Contra Costa County, CA interconnection queue
5 interconnection applications are pending in Contra Costa County, CA, requesting 1.6 GW of new generating capacity, as of 15 August 2026. 8 projects have been built here and 40 have been withdrawn since 2000.
Source: interconnection queues published by CAISO. Parsed and normalised by Watt Street. Data as of 15 August 2026. A queued project is a request, not a commitment.
What is waiting in Contra Costa County, by fuel
| Fuel | Projects | Capacity requested |
|---|---|---|
| Battery | 5 | 1.6 GW |
Outcomes of every application filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 8 | 1.0 GW | 15.1% |
| Still pending | 5 | 1.6 GW | 9.4% |
| Withdrawn | 40 | 8.8 GW | 75.5% |
| Suspended | 0 | — | 0.0% |
Withdrawal is the ordinary outcome of an interconnection application nationally, not a sign of a problem in this county. Most withdrawals are a developer testing a site and moving on.
The largest projects on file
| Project | Fuel | Capacity | Status | Filed | Queue |
|---|---|---|---|---|---|
| Withdrawn project | Gas | 651 MW | withdrawn | 2007-09 | CAISO |
| Withdrawn project | Gas | 650 MW | withdrawn | 2007-11 | CAISO |
| Withdrawn project | Battery | 650 MW | withdrawn | 2019-04 | CAISO |
| Withdrawn project | Gas | 630 MW | withdrawn | 2007-06 | CAISO |
| Withdrawn project | Gas | 611 MW | withdrawn | 2008-03 | CAISO |
| Withdrawn project | Gas | 611 MW | withdrawn | 2008-03 | CAISO |
| GATEWAY GENERATING FACILITY (FKA CONTRA COSTA POWER PLANT PROJECT) | Gas | 590 MW | completed | 2000-02 | CAISO |
| Withdrawn project | Gas | 590 MW | withdrawn | 2004-12 | CAISO |
| Withdrawn project | Gas | 531 MW | withdrawn | 2004-12 | CAISO |
| DELILAH ENERGY STORAGE | Battery | 500 MW | active | 2021-04 | CAISO |
| Withdrawn project | Battery | 500 MW | withdrawn | 2021-04 | CAISO |
| ALLEGHENY ENERGY STORAGE | Battery | 325 MW | active | 2021-04 | CAISO |
| Withdrawn project | Gas | 309 MW | withdrawn | 2014-04 | CAISO |
| HARMONY STORAGE 2 | Battery | 300 MW | active | 2021-04 | CAISO |
| Withdrawn project | Battery | 300 MW | withdrawn | 2021-04 | CAISO |
How this county ranks
Contra Costa County ranks #251 of 1,607 US counties by capacity currently queued, and #14 of 42 in California.
Other California counties in the queue
| County | Pending | Capacity queued |
|---|---|---|
| Los Angeles County | 33 | 15.0 GW |
| Kern County | 51 | 13.8 GW |
| Riverside County | 23 | 8.4 GW |
| San Bernardino County | 19 | 7.3 GW |
| Imperial County | 35 | 6.7 GW |
| Fresno County | 28 | 6.5 GW |
| Sacramento County | 16 | 3.6 GW |
| Kings County | 8 | 2.5 GW |
Go deeper on Contra Costa County
The interactive map plots every one of these applications, and a generated county report puts them in a sourced PDF with the date each figure was true on every page.
Open Contra Costa County on the map County reports All of California