Holtec International
SMR-300 pressurised water reactor
Ranked #7 in Best Small Modular Reactor Companies.
Holtec International designs the SMR-300, a pressurised water SMR of about 340 megawatts. It filed the first part of a construction permit application for two SMR-300 units next to the Palisades plant in Covert, Michigan in December 2025, and the NRC accepted it for review in February 2026.
At a glance
| Price from | Custom |
| Best for | Utilities adding SMRs at existing nuclear sites |
From Holtec International's own website.
What stands out
- Site next to an existing nuclear plant
- Large nuclear services business behind it
Worth knowing
- Construction permit not yet granted
- Second part of application still to file
How it ranks
Holtec International is ranked 7th of 10 in Best Small Modular Reactor Companies (Lister Score 89.7).
#7 in Best Small Modular Reactor Companies · Lister Score 89.7
The NRC accepted Holtec's partial construction permit application for the Palisades SMR-300 units in February 2026..
| Rank | Best Small Modular Reactor Companies | Score |
|---|---|---|
| 1 | GE Vernova Hitachi Nuclear Energy | 97.2 |
| 2 | NuScale Power | 95.9 |
| 3 | TerraPower | 94.8 |
| 4 | Rolls-Royce SMR | 93.6 |
| 5 | Kairos Power | 92.3 |
| 6 | X-energy | 91.0 |
| 7 | Holtec International | 89.7 |
| 8 | Oklo | 88.3 |
| 9 | Westinghouse | 86.9 |
| 10 | Aalo Atomics | 85.4 |
Frequently asked questions
How does Holtec International rank on Lister?
Holtec International is ranked 7th of 10 in Best Small Modular Reactor Companies (Lister Score 89.7).
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