Data center developer Iren has completed its first 50 MW liquid‑cooled building, Horizon 1, for Microsoft’s Childress campus, marking a milestone in the company’s AI cloud expansion.

Iren has handed over the inaugural 50 MW liquid‑cooled data hall, Horizon 1, to Microsoft at the company’s Childress, Texas, AI‑focused campus, signaling the next step in Microsoft’s push to scale its artificial‑intelligence services.

Project Overview

The Horizon 1 facility, part of Iren’s modular data center portfolio, uses a closed‑loop water‑cooling system that reduces energy consumption compared with traditional air‑cooled designs. The 50 MW capacity is intended to support Microsoft’s growing AI workloads, including large‑language model training and inference.

Located on a 150‑acre site adjacent to Microsoft’s existing Childress campus, the building was constructed in just under a year, meeting the timeline set by Microsoft’s AI expansion roadmap.

Technical Highlights

  • Liquid‑cooling architecture delivering up to 30% lower Power Usage Effectiveness (PUE) than conventional systems
  • Modular construction allowing rapid deployment and future scalability
  • Integrated renewable energy sourcing, with a portion of power supplied by on‑site solar arrays

The facility also incorporates advanced monitoring and automation tools that enable real‑time optimization of cooling and power delivery, crucial for the high‑density AI servers Microsoft plans to install.

Strategic Implications for Microsoft

By adding Horizon 1, Microsoft expands its AI‑focused infrastructure in the U.S. Southwest, a region chosen for its favorable climate, grid reliability, and proximity to major fiber routes. The added capacity helps the tech giant meet the rising demand for AI compute from enterprise customers and its own internal services.

The partnership underscores Microsoft’s broader strategy of collaborating with specialized data‑center developers to accelerate the rollout of purpose‑built AI facilities, reducing the time needed to bring new compute resources online.

“Iren’s modular, liquid‑cooled solution aligns perfectly with Microsoft’s need for fast, efficient AI capacity,” said a Microsoft spokesperson, adding that the project will serve as a template for future expansions.

The delivery of Horizon 1 marks the first phase of a multi‑stage plan that could eventually reach several hundred megawatts of AI‑optimized power at the Childress site.

Data Center Dynamics coverage of Iren’s AI capacity delivery to Microsoft