Milestone December 1, 2025 IREN Childress “Horizon” Conversion

Horizon 1 energized, 50 MW IT (75 MW gross), IREN's first purpose-built AI hall

Horizon 1 came up in Q4 2025, direct-to-chip liquid-cooled and sized at 50 MW of IT load against 75 MW gross. The split matters for this record, which currently carries only the 75 MW gross number: the 200 MW Microsoft commitment is critical IT load, so Horizon 1 to 4 gross is materially larger than 200 MW.

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