Startup profile for Radiant Nuclear: latest funding, latest known valuation, total disclosed funding, investors, status, sources, and why the company is interesting. Part of the Venture Capital Tracker startup directory.
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Radiant Nuclear funding, valuation and investors

Portable microreactor company building Kaleidos for remote and defense energy.

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Funding, valuation & investors

Answer-first snapshot

Latest funding

Series C

$100M · October 2024

Latest known valuation

Not publicly disclosed

Total disclosed equity funding

$140M

Excludes debt, grants, acquisitions, secondaries, and IPO proceeds.

Current status

private

growth · El Segundo, California, USA

Investors in latest funding

Other: Andreessen Horowitz , Union Square Ventures

Sources: latest funding Last verified: 2026-07-25

Overview

Radiant Nuclear develops Kaleidos, a portable microreactor designed to deliver 1MW+ electric power for remote military bases, disaster response, and off-grid industrial sites. Founded by engineers from SpaceX and McMaster-Carr alumni networks, Radiant uses TRISO fuel in a compact design transportable by truck. a16z led $40M Series B (Apr 2023); DCVC led $100M Series C (Oct 2024) with Founders Fund, USV, and Cantos participating.

Why Radiant Nuclear is interesting

a16z led $40M Series B (2023) for truck-transportable reactors — American Dynamism meets climate; Series C ($100M, 2024) from DCVC funds demo unit path.

Product & use cases

Kaleidos microreactor aims for factory fabrication, truck transport, and plug-and-play deployment — replacing diesel generators at remote sites with nuclear power.

  • Defense forward operating base power
  • Remote mining and industrial sites
  • Disaster relief energy independent of fuel supply chains
  • Arctic and island grid supplementation

Key facts

  • Series C (Oct 2024): $100M led by DCVC
  • Series B (Apr 2023): $40M led by a16z
  • Kaleidos portable microreactor in development
  • Founders from SpaceX engineering background

Funding history (newest first)

Series C

2024-10 $100M

Source: https://www.radiantnuclear.com/blog/series-c

Series B

2023-04 $40M

Source: https://www.radiantnuclear.com/blog/series-b

Investors in our directory

Funds linked from Radiant Nuclear's profile — open a fund page for stage focus and related deal articles.

Andreessen Horowitz Cantos Founders Fund Union Square Ventures

Competitive landscape

Edge: SpaceX-style hardware iteration culture applied to nuclear; portable form factor vs large conventional SMR projects.

Advanced nuclear faces regulatory and fuel supply hurdles measured in years. Radiant bets portable microreactors win defense and remote commercial niches before grid-scale SMRs deploy.

  • Oklo direct

    Microreactor developer targeting similar remote power markets.

  • NuScale adjacent

    Traditional SMR path — larger units, longer NRC timelines.

  • Diesel generators incumbent

    Default remote power today — Radiant must beat on logistics and lifecycle cost.

Notable stories

  • Radiant published progress on building demonstration reactors at faster cadence than traditional nuclear — explicit SpaceX manufacturing inspiration.

Industries

Climate Tech Deep Tech Defense Tech Space Tech

FAQs about Radiant Nuclear

Practical answers founders, operators, and investors typically search for.

Radiant develops Kaleidos, a portable microreactor for remote and defense power replacing diesel generators.
a16z (/fund/andreessen-horowitz) led Series B. Founders Fund (/fund/founders-fund), USV (/fund/union-square-ventures), Cantos (/fund/cantos) participated.
Radiant's truck-transportable microreactor design using TRISO fuel.
October 2024 — $100M led by DCVC per company blog.
Both pursue microreactors; compare designs, regulatory path, and target customers.
Advanced reactor developers must navigate NRC licensing — timelines are multi-year; check company updates.
Doug Bernauer (CEO) and team with aerospace hardware backgrounds.
$40M Series B + $100M Series C documented; earlier seed rounds additional.
El Segundo, California.
Radiant is developing demonstration units; commercial deployment timelines not yet public as of sources reviewed.
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By Venture Capital Tracker

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Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.