🌎 Micro-reactor funding goes macro #309

Happy Monday!

The smallest nuclear reactors are now raising the biggest rounds, as policy and demand are accelerating the hype cycle. We dive into the why and the how below.

In deals, $750m for long-duration iron-air batteries in West Virginia; $80m for compressed-air energy storage in Toronto; and $63m for EV micro-mobility in Bengaluru.

In other news, critical minerals investments, climate impacts affecting power generation around the world, and green hydrogen project milestones.

And don’t miss our annual NYCW 2026 tracker, the insider guide to the week's best climate tech events. The more people who submit, the better it gets, so add yours here!

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Microreactors split the difference

Earlier this month, microreactor startup Valar Atomics raised a $1bn Series B, and another, Antares, announced a fresh $470m Series C. With a new licensing pathway in the US, active government backing, and growing defense and data center demand, the micro-reactor business model is looking like the next big thing in nuclear at large.

What happened

Microreactors are the smallest type of nuclear reactors, as prefab, ultra-small, highly portable units generating up to 20MW of clean power. (Compare that to small modular reactors (SMRs), which typically produce 75-350MW, and conventional reactors, at 1GW). They’re arguably one of the oldest types of reactors, powering nuclear submarines and aircraft carriers for 70-odd years. But for civil use, a spate of microreactor companies has emerged in the past decade.

And amid a nuclear hype cycle, they’re having a big moment, with two massive venture rounds occurring within days earlier this month:

Valar Atomic’s $1bn equity raise, at a ~$6bn valuation, plus a $200m credit line. Of that, it had already raised $450m ($340m equity and $110m debt) in March at a $2bn valuation, so about $750m is new ($660m equity, $90m debt). Valar's backers include Anduril (autonomous defense systems) and Palantir CTO Shyam Sankar, with the round led by Sequoia.
Antares’s $470m raise on 27 July ($370m Series C plus $100m debt). It was co-led by Paradigm and Caffeinated Capital, with Point72 Ventures, Shine Capital, and Industrious Ventures participating.

Why it matters

This has brought H2 2026 to the biggest half-year on record for micro-reactor funding, just over a month in. So far, this half’s $1.23bn beats H2 2025's $1.16bn.

That makes micro-reactors nuclear's fastest-growing investment area, taking the lead from buzzy SMRs. Funding is lumpy, but on 2026 year-to-date, micro-reactor developers have already out-raised SMR developers, a first. SMR developer funding has cooled as capital shifts downstream to the supply chain (companies like Blue Energy, Alva, Standard Nuclear, and The Nuclear Company all raised in H1 2026).

Microreactors claim to have quicker timelines, better unit economics, and a larger addressable market than other nuclear. Conventional nuclear reactors are expensive and slow to build, and even SMR sites are bigger than you’d expect. Microreactors are small enough to build in a factory (benefiting from economies of production), then ship out in a container and install on a site (lower risk of delays).

Beyond that, only a few grids need gigawatt-scale power. So microreactors could meet more use cases in more markets. A main one is diesel replacement, for off-grid and behind-the-fence loads, in military, mining, oilfield, and remote communities. The US DoD already awarded BWXT up to ~$300m to build and test a 1.5MW transportable reactor, and the US Air Force issued a notice of intent for Oklo to build and operate a ~5MW unit at a base. In April 2026 it picked bidders and locations for further micro-reactors.

And of course there’s data centers: If compute disperses toward smaller (e.g. ~10MW) facilities on the edges of towns and cities, built up incrementally, micro-reactors' modularity and siting flexibility become a real advantage. That’s likely as compute focus shifts from training to inference. E.g. Radiant holds a binding Equinix preorder for 20 of its 1.2MW Kaleidos units.

Meanwhile, policy tailwinds are lifting the sector. The US Nuclear Regulatory Commission (NRC) proposed new rules for factory-fueled and shippable units, fleet licensing across multiple sites, remote and autonomous operation, a 6–12 month licensing path, and non-traditional siting for data centers and remote industry. And for a DOE challenge this summer, four companies - Antares, Valar, Deployable Energy, and Aalo - achieved criticality. Valar's Ward 250 was the first DOE-authorized reactor built and operated outside the national lab system.

Takeaways

Data center and defense demand unlocks big pools of money. There’s no end in sight for data center appetite, as our H1 2026 investment trends report found, so anything that touches it stands to benefit.
Criticality isn’t commercialization. Most microreactor companies are still in R&D, the build-test-learn step rather than commercial power. What’s significant is the US government's shift to actively help developers with hardware, restarting a nuclear innovation cycle the US hasn't had in decades.
And going public anyway could be next. The nuclear public-market wave is already reaching micro, and more should follow. Nano Nuclear IPO’ed in 2024, and other names like Terra Innovatum, Hadron Energy, Deep Fission, and now NuCube have gone or are going public via SPAC. The better-funded privates (Radiant, Aalo, Antares, Valar) are plausible next candidates once they have a demo milestone in hand.

Deals of the Week (8/10-8/16)

VC / Growth

🔋 Form Energy, a Weirton, WV-based long-duration storage, iron-air battery developer, raised $750m in Growth funding from T. Rowe Price, Blindspot Ventures, Breakthrough Energy Ventures, Capricorn Investment Group, Coatue, and other investors.

🔋 Hydrostor, a Toronto, Canada-based long-duration, compressed-air, energy storage developer, raised $80m in Growth funding from Baker Hughes, Hatch, and Realize Capital Partners.

🛵 Yulu, a Bengaluru, India-based shared EV micro-mobility platform, raised $63m in Series C funding from GEF Capital.

🌡 Ranchbot Monitoring Solutions, a Fort Worth, TX-based remote water monitoring platform for agriculture, raised $15m in Series B funding from Lewis & Clark Partners, Fulcrum Global Capital, Builders VC, Cultiv8 Funds Management, Lever VC, and Macdoch Ventures.

⚡ AGent Energy, a Houston, TX-based platform connecting commercial backup generation to the grid, raised $11m in Seed funding from MassMutual Ventures, Spero Ventures, CIV, Intrepid Investment Managment, and Zero Infinity Partners.

⚒️ Riven Systems, a New York, NY-based developer of AI for raw material processing, raised $7.9m in Pre-seed funding from Cerberus Ventures, Alumni Ventures, CLAI Ventures, Lightscape Partners, New System Ventures, and Scout Ventures.

🌱 Inaara NeoFoods, a Mumbai, India-based vertically integrated plant-based food developer, raised $2.2m in Seed funding from a group of angel investors.

Project Finance / Debt

⚡ European Energy, a Søborg, Denmark-based renewable energy project developer, raised $39m in PF Debt funding from Danske Bank.

🛵 Yulu, a Bengaluru, India-based shared EV micro-mobility platform provider, raised $30m in Debt funding from undisclosed investors.

⛏️ Global Advanced Metals, a Boyertown, PA-based supplier of tantalum and niobium, raised $25m in Debt funding from the U.S. Export-Import Bank.

🪨 5E Advanced Materials, a Hesperia, CA-based supplier of refined boron and lithium, raised $8m in PF Debt funding from the U.S. Export-Import Bank.

Exits

🤖 Aegeus Technologies, a Bangalore, India-based developer of solar panel cleaning robotics, announced an IPO raising $2m

📦 LEAP India, a Mumbai, India-based provider of sustainable supply chain solutions announced an IPO raising $50m at an implied valuation of $734m.

💧 Dynatec Systems, a Burlington, NJ-based membrane-based industrial wastewater treatment provider, was acquired by Astara Capital Partners.

🌱 Kinertic, an Amsterdam, Netherlands-based carbon intelligence platform for commodities, was acquired by Context Labs for an undisclosed amount.

🚗 Electric GT, a Huntington Beach, CA-based provider of electric vehicle retrofitting systems for classic cars, was acquired by Electrogenic for an undisclosed amount.

🧪 Genomatica, a San Diego, CA-based sustainable chemicals developer, was acquired by AGAIN for an undisclosed amount.

🌡️ ClimateAi, a San Francisco, CA-based AI platform for climate resilience, filed for Bankruptcy / Out of Business.

Funds

🌱 WovenEarth Ventures, a Palo Alto, CA-based climate tech fund of funds manager, closed $155m for WovenEarth Fund II to invest and co-invest alongside early-stage US cleantech funds spanning energy, industry, and resilience.

💡 Energy Capital Partners, a Summit, NJ-based energy transition infrastructure investment firm, completed a fundraise of $8.1bn for ECP VI to invest in power generation, renewables and storage, and sustainable infrastructure.

This is a sample of deals available for Currence clients. Can’t get enough deals?

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Reading List

⛏ The White House announced over $2bn in new critical minerals, magnets, and battery investment. [Link]

This investment could genuinely accelerate the buildout of these strategic industries. However, without the EV market, which these inputs were meant to serve, the demand now rests on grid storage, defense, and data center hardware.

🪼 Jellyfish swarms knocked out 3.2GW of French nuclear power, while low water on the Danube forced a full shutdown of Romania's only nuclear plant. [Link, Link]

Both outages trace back to climate change; warmer oceans cause jellyfish blooms which can get stuck in cooling intakes, and drought dropped the Danube’s water level below what the Paks nuclear plant needs.

🔌 DOE canceled three proposed National Interest Electric Transmission Corridors. [Link]

This reads as a political move on electricity affordability as elections near. The NIETCs were the federal backstop for lines states wouldn't approve on their own, and now pulling them leaves state coalitions like the Western Transmission Expansion Coalition as the last line of defense for keeping these lines alive.

⚡ In hydrogen news, NEOM finished construction, so world's largest green hydrogen and ammonia complex is now entering commissioning. Additionally, De Nora and Maffei Sarda Silicati completed the Dragonfly green hydrogen plant in Sardinia. [Link, Link]

NEOM is big, with 1.2Mt/yr coming online next year, with the Air Products and Yara offtake locked in for ammonia and fertilizer export to Europe.

💧 P2H2 delivered its first industrial AEM electrolyzer, now being installed and commissioned to test flexible operation. [Link]

The FOAK follow-through on the SINTEF selection we flagged in a past edition. Flexible operation is the specific capability that lets electrolyzers chase cheap renewable power rather than run baseload.

🏭 Thyssenkrupp is in advanced talks to adjust funding for its $3.5bn green steel plant. [Link]

Green steel's flagship European project is renegotiating terms mid-build due to its planned hydrogen power supply becoming unrealistic. The talks have been with the EU and Germany, the country funding two-thirds of the project.

🌋 Fervo Energy reported Q2 2026 results, its first quarter as a public company. It missed on loss per share: $0.38 actual versus $0.07 expected. Shares are down over 20% this week. [Link, Link]

⛽ Amazon disclosed ownership of GW Ranch, a giant Texas data center and gas power complex. Meanwhile, Tesla is planning a $10bn chip factory “Terafab” in Texas, Musk says the factory will run on gas. [Link, Link]

🌡 The US just had its hottest month in recorded history, surpassing the Dust Bowl record. France's environment minister estimates heatwaves will cost the country €10-15bn, and Rhine water levels fell to new lows, halting boats at the chokepoint. [Link, Link, Link]

💡 New Currence case studies out on how TDK Ventures and Sabanci Climate Ventures use the platform. [Link, Link]

Opportunities & Events

💡 Climatebase Fellowship: Participate in a 12-week climate career accelerator that helps people find their place in the climate economy, through a structured curriculum, a global community of peers, and direct access to the experts and leaders working on the front lines of climate. Join a community of thousands of climate professionals. Apply by August 24.

💡 LACI Pilots at BAT — Applications open through August 28 for climate tech companies to test and demonstrate technologies at Brooklyn Army Terminal. Sectors: clean energy, zero emissions transport, built environment, blue economy, water, food and ag, industry, nature-based solutions.

💡Carbon to Value Initiative (Year 6): Carbontech accelerator from NYU Tandon's Urban Future Lab, Greentown Labs, and Fraunhofer, connecting startups with corporate partners for pilots across the carbon value chain. The six-month program starts December with in-person events in Boston, New York, and Houston. Apply by August 28.

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