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Joule Energy and Data Center Campus

McCornick, Millard County, UT

Also known as Joule Capital Partners Millard County campus, Joule HP Compute Campus

Under constructionGroundbreaking held November 6, 2025; developer targets first power in 2026. Published capacity ranges from 1 GW to 12 GW
  1. Rumored
  2. Proposed
  3. Approved
  4. Under construction
  5. Operating

Joule Capital Partners is building an off-grid, gas-powered data center campus on about 4,000 acres of former farmland in Millard County, between Fillmore and Delta. The county commission approved rezoning in August 2025 and a groundbreaking was held in November 2025. Published capacity figures differ widely, from about 1 GW in state applications to 4 GW in Joule's earlier statements and 12 GW at full build-out in a third-party report. No tenant has been named.

Site size
4,000 acres

Key facts

Size & schedule

Planned capacity1 GW [4]
about 1 GW to start, per Joule applications filed with the state (Lehi Free Press)
Planned capacity4 GW [2]
4 GW at full build-out, as reported when the project was announced (Power Engineering)
Planned capacity12 GW [5]
12 GW at full build-out, with 1.4 GW by 2027 and 5.8 GW by 2029, per Cleanview; not found in a Joule document that was opened
Site size4,000 acres [1]
Target completionPower slated to begin in 2026 (ABC4); Cleanview reports a first 455 MW targeted for Q4 2026 [1]

How big is that? Data center sizes compared with football fields and Central Park.

Power

Power supplyOff-grid natural gas: Caterpillar G3520K generator sets plus 1.1 GWh of battery storage [2]

Water

CoolingDeveloper cites the site elevation for cooling efficiency [1]

Figures are as stated by the cited source. Where sources disagree, each figure is shown.

Water and power

Water

Not disclosed. No source reviewed gives a water figure for this site. The Census does not estimate one.

Power

Planned capacity1 GW [4]
Power supplyOff-grid natural gas: Caterpillar G3520K generator sets plus 1.1 GWh of battery storage [2]

Disclosed figures only, each as the cited source states it. Many are projections or permit limits, not metered use. How data center water and power use is measured, and every disclosed figure →

Timeline

  1. Millard County Commission unanimously approves rezoning the parcel from agricultural to heavy industrial use [5]

  2. Caterpillar announced to supply generator sets for a 4 GW campus [2]

  3. Groundbreaking held for the campus [1]

  4. Residents and critics say few environmental studies were done; a commissioner says the projects will stay within existing water rights [3]

Issues raised

  • A critic told KUTV that no environmental studies have been done; a county commissioner said the projects will not exceed existing water rights [3]

Issues are concerns and claims raised by the parties, officials or residents named in the cited sources. They are reported as attributed, not as findings by the Census.

Sources

  1. Groundbreaking held for country's largest data center in Millard County
    ABC4 Utah · Nov 6, 2025 · news
  2. Caterpillar to support multi-gigawatt data center project in Utah
    Power Engineering · Aug 8, 2025 · news
  3. 'Screaming into the void' over two data centers in central Utah
    KUTV · Jun 3, 2026 · news
  4. Utah's massive data centers seek to build new power sources
    Lehi Free Press · Feb 11, 2026 · news
  5. Joule Utah
    Cleanview · 2026 · other

Cite this page

Last updated Oct 15, 2026. Figures may change as records are updated — include the date you retrieved them.

APAData Center Census. (2026). Joule Energy and Data Center Campus. Retrieved from https://datacentercensus.com/dc/joule-energy-and-data-center-campus-millard-county-ut
MLA“Joule Energy and Data Center Campus.” Data Center Census, Oct 15, 2026, https://datacentercensus.com/dc/joule-energy-and-data-center-campus-millard-county-ut.
Linkhttps://datacentercensus.com/dc/joule-energy-and-data-center-campus-millard-county-ut

Republishing a figure or table? Attribute it to Data Center Census with a link to this page. The underlying data is downloadable as JSON and CSV; the press kit has standing figures and contact details.