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Microreactor startups draw record capital as AI power demand climbs

Microreactor startups draw record capital as AI power demand climbs

Money Moves

Last Energy's $40 million round is one piece of a nuclear-financing wave that roughly doubled in 2026

Today: Last Energy discloses $40M Series B

Overview

Data centers running artificial-intelligence models need power around the clock. On July 10, 2026, a Washington, D.C. startup called Last Energy said it had raised $40 million to sell them small nuclear reactors it promises to build in 24 months.

The round, led by venture firm Gigafund, is a small piece of a much larger shift. Nuclear financing hit about $14 billion in 2026, roughly double the year before. The money signals that investors now bet on shipping reactors, not just designing them.

Why it matters

The reactors powering tomorrow's AI could be factory-built boxes the size of shipping containers, sited next to the data centers they feed.

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Key Indicators

$40M
Series B raise
Last Energy's new round, led by Gigafund.
$64M
Total raised since 2019
Cumulative funding for the seven-year-old startup.
20 MW
Reactor output
One PWR-20 unit, versus about 1,100 MW for a full-size reactor.
80 units
Commercial agreements
Signed orders, with 39 earmarked for data-center customers.
$14B
2026 nuclear financing
Roughly double the prior year's total across the sector.

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People Involved

Organizations Involved

Timeline

January 2019 July 2026

5 events Latest: Today
Tap a bar to jump to that date
  1. Last Energy discloses $40M Series B

    Today Funding

    The startup reveals a $40 million round led by Gigafund, bringing total funding to about $64 million.

  2. Rival raises stakes

    Business

    Competitors including Valar Atomics push factory-built reactor designs, part of the sector's 2026 funding jump.

  3. Federal nuclear loans expand

    Policy

    The U.S. Department of Energy moves to lend up to $17.5 billion to speed deployment of large reactors amid AI power demand.

  4. Texas microreactor plan announced

    Business

    Last Energy reveals plans for 30 microreactors on a 200-acre Haskell County site to serve Texas data centers.

  5. Last Energy founded

    Origin

    Bret Kugelmass spins the company out of his research group to commercialize standardized microreactors.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

2009–2024

Vogtle Units 3 and 4 (2009–2024)

Georgia Power began building two large reactors at Plant Vogtle, each about 1,100 megawatts. The project ran roughly seven years late and cost more than $30 billion, over double the original estimate.

Then

The reactors finally reached full power in 2023 and 2024, the first new U.S. units built from scratch in decades.

Now

The overruns scared utilities off large custom reactors and pushed the industry toward smaller, standardized designs.

Why this matters now

Vogtle is the cautionary tale Last Energy sells against: build small and identical in a factory instead of huge and bespoke on-site.

November 2023

NuScale UAMPS project cancellation (2023)

NuScale Power, the first small modular reactor design approved by U.S. regulators, canceled its flagship Idaho project. Rising costs pushed the projected power price too high, and subscribers pulled out.

Then

NuScale's stock fell sharply and the small-reactor field lost its most advanced U.S. project.

Now

It showed that regulatory approval alone does not guarantee a buildable, affordable plant.

Why this matters now

It marks the risk in Last Energy's path: signed agreements and clever designs can still collapse on cost before a reactor runs.

Sources

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