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Battery storage · Contra Costa County, California
ALLEGHENY ENERGY STORAGE
A 353 MW battery storage project in Contra Costa County, California. ALLEGHENY ENERGY STORAGE has money committed on record: a signed interconnection agreement, a financing close or a tax-credit filing. No public record read so far names its builder.
The record
What the public record says about ALLEGHENY ENERGY STORAGE, as of 22 Oct 2026.
| Stage | Financed |
|---|---|
| Construction start | Q3 2031 estimate |
| Size | 353 MW |
| Location | Contra Costa County, California (to about 10 km) |
| Developer | Not named in any record read |
| Grid operator | CAISO |
| Builder (EPC) | Not named yet |
| Trade subcontractors | in the app |
| People to call | in the app |
| Phase windows | in the app |
Every fact in the app links to the public record behind it, with how many records agree and whether it is confirmed, reported or an estimate. What the terms mean.
What happened
Each change dated by the scene or the document, newest first.
No change on record since Groundtrace started tracking it.
Who was named on it, and when, is in the app.
Also in Contra Costa County
| Project | Stage | Size |
|---|---|---|
| BLACK DIAMOND ES2Battery storage | Under construction | 179 MW |
| DELILAH ENERGY STORAGEBattery storage | Financed | 504 MW |
| HARMONY STORAGE 2Battery storage | Queued | 308 MW |
| SHERMAN ENERGY STORAGEBattery storage | Queued | 256 MW |
| BLACK DIAMOND ENERGY STORAGEBattery storage | Operating | 200 MW |
| Diablo Energy StorageBattery storage | Operating | 200 MW |
More
Questions
ALLEGHENY ENERGY STORAGE, in short.
Where is ALLEGHENY ENERGY STORAGE?
ALLEGHENY ENERGY STORAGE is a 353 MW battery storage project in Contra Costa County, California, in CAISO's interconnection queue. The public page places it to within about ten kilometres; the precise location is in the subscriber record.
When does construction start on ALLEGHENY ENERGY STORAGE?
Groundtrace estimates construction starts in the third quarter of 2031. This is an estimate from the project's filings, not a date any record states; the exact date and the record behind it are in the subscriber record.
Who is developing ALLEGHENY ENERGY STORAGE?
No public record read so far names its developer.
Who is building ALLEGHENY ENERGY STORAGE?
No public record read so far names a builder for ALLEGHENY ENERGY STORAGE. Groundtrace leaves the field empty rather than guess, and fills it when a permit, a filing or the builder's own page names one.
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