Prometheus Hyperscale has revealed plans for a second AI data center campus in Wyoming, which it says could eventually deliver 1.5GW of IT capacity.

The company is working to develop the campus near the city of Casper, the second largest settlement in the Cowboy State. It will be powered by natural gas, a polluting fossil fuel, but Prometheus says the campus will be carbon negative thanks to the deployment of carbon capture technologies from two firms, Spiritus and Casper Carbon Capture.

It is expected that $500 million will be invested to kick-start the project. The first IT-ready power is expected to arrive on the site in 2026.

Trenton Thornock, founder and CEO of Prometheus Hyperscale, said: “We’re excited to develop another project in Wyoming. The Casper project and this partnership with Spiritus and Casper Carbon Capture further enables Prometheus’ vision of developing the future of digital infrastructure sustainably.”

Founded as Wyoming Hyperscale Whitebox before rebranding in 2024, Prometheus is building its flagship campus on land owned by Thornock’s family in Evanston, Wyoming. Designed to cater to hyperscalers running AI workloads, the firm says it will deploy a number of low-carbon technologies to help power the facility, including small nuclear reactors and organic flow batteries. However, it will also be reliant on natural gas.

For the Casper site, it plans to design and finance “high-density compute halls using proprietary aquifer, non-consumptive water-cooling systems to maximize energy efficiency.” The natural gas power will be provided by Spiritus brand Orchard Power, which promises to deliver affordable, net-zero, electricity by using direct air capture technology to capture all harmful emissions associated with energy generation.

Spiritus runs Orchard One in Wyoming, which it hopes will become the world’s largest carbon capture project. Working with another firm, Casper Carbon Capture, it intends to send carbon emissions from the Prometheus data center to sequestration wells in Natrona and Converse Counties in the state, ensuring permanent storage of captured emissions.

Charles Cadieu, CEO and co-founder of Spiritus, said: “AI companies can’t wait years for power. By partnering with Prometheus, we’re delivering firm capacity to meet the urgency the market demands. Orchard Power gives tenants reliable, affordable, carbon-negative electricity at hyperscale, when and where it’s needed.”

Casper Carbon Capture CEO and co-founder, Jess Foshee, added: “By bringing world-class partners together, we’re showing that Wyoming’s land, resources, and people can power the future while we keep our commitment to stewardship and community at the center.”

Away from Wyoming, Prometheus has partnered with Engie North America to colocate data centers with renewable and battery storage facilities in and around Dallas, Texas.