What Radiant does

Radiant Industries, Inc. (doing business as Radiant Nuclear) is a U.S.-based, privately held clean-energy startup founded in 2019/2020 and headquartered in El Segundo, California, that develops portable, factory-built nuclear microreactors branded Kaleidos. The flagship Kaleidos unit is a 1.2 MWe / 1.9 MWt high-temperature gas-cooled reactor using meltdown-proof TRISO ceramic-coated uranium fuel, a helium primary-loop coolant, an air-jacket passive natural-convection cooling system that requires no on-site water, and a supercritical CO2 closed-loop Brayton power-conversion cycle — all packaged in a shipping-container form factor designed for transport by truck, rail, sea, or aircraft and full power within ~48 hours of deployment. The Kaleidos Demonstration Unit (KDU) is scheduled for fueled testing at Idaho National Laboratory's DOME test bed in 2026, with commercial production targeted to scale to 50 reactors per year at the planned R-50 factory in Oak Ridge, Tennessee beginning construction in early 2026.

Radiant serves defense (U.S. Air Force, DIU, DOD), data center / digital infrastructure (Equinix pre-ordered 20 units with deposits), remote mining and industrial (Idaho Strategic Resources MOU), and remote-communities/disaster-relief customers seeking to displace diesel generation with zero-emissions, high-energy-density baseload power. Go-to-market is direct enterprise and government field sales paired with regulatory program participation (DOE Reactor Pilot, ANPI, HALEU allocation, NRC Part 70) and a strategic investor ecosystem anchored by Lockheed Martin Ventures, Centrus Energy (HALEU supply), and tier-1 VCs including Andreessen Horowitz, DCVC, Draper Associates, Boost VC, and Founders Fund.

Radiant's revenue model is pre-commercial: customers can acquire units through direct hardware sales or long-term Power Purchase Agreements (PPAs), with factory refueling every 5+ years supporting a recurring services revenue layer over a 20-year product lifetime. To date, revenue is limited to non-dilutive government awards (DOE FEEED, DOE OECIF, DOD SBIR Phase II, DOE GAIN voucher) and customer deposits. The company has raised over $465 million cumulatively at a $1.8 billion valuation (December 2025) and employs 101-250 people across El Segundo, Oak Ridge, and an INL-affiliated test presence.

Name

Radiant

Legal name

Radiant Industries, Inc.

Website

https://radiantnuclear.com

Company type

Private

Founded year

2020

Operating status

Operating

Headcount range

101–250 employees

Short description

Radiant Industries (Radiant Nuclear) is an El Segundo-based startup developing the Kaleidos portable nuclear microreactor — a 1.2 MWe factory-built HTGR in a shipping container — to replace diesel generators for defense, data center, remote mining, and disaster-relief customers. Pre-commercial; raising capital to build the R-50 Oak Ridge factory.

Ownership category

akta.pro rank

Product category

Advanced Nuclear Microreactors

NAICS

Nuclear Electric Power Generation (221113)

akta.pro primary industry

Gen IV / Advanced Reactor Systems (SFR, LFR, GFR, MSR, HTGR, Microreactors) (EUAKADAC)

akta.pro secondary industry

Microreactor Power Generation (EUACADAG)

Keywords

• Portable nuclear microreactor
• Factory-built nuclear reactors
• Advanced nuclear energy
• Mass-produced nuclear power
• Clean energy microreactors

Headquarters

HQ city

El Segundo

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Technology or R&D

Revenue model

1. Direct unit sales of Kaleidos microreactors: Pre-revenue/commercial-stage. Hardware sales of factory-assembled, fueled, and tested Kaleidos units (1.2 MWe / 1.9 MWt). 20-unit pre-order with deposits from Equinix and production commitments of more than 10 reactors through 2030.
2. Power Purchase Agreements (PPAs): Customers can purchase power through long-term Power Purchase Agreements rather than owning units outright, enabling a recurring revenue / managed-energy-services model post-commercialization.
3. Refueling and lifecycle services: Refueling performed back at the Radiant factory approximately every 5 years (up to 4 refuels per reactor over a 20-year product lifetime), creating recurring service revenue tied to deployed fleet.
4. Government awards and DOE/NRC program funding: Non-dilutive awards including $3.9M DOE FEEED program, $3.8M DOD OECIF award, DOE GAIN voucher with Argonne National Lab, DOD SBIR Phase II, DOE HALEU allocation, and DOE Reactor Pilot Program participation.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels7 records

Core offering

Radiant designs and manufactures the Kaleidos portable nuclear microreactor — a factory-built, mass-producible 1 MWe (1.9 MWt) high-temperature gas-cooled reactor using TRISO ceramic-coated uranium fuel, helium primary-loop coolant, supercritical CO2 Brayton power conversion, and passive air-jacket cooling. Packaged in a shipping-container form factor, Kaleidos is designed to replace diesel generators for military bases, data centers, remote communities, hospitals, and industrial sites.

Product overview

Radiant Industries is a single-product company built around the Kaleidos portable nuclear microreactor, which serves as both the core product and the platform on which all other offerings are anchored. The flagship Kaleidos unit is a 1 MWe high-temperature gas-cooled microreactor using TRISO fuel and helium coolant, factory-built in a shipping-container form factor for mass production. The Kaleidos Demonstration Unit (KDU) is the pre-production prototype currently being fueled and tested at Idaho National Laboratory's DOME facility, serving as the bridge to commercial deployment. Production is planned to scale via the R-50 Production Facility in Oak Ridge, Tennessee, which will manufacture up to 50 units per year. Supporting the hardware are Radiant's internal Digital Twin simulation platform and its centralized 24/7 Fleet Monitoring System, which together enable autonomous operation, predictive maintenance, and continuous fleet-level intelligence across deployed units. Customers can obtain Kaleidos reactors either through Power Purchase Agreements (PPAs) or direct unit sales, with a 20-year product lifetime supported by factory refueling.

Differentiator

Problem solved

Functional benefit

Brands

• Kaleidos: A portable nuclear microreactor that replaces diesel generators. The world's first mass-produced portable nuclear microreactor delivering 1MW of electricity, packaged in a shipping container for transport by land, sea, or air.
• Kaleidos Demonstration Unit (KDU)

Products and services

• Kaleidos Microreactor A portable, factory-built, mass-producible 1 MWe high-temperature gas-cooled nuclear microreactor packaged in a single shipping container. Uses helium gas coolant, meltdown-proof TRISO fuel, passive air cooling (no on-site water), and operates for 5+ years without refueling. Replaces diesel generators for military installations, data centers, remote villages, and hospitals.
• Kaleidos Demonstration Unit (KDU) Pre-production prototype of the Kaleidos microreactor scheduled for full-power fueled testing at Idaho National Laboratory's DOME facility; the same reactor design intended for commercial sale.
• R-50 Production Facility The world's first commercial factory for mass-produced portable nuclear microreactors, located on the historic K-27 and K-29 Manhattan Project sites in Oak Ridge, Tennessee. Under NRC 10 CFR Part 70 license review with planned production scaling to 50 Kaleidos reactors per year for commercial release in 2028.
• Centralized 24/7 Fleet Monitoring System Continuous data-streaming, centralized fleet monitoring service from which Radiant tracks the health of each deployed Kaleidos reactor, supporting autonomous operation and fleet-level intelligence across hundreds of units.
• Digital Twin Simulation Platform In-house digital twin and simulation software used to predict Kaleidos reactor system performance, integrated with hardware test data to validate models against physical measurements; supports design optimization and regulatory validation.
• Kaleidos Power Purchase Agreement (PPA) and Direct Unit Sales Two customer procurement models: long-term Power Purchase Agreements (PPAs) or direct unit sales of the Kaleidos microreactor. The fuel is depleted after 5+ years and the entire container is shipped back to the factory for refueling (up to 4 refuels over a 20-year product lifetime).

Quantifiable outcome

• 110x the energy density of diesel systems
• +4 more outcomes

Named customers5 records

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability2 records

Feature6 records

Scale indicators13 records

Recent moves7 records

Expansion highlights7 records

Direct peers

• Oklo: Oklo designs compact fast reactors and is pursuing a similar behind-the-meter, off-grid power thesis for data centers and remote sites; it is at a comparable stage of advanced reactor development with overlapping target customers (hyperscalers, defense, remote industry).
• Ultra Safe Nuclear Corporation (USNC): USNC develops Micro Modular Reactor (MMR) high-temperature gas-cooled units with TRISO fuel — the same fuel form factor as Kaleidos — and targets distributed power for remote communities, mining, and industrial sites, making it one of the closest technology and use-case analogs to Radiant.
• Last Energy: Last Energy is developing small, modular, factory-built pressurized water reactors primarily targeted at European industrial and data center customers; its "power plant in a box" philosophy, factory manufacturing, and customer focus on commercial/industrial buyers directly mirror Radiant's portable microreactor model.

Emerging players

• X-energy: X-energy is developing the Xe-100 high-temperature gas-cooled reactor and TRISO-based fuel (XEPRIME) for both industrial process heat and data center power; it shares Radiant's HTGR/TRISO technical base but is targeting larger multi-module plants rather than a portable shipping-container unit.
• Kairos Power: Kairos Power is building fluoride salt-cooled high-temperature reactors (Hermes test reactor, KP-FHR) with NRC engagement for non-portable but distributed advanced nuclear; it competes for similar DOE program slots, HALEU-class fuels, and behind-the-grid customer demand.
• Terrestrial Energy: Terrestrial Energy is developing the Integral Molten Salt Reactor (IMSR) for industrial and data-center customers with NRC and Canadian Nuclear Safety Commission engagement; it targets a similar distributed industrial power thesis as Radiant but with a different reactor coolant and fuel form.

Broad incumbents

• NuScale Power: NuScale is the most advanced publicly listed SMR developer, with NRC design certification for its VOYGR module; it competes with Radiant for data center and industrial decarbonization RFPs but at a much larger per-module scale and slower factory deployment cadence.
• Westinghouse Electric Company: Westinghouse is the established incumbent in commercial nuclear with the AP300 small modular reactor program (where Radiant's CNO Rita Baranwal previously led); it competes head-on with Radiant for data center and industrial SMR customers and brings deep regulatory and utility relationships.
• TerraPower: TerraPower, founded by Bill Gates, is developing the Natrium sodium-cooled fast reactor with HALEU fuel and a dedicated HALEU enrichment project; it overlaps with Radiant on DOE program participation, HALEU supply competition, and data center/defense customer pipelines but at grid-scale rather than portable scale.
• Rolls-Royce SMR: Rolls-Royce SMR is developing a 470 MWe small modular reactor with UK regulatory approval progress and emerging US data center interest; it competes for the same hyperscaler and industrial decarbonization RFPs as Radiant but at a fundamentally larger per-unit scale and slower manufacturing cadence.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xx.com/RadiantNuclear
• LinkedInlinkedin.com/company/r-a-d-i-a-n-t

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles11 records

Subsidiaries1 record

Funding overview

Funding rounds7 records

Investors40 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Radiant