# Radiant Industries Startup profile on Capital Atlas: https://capitalatlas.ai/startups/radiant-industries - Industry: Renewable Energy - Headquarters: El Segundo, US - Website: www.radiantnuclear.com - Total disclosed funding: $488M - Latest round: Series D (Dec 15, 2025) - Investors on record: 29 ## About Radiant Industries, Inc. is a US-based company specializing in innovative portable nuclear microreactors, designed to efficiently replace traditional diesel generators across various applications, promoting cleaner energy solutions for military and commercial sectors. Founded in 2020 and headquartered in El Segundo, US, Radiant Industries, Inc. focuses on developing portable nuclear microreactors. In December 2025, Radiant Industries, Inc. raised more than USD 268.80 million in?series D funding?co-led by Draper and Boost VC, with participation from Founders Fund, Andreessen Horowitz, ARK Invest, Union Square Ventures, Align Ventures, StepStone, Giant Ventures, Washington Harbour Partners, DCVC, Chevron Technology Ventures. In-Q-Tel, Lockheed Martin Ventures, Friends & Family Capital, and other unspecified investors also participated in the round. CEO Doug Bernauer leads the company’s vision and strategy as it continues to grow in the energy sector. Radiant Nuclear's core product offering is the Kaleidos portable nuclear microreactor, designed to replace diesel generators in diverse applications such as remote villages, hospitals, datacenters, and military installations. This compact reactor generates electricity in a mass-producible format, highlighting its efficiency and mobility. The Kaleidos system operates efficiently at power levels ranging from 30% to 100% of its capacity, providing 1 MW of electrical output while also delivering 1.9 MW of thermal power suitable for facility heating and water desalination. These reactors utilize passive air cooling with no on-site water requirements, allowing for operational flexibility in various geographical markets, including remote areas that lack reliable power infrastructure. With a focus on reducing reliance on fossil fuels, Radiant Nuclear serves both military and commercial clients, facilitating a transition to clean energy sources without the complications of traditional nuclear power facilities. Radiant Nuclear's revenue model is primarily based on direct sales and Power Purchase Agreements (PPAs) associated with the Kaleidos microreactor. Clients engage with the company through structured transactions, acquiring units that are factory-assembled, fueled, and tested prior to deployment. Each reactor can be operational within a day of delivery, enhancing the efficiency of the supply chain and reducing downtime for customers. The company's client base includes military organizations and commercial entities looking for reliable alternative energy solutions, positioning Kaleidos as a flagship product that addresses high energy demands while minimizing environmental impact. Revenue generation will be supported by ongoing service agreements for maintenance and refueling, as the reactors can be refueled multiple times throughout their 20-year lifespan. ## Funding rounds - Series D, Dec 15, 2025, $269M — Union Square Ventures, Founders Fund, Chevron Technology Ventures, StepStone, Andreessen Horowitz, In-Q-Tel, DCVC, Boost VC, Draper, Lockheed Martin Ventures, Align Ventures, Giant Ventures, Ark Invest, Washington Harbour Partners, Friends & Family Capital - Series C, Feb 13, 2025, $66M — StepStone, Align Ventures, Hanwha Asset Management, Giant Ventures, Hartbeat Ventures, Ark Invest, Crossbeam Venture Partners, SGA, Gigascale Capital, Dcvc - Series C, Oct 23, 2024, $100M — Union Square Ventures, Founders Fund, Chevron Technology Ventures, Andreessen Horowitz, Felicis Ventures, DCVC, Boost VC, Also Capital, Decisive Point, Washington Harbour Partners, McKinley Management - Series B, Apr 4, 2023, $41M — Founders Fund, Andreessen Horowitz, Boost VC, Draper, Cantos Ventures, Decisive Point, McKinley Management - Series A, Feb 18, 2022, $13M — Union Square Ventures, Boost VC, Energy Impact Partners, Cantos Ventures, Tribe Capital, Also Capital, Decisive Point, Jam Fund, McKinley Management, Nucleation Capital ## Investors - Union Square Ventures (https://capitalatlas.ai/funds/union-square-ventures) — Series A, Series C, Series D - Boost VC (https://capitalatlas.ai/funds/boost-vc) — Series A, Series B, Series C, Series D - Energy Impact Partners (https://capitalatlas.ai/funds/energy-impact-partners) — Series A - Cantos Ventures (https://capitalatlas.ai/funds/cantos-ventures) — Series A, Series B - Tribe Capital (https://capitalatlas.ai/funds/tribe-capital) — Series A - Also Capital (https://capitalatlas.ai/funds/also-capital) — Series A, Series C - Decisive Point (https://capitalatlas.ai/funds/decisive-point) — Series A, Series B, Series C - Jam Fund (https://capitalatlas.ai/funds/jam-fund) — Series A - McKinley Management (https://capitalatlas.ai/funds/mckinley-management) — Series A, Series B, Series C - Nucleation Capital (https://capitalatlas.ai/funds/nucleation-capital) — Series A - Founders Fund (https://capitalatlas.ai/funds/founders-fund) — Series B, Series C, Series D - Andreessen Horowitz (https://capitalatlas.ai/funds/andreessen-horowitz) — Series B, Series C, Series D - Draper (https://capitalatlas.ai/funds/draper) — Series B, Series D - Chevron Technology Ventures (https://capitalatlas.ai/funds/chevron-technology-ventures) — Series C, Series D - Felicis Ventures (https://capitalatlas.ai/funds/felicis-ventures) — Series C - DCVC (https://capitalatlas.ai/funds/dcvc) — Series C, Series D - Washington Harbour Partners (https://capitalatlas.ai/funds/washington-harbour-partners) — Series C, Series D - StepStone (https://capitalatlas.ai/funds/stepstone) — Series C, Series D - Align Ventures (https://capitalatlas.ai/funds/align-ventures) — Series C, Series D - Hanwha Asset Management (https://capitalatlas.ai/funds/hanwha-asset-management) — Series C - Giant Ventures (https://capitalatlas.ai/funds/giant-ventures) — Series C, Series D - Hartbeat Ventures (https://capitalatlas.ai/funds/hartbeat-ventures) — Series C - Ark Invest (https://capitalatlas.ai/funds/ark-invest) — Series C, Series D - Crossbeam Venture Partners (https://capitalatlas.ai/funds/crossbeam-venture-partners) — Series C - SGA — Series C - Gigascale Capital (https://capitalatlas.ai/funds/gigascale-capital) — Series C - In-Q-Tel (https://capitalatlas.ai/funds/in-q-tel) — Series D - Lockheed Martin Ventures (https://capitalatlas.ai/funds/lockheed-martin-ventures) — Series D - Friends & Family Capital (https://capitalatlas.ai/funds/friends-family-capital) — Series D