Microsoft arrived in Cheyenne in 2012. It now has 11 data centers planned in Wyoming. Meta is building an AI data center in Cheyenne. OpenAI and Crusoe have regional plans. Prometheus Hyperscale, led by CEO Trenton Thornock, is also in the Cheyenne market. The collective investment in this buildout is operating against a backdrop of $756 billion invested in AI infrastructure globally in the current year, with $1.6 trillion projected by 2031.
The scrutiny in Wyoming focuses on water. The state sits on a finite and politically sensitive water supply. Current Cheyenne data centers draw approximately 200 acre-feet annually, representing 1.48 percent of city consumption. Developers project the combined new center footprint reaching 400 acre-feet annually at full build, about 3 percent of current use and 1.8 percent of Wyoming's 22,000 acre-feet available.
Thornock's case for Prometheus Hyperscale's low water draw rests on a closed-loop propylene glycol-water cooling system. The claim: the loop requires a refill cycle once every six years, and the volume of water required for that refill is equivalent to what eight single-family homes consume. Republican state representative Gary Brown of Cheyenne was publicly skeptical. One representative acknowledged the technical claim while noting that the infrequency of consumption is what makes the architecture different from evaporative cooling systems.
A closed-loop propylene glycol system is a real architecture. Closed-loop liquid cooling with glycol inhibitor does reduce water consumption to near-zero ongoing draw, with top-off intervals measured in years rather than daily evaporative loss. The question is whether the Prometheus facility actually runs that architecture at the scale being proposed, and whether the six-year refill cycle holds at AI rack densities as heat loads increase over the operating life of the facility. Those are engineering verification questions, not rhetorical ones.
The water question is the one getting public attention. The power question may be more consequential. Microsoft and Prometheus together could demand electricity in excess of double Wyoming's existing grid capacity. The state's grid absorption problem mirrors what other states are encountering as AI buildout load accelerates. Wyoming's existing capacity is not sized for two hyperscalers plus the existing industrial load.
Cheyenne Mayor Patrick Collins supports the development. The Wyoming Outdoor Council has warned about regulatory gaps. The Legislature's Select Water Committee is taking up the data center water question again in August. The National Center for Atmospheric Research has operated a supercomputer facility in Cheyenne for years, which provides some local precedent for high-density computing infrastructure. It does not provide precedent at the scale of 11 Microsoft campuses.
Cooling architecture choice is the variable that separates operators who can make credible water stewardship claims from those who cannot. A closed-loop system at verified low water intensity is a legitimate claim. An evaporative cooling tower at AI density in a water-stressed state is not. The difference matters more in Wyoming than it does in a jurisdiction with surplus water, because here the claim is being made to a legislature that controls the water rights.