75.0% of Arizona's Queue Is Solar

Solar makes up 75.0% of Arizona's interconnection queue. As of July 9, 2026, the sealed interconnection-queue snapshot counts 72 projects totaling 32,962 MW (33.0 GW) with a point of interconnection in Arizona, and 54 of those 72 are bucketed as Solar. Every one of the 72 is a request to connect, not a built, approved, or financed project — a large share of queue positions nationally end up withdrawn before construction, and Arizona's own withdrawal share sits above the edition-wide average.

This is a census of the published queues that our grid-queue clock captures daily, not of every project on every grid in the country: generation and storage projects sitting in the interconnection queues of the U.S. grid operators (ISOs and RTOs) that publish a machine-readable queue, as captured by our sealed daily grid snapshots.

Two facts anchor this report: the 75.0% Solar share is one of the most lopsided single-fuel concentrations in this entire edition, and Arizona's queue also holds the largest single project in the whole 12,260-project census, a detail covered alongside every other state and ISO in the full national queue index.

Key Findings

• Solar accounts for 54 of Arizona's 72 queued projects, a 75.0% share of the count.

• Arizona's interconnection queue totals 32,962 MW across 72 projects, according to the sealed interconnection-queue snapshot.

• 65.3% of Arizona's queued projects have withdrawn, versus 43.6% across the full edition.

• The largest project in the entire edition, ATLAS COMPLEX at 3,200 MW, sits in Arizona.

• CAISO's queue accounts for all 72 of Arizona's projects, according to the sealed interconnection-queue snapshot — none of Arizona's count falls under a second regional operator.

Arizona Queue at a Glance, July 9, 2026

A 300 MW median against a 32,962 MW total shows this queue is not built from small proposals — even the typical Arizona project is sizable, and the 3,200 MW ATLAS COMPLEX entry towers over that median more than tenfold. That single project is also the largest of any state in this edition, which makes Arizona's queue a genuine outlier on top of its already-heavy solar tilt.

Arizona's largest project, ATLAS COMPLEX, carries 3,200 MW.

Arizona's 65.3% withdrawn share is the figure to weigh before reading the fuel mix below — nearly two out of three projects ever filed for this state have already dropped out, so the 72 remaining is a filtered, not a complete, view of everything that has been proposed.

Arizona's snapshot reports only withdrawn and still-in-queue statuses, with no operational or unknown-status rows in this edition — 47 withdrawn plus 25 in queue accounts for the full 72. That two-bucket split is itself worth noting: some state feeds in this same edition report operational counts or unknown-status rows, and Arizona's absence of either simply reflects what its underlying ISO feed publishes, not a claim that no Arizona project has ever reached commercial operation.

The Fuel Mix

Arizona's queue is grouped into the same six technology buckets used across every state in this edition — Solar, Battery Storage, Wind, Natural Gas, Hybrid, and Other — built from vendor labels that differ by ISO and standardized by keyword, not by our research team independently verifying each project's equipment.

Solar holds a 75.0% share of Arizona's queue by count.

Solar

Solar is not just the largest category in Arizona's queue — at 54 of 72 projects and 21,760 MW, it is close to the entire story. A 75.0% share by project count means three out of every four filings in this state are solar, a concentration well above the 33.8% Solar share that tops the full national edition. Arizona's solar resource and existing utility-scale development base likely explain part of that gap, though this report only measures what has been filed, not why developers chose to file it.

A state whose queue runs the other way is Colorado, led by Hybrid rather than Solar at the top of its own count.

Battery Storage

Battery storage holds 16 projects and 10,352 MW, the second-largest category by both count and capacity. That capacity figure is worth pausing on: 16 storage projects carry nearly half of what 54 solar projects carry, meaning individual battery filings in this queue tend to run noticeably large relative to the typical solar entry — a pattern consistent with paired solar-plus-storage development, even though this edition's keyword-based bucketing counts Solar and Battery Storage as separate line items rather than combined hybrid filings.

Battery storage carries 10,352 MW across 16 Arizona projects.

Solar and Battery Storage are, by a wide margin, the two categories carrying this queue. That leaves only the single Natural Gas and single Wind entries described below to fill out the rest of the count, underscoring just how concentrated this state's queue has become around two renewable-adjacent categories rather than a broad mix of technologies.

Natural Gas and Wind

Natural gas and wind each hold exactly 1 project in Arizona's queue — 550 MW and 300 MW respectively. That is the flip side of the solar concentration above: with 75.0% of the count sitting in one category, there is little room left for anything beyond a token entry in most of the others, and wind in particular is nearly absent from a state where solar so thoroughly dominates.

A single-project category is fragile in a way an aggregate statistic is not — if that one natural-gas or wind filing withdraws or advances, the entire category's count changes overnight. Read Arizona's Natural Gas and Wind rows as individual project records, not stable trends.

How Arizona Compares

All 72 of Arizona's projects sit inside CAISO's footprint, a much larger system running 2,278 projects and 492.2 GW across its full territory, with a 77.0% withdrawn share and Solar as its own top fuel at a 46.1% share. CAISO's own Solar lead is real, but Arizona's 75.0% share still runs far ahead of the wider system it reports through.

Against Nevada's 104-project, 27.0 GW queue, Arizona carries more total capacity on fewer projects, consistent with its larger 300 MW median. Both states share Solar as their top fuel, but Arizona's 75.0% share is a far more extreme concentration than a typical desert-Southwest solar lead. The national queue index puts the edition-wide Solar share at 33.8%, meaning Arizona's queue is more than double the national concentration in its own dominant category.

Colorado, by contrast, sits at the opposite end of this edition's fuel-mix spectrum: its own queue is led by Hybrid, not Solar, at the top of its own count. Placing the two side by side shows how differently two states' queues can be composed even under the same six-bucket methodology.

Methodology

All figures in this report are computed directly from US Tech Automations' sealed daily grid-queue snapshots; nothing is estimated, modeled, or extrapolated. Fuel and status labels are grouped from each ISO's own categories: vendor fuel and technology labels differ by ISO and are grouped into Solar, Battery Storage, Wind, Natural Gas, Hybrid and Other by keyword — a research bucketing choice, not an official ISO taxonomy.

Each ISO publishes its own status taxonomy; statuses are grouped into withdrawn, operational (explicitly in-service or commercial operation), still-in-queue, and unknown for feeds that publish no status. Some ISOs drop withdrawn projects from their feed entirely; Arizona's feed does retain them, which is why its 65.3% withdrawn share is visible at all.

A queue position is a request to connect, not a built, approved, or financed project — interconnection queues are aspirational, and a large share of projects nationally withdraw before construction. This report is cross-sectional: it reflects one sealed snapshot date, July 9, 2026, not a trend over time.

The snapshot is produced through a fixed pipeline:

1. Collect. Pull each covered ISO/RTO's published interconnection-queue feed on a daily cadence.

2. Normalize. Standardize project names, fuel labels, and status values against each source's own published taxonomy.

3. Bucket. Group fuel labels into the six technology buckets and status values into the four status buckets described above.

4. Seal. Content-hash the normalized snapshot so every figure in this report traces back to one immutable daily capture.

Frequently Asked Questions

Q: Why is Solar 75.0% of Arizona's interconnection queue?
A: The sealed snapshot shows 54 of Arizona's 72 queued projects bucketed as Solar, a 75.0% share of the count — well above the 33.8% Solar share that tops the full national edition. This report measures what has been filed, not the underlying reasons developers chose solar.

Q: What does it mean for a project to be "queued to connect" in Arizona?
A: It means a developer has filed an interconnection request with a grid operator covering Arizona, asking for a study and eventual physical connection to the transmission system. It does not mean the project has permits, financing, or a construction date — 72 such requests exist in the sealed snapshot.

Q: Does Arizona's 65.3% withdrawal rate mean the state is a bad place to build?
A: Not necessarily — a high withdrawal share is common across interconnection queues nationally (43.6% across the full 12,260-project edition) and often reflects speculative filings or developers moving to a more advanced queue position rather than a verdict on the state's grid.

Q: Is the largest project in this entire edition really in Arizona?
A: Yes. ATLAS COMPLEX, at 3,200 MW, is Arizona's largest queued project and also the largest single project across the full 12,260-project, 36-state edition covered by this snapshot.

Q: Is Arizona's queue split across more than one grid operator?
A: No. The sealed snapshot attributes all 72 of Arizona's projects to CAISO, with none falling under a second regional operator.

Put Grid Data to Work

Arizona's queue data fits a narrow set of buyers with a real, recurring reason to watch it. Project developers siting the next solar or storage filing can use the 75.0% Solar share and the 300 MW median as a baseline for how crowded and how concentrated this specific queue already is before filing. EPC contractors and equipment suppliers reading demand can watch the fuel mix — Solar's 54-project lead over every other category combined — to decide where to route panel, inverter, and interconnection-equipment sales effort.

Utilities and policy researchers tracking regional grid planning can use the CAISO-only attribution and the 65.3% withdrawn share to understand how much of what gets filed in this state actually survives to a later queue stage. Analysts benchmarking one desert-Southwest queue against another can lean on the 75.0% Solar share and the 3,200 MW ATLAS COMPLEX entry as fixed reference points that will not shift between snapshots, even as the surrounding project count does.

Each of these is a recurring monitoring job, not a one-time read: queue snapshots change as projects advance, withdraw, or move status, and the value is in catching the next change, not just this one.

US Tech Automations automates that monitoring — watching feed changes across ISOs, routing the resulting signals, and drafting outreach off them — so a team does not have to re-pull and re-normalize six ISO feeds by hand every week. See the platform for agentic workflows built around exactly that kind of recurring data-monitoring task.

Source: US Tech Automations Research — computed from the sealed daily interconnection-queue snapshot, July 9, 2026.