King County, WA interconnection queue
3 interconnection applications are pending in King County, WA, requesting 386 MW of new generating capacity, as of 15 August 2026. 5 projects have been built here and 10 have been withdrawn since 2001.
Source: interconnection queues published by BPA, PSE. 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 King County, by fuel
| Fuel | Projects | Capacity requested |
|---|---|---|
| Battery | 3 | 386 MW |
Outcomes of every application filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 5 | 33 MW | 23.8% |
| Still pending | 3 | 386 MW | 14.3% |
| Withdrawn | 10 | 1.2 GW | 47.6% |
| Suspended | 3 | — | 14.3% |
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 |
|---|---|---|---|---|---|
| Enron Power Marketing | Gas | 300 MW | withdrawn | 2001-11 | BPA |
| Cedar Hills Energy LLC | Gas | 300 MW | withdrawn | 2001-05 | BPA |
| 99 | Battery | 250 MW | suspended | 2021-04 | PSE |
| 101 | Battery | 200 MW | suspended | 2021-04 | PSE |
| 138 | Battery | 175 MW | withdrawn | 2023-05 | PSE |
| G1014 | Battery | 156 MW | active | 2023-11 | BPA |
| 136 | Battery | 150 MW | withdrawn | 2022-10 | PSE |
| 139 | Battery | 130 MW | active | 2023-12 | PSE |
| 121 | Battery | 125 MW | suspended | 2021-08 | PSE |
| 143 | Battery | 100 MW | withdrawn | 2024-04 | PSE |
| 148 | Battery | 100 MW | active | 2024-04 | PSE |
| 76 | Battery | 100 MW | withdrawn | 2019-09 | PSE |
| 3 | Other | 27 MW | withdrawn | 2005-05 | PSE |
| 27 | Hydro | 10 MW | withdrawn | 2010-08 | PSE |
| 31 | Hydro | 8 MW | completed | 2011-02 | PSE |
Large-load connection requests in this county
Requests to connect large new demand — data centres, industry, electrification — as distinct from generation. 4 recorded here.
| Request | Capacity | Status | Queue | Stated end use |
|---|---|---|---|---|
| Grand Ridge Substation | 25 MW | active | BPA | not stated |
| Bridgeport I5 Commercial/Industrial Project | 21 MW | energized | BPA | not stated |
| Mt. Si | — | withdrawn | BPA | not stated |
| Novelty Substation | — | withdrawn | BPA | not stated |
494 of the 545 large-load requests we hold state no end use at all, so most cannot be attributed to any industry. Where this table says “not stated”, that is the filing’s own silence, not our omission.
How this county ranks
King County ranks #711 of 1,607 US counties by capacity currently queued, and #23 of 30 in Washington.
Other Washington counties in the queue
| County | Pending | Capacity queued |
|---|---|---|
| Benton County | 20 | 10.5 GW |
| Yakima County | 14 | 6.5 GW |
| Klickitat County | 23 | 6.2 GW |
| Grant County | 13 | 3.7 GW |
| Douglas County | 8 | 3.6 GW |
| Walla Walla County | 8 | 1.7 GW |
| Lincoln County | 8 | 1.6 GW |
| Spokane County | 11 | 973 MW |
Go deeper on King 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 King County on the map County reports All of Washington