San Mateo County, CA interconnection queue
1 interconnection applications are pending in San Mateo County, CA, requesting 250 MW of new generating capacity, as of 15 August 2026. 1 projects have been built here and 10 have been withdrawn since 2005.
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 San Mateo County, by fuel
| Fuel | Projects | Capacity requested |
|---|---|---|
| Battery | 1 | 250 MW |
Outcomes of every application filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 1 | 13 MW | 8.3% |
| Still pending | 1 | 250 MW | 8.3% |
| Withdrawn | 10 | 958 MW | 83.3% |
| 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| Withdrawn project | Battery | 412 MW | withdrawn | 2015-04 | CAISO |
| BAYLANDS BATTERY | Battery | 250 MW | active | 2021-04 | CAISO |
| Withdrawn project | Battery | 250 MW | withdrawn | 2020-04 | CAISO |
| Withdrawn project | Battery | 65 MW | withdrawn | 2021-04 | CAISO |
| Withdrawn project | Battery | 50 MW | withdrawn | 2014-04 | CAISO |
| Withdrawn project | Battery | 41 MW | withdrawn | 2021-04 | CAISO |
| Withdrawn project | Battery | 40 MW | withdrawn | 2018-04 | CAISO |
| Withdrawn project | Battery | 40 MW | withdrawn | 2021-04 | CAISO |
| Withdrawn project | Battery | 20 MW | withdrawn | 2016-05 | CAISO |
| Withdrawn project | Battery | 20 MW | withdrawn | 2015-04 | CAISO |
| Withdrawn project | Battery | 20 MW | withdrawn | 2017-05 | CAISO |
| OX MOUNTAIN LANDFILL GAS GENERATION | Unknown | 13 MW | completed | 2005-06 | CAISO |
How this county ranks
San Mateo County ranks #843 of 1,607 US counties by capacity currently queued, and #26 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 San Mateo 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 San Mateo County on the map County reports All of California