Why it matters
The strategic read
Adds a rare primary-source permitting receipt for a gigawatt-class, off-grid AI campus. Prometheus is trying to solve the three biggest siting bottlenecks at once: power by using an islanded gas microgrid, interconnection risk by avoiding the public utility grid, and water risk through closed-loop liquid cooling. The unanimous Uinta County approval moves the project past a visible community/permitting gate and gives the Deal Room another data point on how developers are packaging local benefits, ratepayer protection and water discipline around AI-scale load.
Source-supported terms
What was disclosed
- 01
Prometheus Hyperscale announced on June 17, 2026 that it received unanimous Conditional Use Permit approval from the Uinta County Board of Commissioners for its flagship campus near Evanston, Wyoming.
- 02
The 506-acre site is designed for 1.25 GW of initial capacity with a development path to 5 GW.
- 03
Prometheus said the campus will operate as a fully islanded microgrid using high-efficiency natural-gas engines and turbines, with no draw on the public utility grid.
- 04
Prometheus said the grid-independent design eliminates interconnection queue exposure and ratepayer impact as regulatory risk factors.
- 05
The company said the facility will use closed-loop liquid cooling with no draw from local water supplies and total campus water consumption projected at about the equivalent of 15 homes annually.
- 06
Prometheus cited University of Wyoming Center for Business and Economic Analysis projections of $3.1B in economic impact through 2032, $184M in state tax revenue during construction and $53M annually once operational.
- 07
Construction is anticipated to begin within six months of final permitting, with the full 1.25 GW campus expected to be built out in phases over 48 to 60 months.
- 08
Prometheus said the Evanston campus is the first of multiple sites in development, including Falls Ranch near Casper designed for up to 1.25 GW in partnership with Casper Carbon Capture and a Texas project with ENGIE and Conduit Power near the I-35 corridor.
- 09
KPCW reported on June 19 that Uinta County commissioners unanimously voted to permit the AI data center after public pushback and town-hall engagement.
- 10
KPCW also reported that the project is roughly 12 miles east of Evanston and that Prometheus says it will not draw water from the nearby Bear River.
Disclosure boundary
What is known—and what is not
Primary Prometheus announcement plus local KPCW confirmation of the Uinta County vote. Public materials disclose the CUP approval, county authority, acreage, initial and expansion capacity, islanded natural-gas microgrid concept, cooling/water posture, economic-impact estimates, expected post-final-permit construction timing and phased buildout plan. Public materials do not disclose final financing, customer/offtake identities, tenant leases, gas-supply contracts, generator/EPC awards, air permits, final construction permits, detailed water permits, interconnection or backup arrangements, power costs, server/GPU allocation, delivery remedies or final phase schedule.