Tucson Tightens Oversight Of Large-Scale Data Centers

Tucson residents will have a formal opportunity to weigh in on proposed large scale data centers under new city regulations approved by the Mayor and Council. The rules address concerns that could affect nearby neighborhoods and the broader community, including facility noise, water consumption, electricity demand, land use and environmental impacts. They take effect Sept. 4, giving Tucson a framework for reviewing a type of development that previously had no regulations written specifically for it.

The Mayor and Council approved the regulations in a 6-1 vote Aug. 5, following roughly a year of work. The process included community engagement, consultation with technical experts and review by the Planning Commission. City officials described the result as placing large scale data centers among Tucson’s most heavily regulated land uses. The new standards are intended to give residents and local officials more information and decision making authority as interest in these facilities grows nationally.

Under the rules, developers would use the city’s existing Planned Area Development or Planned Community Development zoning processes. A proposal would involve coordination with neighborhoods, a public hearing, review by the Zoning Examiner and final consideration by the Mayor and Council. That sequence means a project could not move ahead solely through an administrative approval. Residents would have multiple points at which to examine plans and raise concerns before a final decision.

The regulations also require more distance between data centers and residential areas, commercial and office properties, and other sensitive locations. Applicants must evaluate possible sound impacts, install noise barriers and meet operating noise limits. These requirements are aimed at reducing the effects of facilities that may run continuously and contain large equipment. Noise has become a significant issue in debates over data center construction because sound can affect people living nearby as well as wildlife.

Water and electricity supplies are also central to the new Tucson standards. Before a proposal advances, the developer must demonstrate that adequate water and power would be available. Applicants must disclose their planned energy mix, including the portion expected to come from renewable sources. The rules further require environmental reviews, increased green space and open space, and substantial landscaping around facilities. In some cases, the Mayor and Council may permit developers to protect sensitive land off site at a ratio of two acres for every one acre affected.

The city’s approach reflects a broader debate over the benefits and costs of data centers. These facilities support cloud computing and the expansion of artificial intelligence, but they can require enormous amounts of electricity and place pressure on power systems. Depending on how they are designed and where they are built, they can also affect water supplies, air quality, wetlands and other natural resources. Their equipment may produce continuing noise, creating concerns for both residents and surrounding ecosystems.

Kentucky provides another example of governments trying to respond to those pressures. On Aug. 6, Gov. Andy Beshear issued an executive order increasing state oversight of data center development while leaving local governments in charge of deciding where facilities may be built through zoning. Under that order, applicants must provide detailed energy plans showing that a project would not increase household electricity costs. They must also demonstrate compliance with environmental requirements and pay their share of state, local and school taxes.

The Kentucky order adds disclosure and utility protections that are separate from Tucson’s local zoning rules. Companies there must clearly provide communities with proposed locations, project details and information about job opportunities. The Kentucky Public Service Commission was directed to block utility rate increases tied to data center operations. The state Energy and Environment Cabinet must deny a permit if a project would harm air quality, water resources, wetlands or other natural resources. More than 30 Kentucky communities have already adopted moratoriums or ordinances limiting data center construction, showing how widely local governments are confronting the issue.

For Tucson, the immediate change is the creation of a public review structure and a set of standards that developers must meet before a large scale data center can proceed. The regulations do not eliminate development, but they require projects to account for neighborhood separation, sound, water, electricity, environmental conditions and landscaping. As national demand for computing infrastructure continues to grow, Tucson’s rules give the city a defined process for balancing possible economic benefits with the effects these large facilities could have on residents, utilities and natural resources.