Maricopa County, AZ interconnection queue
91 interconnection applications are pending in Maricopa County, AZ, requesting 25.2 GW of new generating capacity, as of 15 August 2026. 35 projects have been built here and 253 have been withdrawn since 2005.
Source: interconnection queues published by APS, CAISO, SRP, SRP_ANPP, WAPA-DSW. 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 Maricopa County, by fuel
| Fuel | Projects | Capacity requested |
|---|---|---|
| Solar | 27 | 9.1 GW |
| Other | 28 | 7.6 GW |
| Battery | 24 | 5.9 GW |
| Gas | 8 | 1.5 GW |
| Hybrid | 4 | 1.1 GW |
Outcomes of every application filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 35 | 8.7 GW | 9.1% |
| Still pending | 91 | 25.2 GW | 23.6% |
| Withdrawn | 253 | 50.8 GW | 65.7% |
| Suspended | 6 | — | 1.6% |
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 |
|---|---|---|---|---|---|
| Q20 | Gas | 2.3 GW | completed | 2005-09 | APS |
| Withdrawn project | Hybrid | 2.0 GW | withdrawn | 2020-04 | CAISO |
| Q2405 | Solar | 1.0 GW | active | 2024-02 | SRP |
| Q379 | Solar | 1.0 GW | suspended | 2021-03 | APS |
| Q468 | Battery | 1.0 GW | active | 2022-03 | APS |
| Q474 | Solar | 1.0 GW | active | 2022-03 | APS |
| Q508 | Solar | 1.0 GW | withdrawn | 2023-03 | APS |
| Withdrawn project | Solar | 900 MW | withdrawn | 2008-05 | CAISO |
| Q261 | Gas | 900 MW | withdrawn | 2017-09 | APS |
| Q57 | Solar | 900 MW | withdrawn | 2008-12 | APS |
| Withdrawn project | Hybrid | 800 MW | withdrawn | 2021-04 | CAISO |
| Q39 | Solar | 800 MW | withdrawn | 2007-12 | APS |
| Q27 | Solar | 770 MW | completed | 2019-02 | SRP_ANPP |
| ANPP HVS-Q27 | Solar | 770 MW | completed | 2019-02 | SRP_ANPP |
| Withdrawn project | Solar | 700 MW | withdrawn | 2011-03 | CAISO |
How this county ranks
Maricopa County ranks #1 of 1,607 US counties by capacity currently queued, and #1 of 10 in Arizona.
Other Arizona counties in the queue
| County | Pending | Capacity queued |
|---|---|---|
| Navajo County | 25 | 9.4 GW |
| Mohave County | 22 | 7.8 GW |
| Coconino County | 13 | 7.8 GW |
| Yuma County | 23 | 7.3 GW |
| La Paz County | 7 | 5.8 GW |
| Pima County | 19 | 4.9 GW |
| Apache County | 10 | 3.9 GW |
| Yavapai County | 5 | 1.5 GW |
Go deeper on Maricopa 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 Maricopa County on the map County reports All of Arizona