Microsoft Cheyenne Data Center CYS17-CYS22

Under Construction

Profile scope: Campus
Address: 5707 Loving Trail, Cheyenne, WY
Operator: Microsoft

The Microsoft Cheyenne Data Center CYS17-CYS22 is the Bison campus southeast of Cheyenne, Wyoming, in Laramie County, on 249 acres bought from the Lummis family in 2021. Microsoft began planning the campus in 2017. As of August 2026 the city reported a building permit application for the fifth and last building, and one toured building is 250,000 square feet. Cheyenne Light, Fuel and Power Company, doing business as Black Hills Energy, filed for new 115 kV substations to extend service to the campus. Microsoft has not published a campus demand figure.

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Microsoft Cheyenne Data Center CYS17-CYS22

Under Construction

Profile scope: Campus
Address: 5707 Loving Trail, Cheyenne, WY
Operator: Microsoft

The Microsoft Cheyenne Data Center CYS17-CYS22 is the Bison campus southeast of Cheyenne, Wyoming, in Laramie County, on 249 acres bought from the Lummis family in 2021. Microsoft began planning the campus in 2017. As of August 2026 the city reported a building permit application for the fifth and last building, and one toured building is 250,000 square feet. Cheyenne Light, Fuel and Power Company, doing business as Black Hills Energy, filed for new 115 kV substations to extend service to the campus. Microsoft has not published a campus demand figure.

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Overview

Campus power: Not disclosed; No exact-site MW figure in cited sources.
Status: Under Construction; Under Construction
IT floor area: Not disclosed; Campus
Cooling design: Reported; Previous-generation design that uses water only on the hottest days, about 10% of the year

Project scope: A building of 250,000 square feet toured by the mayor; not a campus total
Power and grid: No exact-site power capacity has been disclosed. Reported utility context: Cheyenne Light, Fuel and Power Company.
Cooling and environment: Previous-generation design that uses water only on the hottest days, about 10% of the year.

Toured building

A building of 250,000 square feet toured by the mayor; not a campus total

Final building

Building permit applied for the fifth and last building of the campus, reported August 2026

Power and grid

Utility: Cheyenne Light, Fuel and Power Company
ISO / RTO: SPP
Substation: New 115 kV Sweetgrass Substation and new 115 kV and 24.9 kV Bison Substation
Dockets: Wyoming PSC Docket 20003-201-EN-21, Record 15756, Cheyenne Light Bison service filing

Facility and development

Cooling systems: Previous-generation design that uses water only on the hottest days, about 10% of the year
Air permits: Wyoming DEQ air quality matter F030348/A0015011 for Microsoft Cheyenne Data Center CYS17 - CYS22; comment period closed
Permits and dockets: City site plan for the CYS Bison data center approved June 13, 2023 · City building permit for one data center at 5707 Loving Trail, Clayco, Inc., payment recorded February 8, 2024

Grid record: Cheyenne Light, Fuel and Power Company · SPP · New 115 kV Sweetgrass Substation and new 115 kV and 24.9 kV Bison Substation
Wyoming PSC Docket 20003-201-EN-21, Record 15756, Cheyenne Light Bison service filing
Regulatory record: City site plan for the CYS Bison data center approved June 13, 2023 · City building permit for one data center at 5707 Loving Trail, Clayco, Inc., payment recorded February 8, 2024