SpaceX's Proposed 6-Gigawatt Arizona Data Center Campus: What the Cochise County Filing Shows

SpaceX has been confirmed as the company behind a proposed data center and battery storage campus in Cochise County, Arizona, with a stated power demand of about 6,000 megawatts at full buildout. KJZZ reported on November 10, 2026 that the campus covers about 750 acres and would be SpaceX's first facility in Arizona if approved. The reporting does not say what it would cost, and local opposition is already organized. This post separates the figures that are reported from the ones that are not, and adds arithmetic to put the scale in context.

What is reported

The figures below come from two sources. KJZZ is the first-hand report for the size, power and related-project details. The permit-application and meeting details come from an Arizona Daily Star report as summarized by FourWeekMBA, which says it drew on the Arizona Republic and did not itself read the application. Those details are therefore second-hand and should be confirmed against the filing.

• Developer and size. Tombstone Resources LLC is the applicant, and KJZZ reports it will buy another 348 acres from Southline Transmission LLC to complete the campus. The site is near the Willcox Playa, roughly 80 miles east of Tucson.
• Power. About 6,000 megawatts at full buildout. Electricity would come through the Sulphur Springs Valley Electric Cooperative and Arizona Electric Power Cooperative, and the application reportedly includes $3.6 billion in grid upgrades.
• Water and cooling. The application reportedly describes dry cooling and no industrial groundwater pumping, with an existing well supplying up to 10 acre-feet a year for potable use, maintenance and equipment cleaning.
• Economic claims. SpaceX's presentation reportedly cites about 1,000 permanent jobs and a one-time $250 million sales tax benefit to the county, plus an estimated $35 million to $103 million in sales tax revenue.
• Process. A special use authorization application was reportedly filed on October 30. A community meeting on November 4 drew nearly 300 people, and a Planning and Zoning Division public hearing is reported for December 9.

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Putting 6,000 megawatts in context

The reporting does not state the load factor, so these figures are our own arithmetic and are upper bounds, not forecasts.

Two comparisons come from the reporting itself. The Arizona Republic's power analysis, as relayed by FourWeekMBA, says the campus would need about 2.5 times the power of all data centers in Maricopa County combined if fully built. That is a claim about demand at full buildout, not about near-term load.

The cooling claim deserves a closer read

Dry cooling means rejecting heat through air rather than evaporating water, which sharply reduces on-site water use. The trade-off is generally higher electricity use, because air is a less efficient heat sink than evaporating water, particularly in a hot desert climate. That is a general engineering relationship rather than a figure from the filing, and the application as reported gives no numbers on cooling-related power. It is a reasonable question for the hearing: the water headline and the electricity headline are linked.

Local response

At the November 4 meeting, many attendees reportedly held "No Data Center" signs, and a petition with 2,400 signatures asks the county zoning commission and board of supervisors to deny the permit. The reported concerns split: some opponents cite groundwater, while others weigh jobs and tax revenue. SpaceX representatives reportedly declined to answer media questions. A petition signature count is not a vote, and no county decision has been reported.

How it fits SpaceX's wider build-out

KJZZ places the Arizona proposal beside two other items from the same fortnight. The week after the Cochise meeting, SpaceX announced a roughly $24 billion data center and natural gas project in Texas. Separately, Mississippi environmental regulators found that SpaceXAI began constructing a data center there without necessary permits. Our earlier coverage of the group's compute strategy is in SpaceX AI compute leasing to Anthropic, Google and Microsoft and of its chip plans in the Terafab fab proposal. Taken together, they show a pattern in which siting, power and permitting, rather than chip supply alone, increasingly set the pace of AI capacity.

What to watch

• The December 9 hearing. The first formal public checkpoint reported for the permit.
• A cost and timeline disclosure. Neither is in the reporting reviewed.
• Utility filings. Whether the cooperatives disclose how a 6,000 MW load would be served and what the $3.6 billion upgrade covers.
• Independent verification of jobs and tax claims. Figures from a developer presentation are claims until audited.

Takeaways for AI builders

1. Compute is a permitting story as much as a silicon story. Power interconnection and local approval can bound capacity growth regardless of chip availability.
2. Headline megawatts are ceilings. Actual load depends on phasing and utilization, which filings rarely state.
3. Capacity location affects reliability and pricing. Teams that can route work across several model providers, as platforms like Metir allow, are less exposed to any single region or operator's build-out schedule.

Sources:

• KJZZ: SpaceX is behind proposed data center in Cochise County
• FourWeekMBA: SpaceX pitches 6GW-plus supercomputer campus in Arizona (summary of Arizona Daily Star and Arizona Republic reporting)
• Bureau of Land Management Arizona photo of the Willcox Playa, via Wikimedia Commons

Image credits

• Willcox Playa National Natural Landmark: Bureau of Land Management Arizona, public domain, via Wikimedia Commons.