/RTO Member
Developer
—
Utility
PGAE
Entity
CAISO
Service Type
—
Point of Interconnection
Contra Costa PP 230 kV
Data Source
LBNL + Live
- ISO / RTO
- CAISO
- Trading Hub
- TH_NP15_GEN-APND
- Hub Confidence
- MEDIUM
- Nearest Node (Estimated)
- CCOSTA_2_B1
- POI Substation
- Contra Costa Substation
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.
Last updated 2026-03-26
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