Holtec International

HI-STORM

Operational

Industry-leading dry cask storage system for spent nuclear fuel - the most widely deployed system of its kind worldwide.

Latest update Jul 10, 2026

HI-STORM

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Current status

In commercial operation across Holtec's global dry storage business, which served 155 reactors worldwide by the end of 2025 and continues to expand with new projects in Asia and Europe.

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Specifications5

Reactors Served

More than 150 commercial nuclear reactors worldwide as of June 30, 2026 (Sept 8, 2026 S-1/A); earlier company materials cited 155

System Type
MPC-based dry storage and transport platform
U.S. Output Share
~75% of U.S

reactors (70 of 94, as of Jun. 30, 2026 per the August 2026 S-1/A); Holtec also holds 90%+ share of the separate U.S. wet-storage market

Domestic Market Share
~75%
Global Deployment
U.S. and international nuclear plant sites

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