IREN’s Texas Horizon 4 Site Lacks Backup Generators and Cooling Equipment

Backup generators and cooling equipment remain absent at IREN’s Horizon 4 site in Texas, putting year-end delivery for Microsoft at risk.

IREN is building Horizon 4 under an agreement valued at about $9.7 billion. A separate data center project for Nebius in New Jersey, with planned capacity of about 140 megawatts, may be delayed until 2027.

Microsoft lowered its full-year guidance after AI-related capital spending last quarter came in about $5 billion below expectations. A Microsoft spokesperson said the company’s infrastructure strategy remains flexible.

IREN and DataOne declined to comment.