The Nuclear Regulatory Commission finalized Amendment No. 10 to Holtec International's HI-STORM Flood/Wind dry storage system, Certificate of Compliance No. 1032. The changes allow higher per-canister heat loads, site-specific loading flexibility, and reduced minimum cooling times — effectively increasing the throughput capacity of existing spent fuel storage installations at nuclear plants.
NRC Approves Holtec's Upgraded Spent Fuel Storage System — A Quiet Win for Nuclear's Capacity Expansion
Amendment No. 10 to Holtec's HI-STORM license raises heat load limits and cuts cooling times, directly enabling more nuclear fuel to be stored at existing sites.

| Ticker | Company | 1-year change |
|---|---|---|
| CEG | Constellation Energy | −35.8% |
| VST | Vistra | −22.2% |
| SMR | NuScale Power | −74.1% |
| OKLO | Oklo | −64.4% |
Higher heat load limits mean more fuel stored per site, which means nuclear plants can keep running longer — Constellation is the direct operator beneficiary.
Who cashes in: Holtec International is private, so there's no direct ticker. But the amendment benefits every nuclear operator that uses HI-STORM systems, which includes Constellation Energy CEG, the largest U.S. nuclear fleet operator, and Vistra VST, which has been expanding its nuclear footprint. Higher storage capacity per site reduces the operational bottleneck that limits how long plants can run before needing offsite storage solutions. NuScale Power SMR and Oklo OKLO are small modular reactor developers that benefit from any regulatory action that normalizes nuclear infrastructure approvals — the NRC moving efficiently on storage amendments signals a more permissive posture broadly.
Who's exposed: There's no direct loser here. The risk is that expanded dry storage capacity reduces urgency around a permanent federal repository, which has been a political football for decades — companies lobbying for Yucca Mountain-style solutions may find their argument weakened if interim storage becomes more efficient.
What to watch next: Whether Constellation or Vistra cite the amended storage capacity in upcoming earnings guidance as a factor in plant life extension decisions. Extended plant life is the real money — storage flexibility is the enabler.
Source: original report ↗
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