Data centers and new power in Maricopa County, AZ
25.2 GW of new power is waiting to connect to the grid in Maricopa County, AZ — 91 active requests. Typical wait: 4.0 years. 35 projects are built, 253 withdrawn. Data as of 14 October 2026.
How far is it from your house?
Microsoft Goodyear, run by Microsoft, is in Maricopa County and uses about as much electricity as 162,000 homes.
Plus 1 more mapped in this county.
What is happening with electricity in Maricopa County
Every new power plant, battery or big customer has to join a waiting list before it can plug into the grid. This is what that list looks like in Maricopa County right now.
Where every request ever filed here ended up
Most requests in the US are withdrawn — a developer tests a site and moves on. That is normal, not a warning sign for Maricopa County.
What kind of power is asking to connect
By capacity requested. Data as of 14 October 2026.
All the numbers
385 requests ever filed
Source: interconnection queues published by APS, CAISO, SRP, SRP_ANPP, WAPA-DSW. Parsed and normalised by Watt Street. Data as of 14 October 2026. A queued project is a request, not a commitment.
Outcome of every request filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 35 | 8.7 GW | 9.1% |
| Still waiting | 91 | 25.2 GW | 23.6% |
| Withdrawn | 253 | 50.8 GW | 65.7% |
| Paused | 6 | — | 1.6% |
Waiting to connect, by type of power
| Type | Projects | Capacity requested |
|---|---|---|
| Solar | 27 | 9.1 GW |
| Other | 28 | 7.6 GW |
| Batteries | 24 | 5.9 GW |
| Natural gas | 8 | 1.5 GW |
| Solar + battery | 4 | 1.1 GW |
Key dates for projects here
1 dated · next closes 2026-10-15 (CAISO)
| Queue | What closes | Closes | Standing |
|---|---|---|---|
| CAISO | CAISO Cluster 16 interconnection request window Interconnection requests submitted through the GRIP portal. | 2026-10-15 | confirmed source |
| FERC | FERC large-load show cause — stakeholder comments on RTO responses Comments on the six RTO/ISO responses to the FPA section 206 show-cause orders of 18 June 2026 (PJM EL26-67, SPP EL26-68, NYISO EL26-69, MISO EL26-70… | No date published yet | unconfirmed source |
| FERC | FERC RM26-4 — generic large-load rulemaking Still at ANOPR stage. | No date published yet | confirmed source |
| FERC | Georgia PSC - Georgia Power must file large-load contracts 30 days before execution A standing obligation rather than a dated one: large-load contracts must be filed with the commission at least 30 days before they are executed. | No date published yet | confirmed source |
A date marked confirmed was checked by a person against the authority's own tariff, order or form page. Anything else is listed so you know it exists, with a link so you can check it yourself. Full calendar.
The biggest projects on file
top 15 by size
| Project | Type | Capacity | Status | Filed | Queue |
|---|---|---|---|---|---|
| Q20 | Natural gas | 2.3 GW | completed | 2005-09 | APS |
| Withdrawn project | Solar + battery | 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 | Batteries | 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 | Natural gas | 900 MW | withdrawn | 2017-09 | APS |
| Q57 | Solar | 900 MW | withdrawn | 2008-12 | APS |
| Withdrawn project | Solar + battery | 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 Maricopa County compares
#1 in the US · #1 in AZ
Maricopa County ranks #1 of 1,607 US counties by power waiting to connect, and #1 of 10 in Arizona.
| County | Waiting | 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 |
Common questions about power in Maricopa County
How long does it take to get power for a data center in Maricopa County, AZ?
The median wait for a project still in the interconnection queue in Maricopa County is 4.0 years. Across the US, most large loads are quoted three to seven years depending on the market and whether network upgrades are needed. 35 projects in Maricopa County have reached energization and 253 were withdrawn, so the withdrawal rate here is a better guide to risk than any single quoted timeline.
How much capacity is available in Maricopa County, AZ?
25.2 GW is currently requested across 91 active interconnection requests, and 8.7 GW has actually been built. A queued megawatt is a request, not deliverable capacity — most queued projects are never built. For deliverable offtake capacity at a specific substation you need a utility study, not a queue.
Is Maricopa County, AZ a good site for a data center?
This page gives you the power half of that answer: what is queued, what has been energized, how long the wait runs, and which large load interconnection requests are already recorded nearby. The other half — the state policy position, moratoriums and large load tariffs — is on our Arizona policy page.
Where does the data on this page come from?
The interconnection queue published by the transmission providers serving Maricopa County — APS, CAISO, SRP, SRP_ANPP, WAPA-DSW — parsed and normalised by Watt Street. Every figure carries the date it was true. Data as of 14 October 2026.
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