Arizona Data Center Projects: Certification Deadlines, Power Terms and Local Rules

ARS 42-5061(B)(23) exempts computer data center equipment sold to the owner, operator or qualified colocation tenant of a center certified under ARS 41-1519, during the qualification period, for use in that center. The terms carry the meanings in ARS 41-1519, where the equipment definition includes equipment affixed to or incorporated into real property, equipment for the transformation, generation, distribution or management of electricity and equipment to cool and maintain a controlled environment.

Construction materials are not listed in that equipment definition as read for this page, so the general contractor's purchasing and tax treatment of materials is a question for the project's tax advisers. On the insurance side, switchgear, transformers, generators and cooling plant are often long-lead items the owner buys, and builders risk and installation coverage typically need to value them while they are stored, in transit and being installed.

On December 3, 2025, the Arizona Corporation Commission voted 4-1 in Docket E-01933A-25-0187 to approve a 10-year energy supply agreement between Tucson Electric Power and a data center campus in Pima County. The Commission's release says the agreement includes minimum monthly billing requirements and that the customer will be financially responsible for all costs related to building new infrastructure, including the line extensions and new switchyard. It lists termination fees and minimum billing payments among the protections for other customers.

That is one approved agreement, and each project's own agreement controls. The release does not state letter of credit or collateral terms, and this page states none. In a separate generic docket, E-00000A-25-0069, an April 2026 Commission workshop heard utility proposals for an extra high load factor rate and standard contracts requiring up-front financial support from data center customers; at last check that was discussion, not an adopted tariff.

Salt River Project, which also serves large loads in the Phoenix area, runs its own queue process according to the Commission's April 2026 workshop summary, so developers in its territory confirm large-load terms with SRP directly. This page states no SRP terms. Utility security, minimum bills and termination fees are financial obligations, not insurance.

In a release dated July 2, 2025, the City of Phoenix said the Council approved zoning ordinance updates adding data centers as a permitted use, with a special permit process addressing health and safety impacts. The adopted code wording was not read for this page, so the numbers below come from the staff-proposed text in the May 1, 2025, staff report for Z-TA-2-25-Y, which the report says may be modified during the hearing process. Confirm the adopted wording with the city before relying on any of them.

As proposed by staff, preliminary site plan approval would wait until a local utility confirms in writing that it can serve the energy demand within two years. Within 300 feet of residential property, noise could not exceed existing ambient levels by more than 5 percent, with a third-party acoustical study, and a final certificate of occupancy would not issue if that limit were exceeded. Mechanical equipment, including transformers and generators, would be set back at least 150 feet from right-of-way or residential zoning, and overhead utilities in abutting right-of-way would be placed underground.

• Staff-proposed noise test tied to the final certificate of occupancy
• Staff-proposed 150-foot setback for transformers and generators
• Staff-proposed undergrounding of overhead utilities in abutting right-of-way

Tucson's March 5, 2026, community meeting presentation on data center zoning says an ordinance adopted in August 2025 created a Large Quantity Water User Program for new water connections and meter upsizing requests. It applies to any customer projected to use 10,000 ccf or more and requires a Sustainable Water Service Application and a Water Conservation Plan, and the plans must be approved by Mayor and Council. A data center needing that much water typically has to fit that approval into its schedule.

The same presentation describes data center zoning standards, including noise studies and limits on potable water for cooling, as a proposed code amendment. They were still proposed at last check, so confirm their status with the city.

The certification clock turns delay into a tax question for the owner. Owners commonly respond with liquidated damages, performance bonds and delay in startup or soft cost cover sized to the investment deadline, and builders risk terms and extension options are worth matching to the schedule. Insurance does not respond to a missed investment threshold or tax recapture; delay cover, where written, responds only to insured physical loss under the terms of the policy.

A certificate of occupancy tied to a noise test, as in the Phoenix staff text, can put acoustic design and mitigation rework on the critical path, which raises design professional and completed operations questions for the general contractor and mechanical trades. Right-of-way undergrounding brings public-way work and its own permits. Generator fuel storage and testing add pollution exposure. Whether a surety will support the bonds and on what indemnity, and what terms carriers offer, typically varies by carrier guidelines, programs, project and individual risk, subject to underwriting and the terms of the bonds and policies issued.