KP-FHR
The KP-FHR commercial reactor
Kairos Power's commercial reactor is informed by thousands of hours of operational data. The compact unit is designed for modular deployment with a two-over-one plant configuration that balances complexity, efficiency, and cost.
Key features
Inherently safe
Simplified design
Low pressure
Molten salt coolant
High temperature
Industrial heat applications
Licensable
NRC permitted
Advanced fuel
Robust safety
Electricity generation
Clean, firm base load
Modular design
Efficient construction
High power density
Large output, small size
Small footprint
Increased siting flexibility
Scalable
Multi-unit deployment
Online refueling
Reduced downtime
Made in the U.S.
In-house manufacturing
Clean firm scalable power
Kairos Power's commercial plant is an efficient, reliable generation source that complements renewables, delivers affordable electricity for a range of applications, and supports future growth in a diverse energy portfolio.
MULTI-UNIT CONFIGURATIONS
Modular commercial power plant
Minimum configuration. Two reactors with a shared power conversion system generating up to 150 MWe for grid operations, data centers, or industrial users. Add more reactor pairs to increase capacity as energy needs evolve.
Standard configuration. An advanced nuclear workhorse with six reactors generating a combined 450 MWe of reliable, carbon-free electricity to support base load generation and large-scale infrastructure.
Larger configurations. Combine four, five, or six reactor pairs for a plant generating 600-900 MWe or more. The KP-FHR commercial plant allows flexibility to scale with rising demand.
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Our advanced reactor technology
Robust inherent safety, high efficiency, low-pressure operation, and online refueling—all in a compact, modular design.
Why KP-FHR
An advanced reactor technology that prioritizes safety, cost-effectiveness, and long-term sustainability from development to demonstration.
High-temperature tolerant TRISO fuel and chemically stable Flibe coolant work together to create an inherently safe design. The reactor’s intrinsic low pressure, along with TRISO's proven ability to retain fission products, enhances safety and eliminates the need for high-pressure containment structures.
Our approach is driven by strategic technology selection, enabling the use of conventional fabrication methods, off-the-shelf components, and in-house production to target costs competitive with natural gas. KP-FHR's passively safe design and optimized safety footprint reduce reliance on high-cost, nuclear-grade structures.
Leading the way in advanced reactor licensing
Our long-running engagement with the U.S. Nuclear Regulatory Commission (NRC) and demonstrated progress in siting and permitting advanced reactor projects are helping us de-risk licensing for the commercial KP-FHR fleet.
- 3 approved NRC construction permits
- 14 approved topical reports supporting KP-FHR licensing
- Nuclear safety-related construction underway
DEC 2023
Hermes
The first Gen IV reactor to receive an NRC construction permit. Nuclear safety-related construction commenced in May 2025.
Nov 2024
Hermes 2
Our commercial-scale demonstration plant. The first electricity-producing Gen IV reactor to receive an NRC construction permit.
Partnerships on the path to commercialization
We've brought together key partners to support KP-FHR commercialization, forming a strategic alliance with industry leaders and giving them a front row seat to our iterative development process.
Kairos Power assembled a first-of-its-kind advanced nuclear alliance with North America’s leading nuclear utilities and generating companies to support KP-FHR technology development, licensing, manufacturing, construction, and commercialization.
Kairos Power and Google signed the world's first corporate agreement for multiple advanced reactor deployments, committing to develop a fleet of U.S. nuclear power projects delivering up to 500 MW of clean electricity by 2035.
BUILT AND TESTED BY KAIROS POWER
Technology backed by demonstrated hardware
Discover how our delivery model enables scalable commercial deployment.
By integrating a rapid iterative development approach with in-house manufacturing and pre-fabrication, we solve challenges early, gain a deep understanding of cost, and unlock more efficient, affordable construction.
