Arizona Market

Market Deep Dive

Phoenix: The #2 Proposed Data Center Market in North America

Metro Phoenix has become the second-most-active market in North America for proposed data center development, drawn by abundant land, a business-friendly environment, low natural-disaster risk, and room to build large solar-plus-storage campuses. The two dominant utilities are Arizona Public Service (APS) and Salt River Project (SRP). Industry tracking indicates APS alone has roughly 16,000 MW of data center demand in its interconnection pipeline, and that data centers accounted for ~94% of APS demand growth from 2023 to 2025.

The scale of individual requests has stepped up sharply. APS notes that the average data center in its territory now needs about 400 MW (equivalent to ~64,000 homes), with some requests reaching 2,000 MW. Phoenix capacity is projected to grow several-fold over the coming decade, with some industry forecasts calling for roughly 5,300+ MW of new data center load.

Sources: APS, "Data Centers: How We're Protecting Customers" (2026); Atrium Data / industry tracking (Mar 2026).

Project Pipeline: Hyperscalers, Chip Fabs, and Powered-Land Plays

Arizona's data-center story is inseparable from its broader industrial build-out. The anchor is TSMC Phoenix, where the Taiwanese chipmaker lifted its total Arizona commitment from $65 billion to $165 billion in March 2025, expanding the plan to additional fabs plus advanced-packaging facilities — a semiconductor cluster whose fabs and suppliers are themselves multi-hundred-MW loads. Around it, hyperscale and wholesale developers have assembled one of the deepest project benches in the country.

Hyperscale footprints are now statewide. Meta is developing a Mesa campus widely reported at roughly $800 million Probable, Microsoft has accumulated major land positions in Goodyear and El Mirage for cloud/AI campuses, and Google operates a large campus in Mesa with expansion plans on file. Wholesale players QTS and NTT have both bought and powered large Phoenix-area sites, competing with Vantage, Stream, and others for West Valley land. Buckeye and Goodyear sit at the center of this wave because 230 kV-served land is still available there at prices far below Northern Virginia.

Our tracker currently carries one early-stage Arizona project: a 400 MW data center campus in Buckeye paired with significant behind-the-meter solar and battery storage (see Projects). Its stage is Possible — an APS load study was completed in June 2026 and solar-plus-storage PPA discussions are underway — so the MW figure should be treated as directional, not contracted.

Sources: TSMC expansion announcement (Mar 2025); AZ Republic and Phoenix Business Journal reporting on Meta, Microsoft, Google, QTS and NTT (2023–2025); DPD project tracker (Aug 2026).

Rate Design and Cost Allocation

Arizona is following the same cost-allocation playbook as Ohio and Georgia. In its June 2025 rate case to the Arizona Corporation Commission, APS proposed a ~45% rate increase for extra-large energy users and the adoption of formula rates that re-examine the cost to serve each customer class annually. APS is also developing long-term contract structures under which data centers fund the infrastructure they trigger — explicitly so that residential customers do not subsidize the build-out.

• Generation: new gas and solar-plus-storage to serve a peak that could more than double; APS cites Palo Verde nuclear (its 1,150 MW share) as firm clean backbone.
• Transmission: 500 kV / 230 kV expansion into the West Valley (Buckeye, Goodyear) and southeast corridors.
• Policy: ACC rate case on the 45% extra-large-user increase and formula rates; local zoning fights over water and land use.

Sources: APS June 2025 rate case; Arizona Corporation Commission.

APS Deep Dive: A Utility Rebuilt Around Data Center Load

Arizona Public Service, the state's largest utility and the principal subsidiary of Pinnacle West Capital, is being reshaped by a single customer class. APS set an all-time system peak of 9,053 MW on July 24, 2026, well above its 8.7 GW 2025 peak, and its planning documents now describe an uncommitted large-load queue of roughly 19 GW — more than double today's record peak. Industry trackers put the data-center-specific share of that pipeline near 16 GW, with data centers responsible for about 94% of APS demand growth from 2023 to 2025.

The June 2025 rate case is the financial vehicle for this build-out. Beyond the headline ~45% increase for extra-large users, APS asked for formula rates and long-term contract structures requiring large customers to commit to — and underwrite — the generation and network upgrades they trigger. The company's integrated resource plan leans on a three-legged resource strategy: continued Palo Verde output as firm clean capacity, new natural-gas units for evening reliability, and utility-scale solar plus gigawatt-hour-class battery storage, where Arizona leads most of the country.

The IRP's load trajectory is the number to internalize: APS projects peak demand climbing from 8.7 GW in 2025 toward roughly 12.0 GW by 2035 Estimated, and each successive planning cycle has revised the near-term years upward as data-center study agreements convert to construction. To bridge the gap, APS has pursued gas-fired capacity additions, expansions of its battery fleet, and efficiency/demand-response programs aimed squarely at the summer evening peak. Management has also floated the possibility of new nuclear — including small modular reactors — in joint exploration with SRP and other regional utilities, though no SMR project is formally committed Possible.

For investors, the key APS metrics to watch are queue conversion (how much of the 19 GW signs contracts under the new tariff), the cadence of Palo Verde license and uprate decisions, and whether the 12.0 GW 2035 peak forecast keeps ratcheting upward with each planning cycle.

Sources: APS / Pinnacle West investor materials and IRP filings (2025–2026); APS peak-demand releases (2025, Jul 2026).

SRP: The Parallel Territory Absorbing the East Valley Wave

Salt River Project — an unregulated, community-owned utility — serves much of the East Valley and central Phoenix, which means a large share of the metro's data-center growth lands on its system rather than APS's. SRP's record peaks have pushed above 8 GW in recent summers, and its board has approved successive rounds of resource additions to keep pace with data-center and industrial customers concentrated in Mesa, Chandler, and Gilbert.

SRP's resource strategy mirrors APS's but moves faster because it does not need ACC approval for generation decisions. The utility has been adding combined-cycle and peaking gas capacity alongside large battery storage installations, and it signed one of the country's larger utility solar-plus-storage portfolios to serve tech customers with clean-energy commitments. Its Probable data-center pipeline is not publicly disclosed in APS-level detail, but board materials and site-plan filings point to several gigawatts of large-load requests in study.

The practical takeaway for developers: site selection in Phoenix is often an APS-vs-SRP decision, because tariff structure, interconnection timing, and water jurisdiction differ across the two territories. See our Markets page for utility-boundary context.

SRP also brings structural advantages that matter to hyperscalers: no dividend pressure, board-level authority to sign bespoke large-load contracts quickly, and direct control over both water (via the Salt River canal system) and power planning. Its exposure to the East Valley — where Meta, Google, and the Chandler semiconductor corridor sit — means SRP's load-growth percentage could rival APS's even though its absolute queue is smaller. Watch SRP's board-approved resource tranches as the cleanest public proxy for contracted East Valley data-center demand.

Sources: SRP public board meeting materials and integrated resource planning documents (2024–2026); AZ Republic coverage of SRP summer peaks.

Regulatory Landscape: ACC Mechanics and the Large-Load Tariff Fight

The Arizona Corporation Commission is the arena where the state's data-center economics will be set. APS's June 2025 rate case proposes three structural changes: a ~45% rate increase for the extra-large-user class, annual formula-rate resets that trues up cost allocation by class, and contract terms that push minimum-take commitments and collateral requirements onto new large loads. A decision is expected on the standard ACC litigation timeline of roughly 12–18 months from filing Estimated.

The political context is unusually charged. Arizona commissioners are elected, residential rates have already risen with the summer-peak build-out, and the argument that “data centers pay their own way” is the central test of the docket — the same fight that produced landmark large-load tariffs in Ohio and Georgia. Intervenors include large industrial customers, consumer advocates, and clean-energy groups contesting how much new gas the load growth justifies.

SRP, as a public power entity, sits outside ACC rate jurisdiction, which creates a two-speed regulatory environment: APS large-load terms are litigated in public, while SRP sets its own through board votes. Developers doing site selection in Arizona need to model both regimes.

History suggests the outcome will be a negotiated settlement rather than a clean win for either side. APS's prior rate cases have typically ended in settlements trimming the requested increase, and the commission has signaled interest in minimum-demand charges, exit fees, and ramp-up requirements for extra-large customers — the same toolkit adopted in Ohio and Georgia to protect residential ratepayers from stranded-asset risk. The composition of the ACC itself is a live variable: commissioners are elected statewide, and utility rates and data-center growth have become campaign issues in recent cycles.

Sources: Arizona Corporation Commission, APS rate case docket (filed Jun 2025); Utility Dive coverage of state large-load tariff proceedings (2025–2026).

Water, Cooling, and the Desert Constraint

Water is Arizona's defining data-center constraint — and increasingly its policy flashpoint. Phoenix sits in an Active Management Area where groundwater pumping is tightly regulated, and the state's Colorado River allocation has been cut under federal shortage declarations. State groundwater decisions in 2023 already curtailed some residential development reliant on groundwater, signaling how seriously regulators treat long-run supply.

The industry response has been a rapid shift in cooling design. New large campuses in the Phoenix metro overwhelmingly specify dry or hybrid cooling — air-cooled chillers, adiabatic assist only in peak hours, or direct-to-chip liquid loops — cutting water use by an order of magnitude versus legacy evaporative plants, at the cost of higher summer energy draw. Meta, Google, and Microsoft have all publicly framed their Arizona builds around low-water cooling, and municipal approvals in Mesa, Goodyear, and Buckeye now routinely include water-use conditions. Our analysis of data center water consumption covers the trade-offs in detail.

The energy-water trade-off is real: dry cooling raises peak electrical demand on a system that already peaked at 9,053 MW, and hybrid systems still draw water during the hottest hours. Expect cooling design, recycled-water access, and reclaimed-water infrastructure to feature in every major Arizona entitlement fight through the decade.

Sources: Arizona Department of Water Resources groundwater actions (2023); AZ Republic and Bisnow Phoenix coverage of data-center water conditions (2024–2026); company sustainability disclosures.

Transmission, Palo Verde, and Competitive Positioning

Arizona's power anchor is Palo Verde, the largest nuclear plant in the United States at roughly 3.9 GW across three units, operated by APS (which holds a ~1,150 MW share) with SRP and other Southwestern utilities as co-owners. It provides the carbon-free firm backbone that lets both utilities market low-carbon power to hyperscalers. Around it, the state is planning 500 kV and 230 kV expansion into Buckeye, Goodyear, and the southeast corridors, and its ties into the broader Western grid — plus emerging west-wide market integration — give Phoenix multiple import paths during summer peaks.

Competitively, Phoenix's pitch against Texas and Northern Virginia rests on three legs: land at a fraction of NoVA prices, no state-level queue chaos on the ERCOT scale, and a utility pair (APS/SRP) that is actively courting large loads rather than rationing them. Its disadvantages are equally clear: summer peaks that stress the system, water politics, and Dominion-style delivery timelines that, while better than NoVA's, are lengthening as the 19 GW queue works through studies.

The 12–24-month watch items: the ACC ruling on the APS rate case and large-load tariff; conversion of uncommitted queue MW into signed contracts; West Valley transmission approvals; SRP's next resource-plan tranche; and whether TSMC's packaging build-out pulls another wave of supplier load into the queue.

Sources: APS and SRP transmission planning documents (2025–2026); EIA and company data on Palo Verde; CBRE North America Data Center Trends reports (2025–2026).

Outlook

Arizona is positioned to capture demand spilling out of constrained California and to host large solar-plus-storage-backed campuses, but water availability and summer-peak reliability are real constraints in a desert market where the system already peaks above 9 GW. Watch the ACC's ruling on the APS rate case, the pace of West Valley transmission approvals, and how the 19 GW uncommitted queue converts to contracted load under the new cost-allocation regime.