Microsoft has received preliminary approval to install 128 diesel generators across its data center sites in Cheyenne, Wyoming, local reports say.
The Wyoming Department of Environmental Quality (DEQ) announced its initial decision to approve the permit in April. The agency is currently inviting public comments on the plan. The proposal includes not only the diesel generators but also storage tanks that will hold more than 1.8 million gallons of fuel.
The public can submit their comments until May 21. A public hearing will only be held if a formally “aggrieved party” requests it, the DEQ said.
Cheyenne Mayor Patrick Collins explained that the generators will serve as backup power. They will activate if the main power supply is interrupted for any reason. It remains unclear whether the generators will be able to run on low-carbon diesel alternatives, such as hydrotreated vegetable oil (HVO) or hydrogen-based fuels.
The permit sets limits on emissions of certain pollutants. These include nitrogen oxides (NOx), sulfur oxides (SOx), and volatile organic compounds (VOCs). These pollutants can cause ozone and haze, according to documents filed with the state.
Mayor Collins also shared that Microsoft plans to build four new data center facilities in the Cheyenne area.
Microsoft has operated data centers in Wyoming since 2012. It expanded its presence in 2014 and opened the West Central Azure region in 2016.
In 2021, Microsoft opened two new data centers in Cheyenne. One is located in Cheyenne Business Parkway and the other in Bison Business Park.
Earlier this year, Microsoft worked with Caterpillar, a power equipment manufacturer, on a pilot project. They tested the use of hydrogen fuel cells to provide backup power to a data center for 48 hours.
The project was successful. It used a large hydrogen fuel cell system to power Microsoft’s Cheyenne facility during a simulated two-day backup power event.
