Rancho Sahuarita data center, in order
What happened with this project, oldest first: the stages it reached, what the county and its cities decided, and every dated step on the record. Each entry links its source.
7 events, August 2025 to September 22, 2026. Also on the record, under the month each belongs to: 1 statement, 3 figures from other sources and 24 lines that are not events of their own. The facts, newest first: the record; the place: Arizona.
A plain date is the day it happened, as the source states it, or as the line's own sentence states it ("voted on July 6"), which is where the line sits even when it was filed later. "Reported" and a date is the day a source published a line that carries no date of its own. Those lines, and lines that describe rather than report an act, sit under their month rather than on the timeline, with what was said and the figures other sources gave. Every timeline on the site reads its lines by this one rule. How dates are read.
Stages
2025 2 events
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(the month its own sentence names; no day is given; filed under Dec 10, 2025)
Entry
The contract was filed with Arizona's utility regulators in August [3]
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(source date; the content gives no date of its own)
reported
Agreement will allow TEP to provide electricity to the planned data center in Pima County, starting in 2027 [3]
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Also in December 2025: 1 statement, 1 figure from another source and 1 line that is not an event of its own
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(source date; the content gives no date of its own)
Entry
The 10 year long agreement includes monthly billing requirements at the same standard rate as other large customers [3]
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(said in the source itself)
Statement · Rachel Walden, Arizona Corporation Commission
Rachel Walden was the lone nay vote AZPM News local outlet
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(source date; the content gives no date of its own)
Figure · AZPM News
286 MW: By 2028, TEP will be providing as much power to the project as it would take to cool 57,000 homes, about 286 megawatts AZPM News local outlet
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2026 5 events
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(content date)
Decision · Pima County (county)
At Aug. 11 meeting, supervisors voted 3-2 to draft the moratorium language, with Supervisors Rex Scott and Steve Christy voting no. tucson.com
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(content date)
Decision · Pima County (county)
On August 12, the Pima County Board of Supervisors voted 3-2 to begin drafting a temporary, three month halt on data center development thecooldown.com
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(content date)
Decision · Pima County (county)
On Aug. 26, Pima County Board of Health passed unanimous motion advising supervisors to adopt the 120 day moratorium to prevent irrevocable public harm. tucson.com
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(content date)
Decision · Pima County (county)
Pima County Board of Supervisors voted Tuesday to approve a temporary moratorium on data center development in unincorporated parts of the county for 120 days kjzz.org
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(the weekday its sentence names, the last before the report; filed under Sep 23, 2026)
Decision · Pima County (county)
Pima County Supervisors approved a 120 day data center moratorium with a 3-2 vote on Tuesday (September 23, 2026), with Supervisors Steve Christy and Rex Scott opposing. azluminaria.org
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Also in September 2026: 2 figures from other sources and 23 lines that are not events of their own
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Pima County released a 20 page review on the potential human health effects of large data centers with Johns Hopkins Bloomberg School of Public Health thecooldown.com
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(source date; the content gives no date of its own)
Figure · Yahoo
15 percent: 15% of adults in Pima County have asthma and almost 36% have been diagnosed with high blood pressure Yahoo local outlet
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(source date; the content gives no date of its own)
Figure · Yahoo
6 percent: Data centers devour 6 percent of U.S. electricity as AI demand accelerates Yahoo local outlet
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Potential 120 day moratorium on all data center development activity while county hammers out code amendment changes. tucson.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Second policy revamps when an environmental review is triggered, such as when an NDA is signed or a developer expresses interest. tucson.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
First policy added new guidelines to the county's use of non disclosure agreements, including shortening duration and limiting who can sign. tucson.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Pima County Board of Supervisors passed two policies governing future economic development projects following Project Blue data center. tucson.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Amazon sought to restrict what officials in Pima County, Arizona could publicly discuss regarding a proposed $3.6 billion data center project newsweek.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Board approved both policy adjustments 4-1, with Supervisor Steve Christy voting no tucson.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Pima County expanded environmental review policy to include large water and electricity users, defining large water users as those estimating use of 10,000 centum cubic feet or above tucson.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Pima County set the initial term length for NDAs at six months with Board approval required for extensions tucson.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Pima County shortened the maximum length of an NDA from five years to two years tucson.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Pima County Board of Supervisors passed updates to policies on non disclosure agreements and environmental review standards for large scale economic development projects tucson.com
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(source date; the content gives no date of its own)
Entry
Town has not received applications for a data center project as of Wednesday prior to September 11, 2026 [2]
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(source date; the content gives no date of its own)
Entry
Developer sent letter to town planning and zoning director asking if data centers could be permitted [2]
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(source date; the content gives no date of its own)
Entry
A 168 acre area of property south of Rancho Resort would be affected by the development [2]
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(source date; the content gives no date of its own)
Entry
Proposed data center covers 221 acres of desert designated Region 8 [2]
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(source date; the content gives no date of its own)
Decision · Sahuarita (city)
Residents opposed planned data center during Sahuarita council meeting on August 10 tucsonsentinel.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
The Planning and Zoning Commission is scheduled to review proposed zoning changes on October 28, 2026. kvoa.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Pima County proposed zoning code changes (Title 18) to define data centers, establish formal development review process, and set design and development standards including noise studies, mitigation plans, and Conservation Lands System compliance. kvoa.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
The Pima County Board of Supervisors scheduled a vote on a temporary moratorium on data center development to allow staff time to finalize regulations. kvoa.com
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(source date; the content gives no date of its own)
Decision · Pima County (county)
County staff will work with stakeholders and health department, make recommendations to Planning and Zoning Commission in October, and propose new zoning regulations by end of 120 day moratorium period. azluminaria.org
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Supervisor Matt Heinz asked the board to direct the health department to keep collecting data on public health impacts of data centers and create a risk assessment matrix; approved 3-2. azluminaria.org
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(source date; the content gives no date of its own)
Decision · Pima County (county)
Moratorium applies to any data center development where permits have not yet been submitted; does not affect Project Blue; could impact possible projects in Sahuarita. azluminaria.org
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(source date; the content gives no date of its own)
Decision · Pima County (county)
The resolution passed 3-2 with 120 day validity and possibility of extension kjzz.org
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On the timeline: a stage change; an entry that reports an act on the day the source or its own sentence gives; and a decision, a published scorecard event on a row at or under the record's county, that reports an act. Under the months: a statement that names this record, a figure another source gave about it, matched by place and developer, an entry dated only by the day its source was published, and an entry or a decision that describes rather than reports an act. Each is on the record in its own right and keeps its own link.
For researchers
- Slug
- rancho-sahuarita-data-center-az
- Status value
- rumored
- Events on the timeline
- 7
- Under the months
- 28
- Stage changes
- 1
- Decisions
- 24
- Statements
- 1
- Figures
- 3
- Entries and decisions under the months
- 24