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Last Energy

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Small modular nuclear reactors with full lifecycle services

Austin, United StatesFounded 2020Energy
Valuation $500M–1B Last recorded · 2025
Headcount <100 Current team size
Total funding $100–500M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Last Energy and the history behind them.

About Last Energy

Last Energy is a pioneering company in the field of small nuclear power plants, providing comprehensive services for the entire lifecycle of mini water-cooled reactors. The company focuses on markets that are committed to clean technology and have public support for nuclear power. These markets span across Europe, Africa, Southeast Asia, and Latin America.

Last Energy's primary clients are countries and industries looking to expand their nuclear power capabilities to meet sustainability goals. The company’s small nuclear reactors can produce both heat and electricity, making them versatile for various industrial applications. This includes not only generating clean electricity but also providing clean air, clean water, combined heat and power, and even facilitating the production of green fuels and carbon-negative materials.

The business model of Last Energy revolves around leveraging existing, proven nuclear technology that is already in use in hundreds of power plants worldwide. By focusing on standardization and simplifying systems, the company aims to make nuclear power scalable and rapidly deployable. This approach helps in reducing costs and speeding up the deployment process, making nuclear power more accessible and practical for a wider range of applications.

Last Energy makes money by offering a full suite of services that cover the entire development cycle of nuclear power plants. This includes everything from initial planning and design to construction, operation, and maintenance. By providing end-to-end solutions, the company ensures a seamless and efficient process for its clients, which in turn drives revenue.

In summary, Last Energy is at the forefront of small nuclear power plant development, serving global markets focused on clean technology. The company’s innovative approach and comprehensive service offerings make it a key player in the push towards sustainable and clean energy solutions.

Source: Dealroom company data

At a glance

Status
Operational
Founded
2020
Headquarters
Austin, United States
Employees
68
Open positions
12
Dealroom signal
87.7/100
Industry
Energy
Sub-industry
Clean Energy
Sector
Energy, Sustainable Development Goals, Nuclear Fission, Climate Tech, NIF defense security and resilience, NIF Energy Security and Climate Change, DT and LS, science-based
Technology
Hardware, Deep Tech
Business model
Manufacturing
Client focus
b2b

Funding history

4 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES COther financing Dec 2025 $100M $400M The Haskell Company · Ultranative · Woori Technology Investment · Galaxy Fund Management ↗
SERIES BOther financing Aug 2024 $40M $160M Autodesk Foundation · Gigafund ↗
Showing the latest 2 of 4 recorded eventsBook a demo for the full funding history →

Growth signals

Last Energy website traffic

Latest recorded traffic for Last Energy is 8.2K monthly website visits, down 36.9% over the last three months. Last Energy's team grew 13.3% over the past year.

Latest monthly visits8.2K 3-month web change-36.9% 1-year team growth+13.3%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Similar companies

Closest operating peers by Dealroom taxonomy

Company identity and context are open; selected comparison metrics preview what is available on the platform.

Showing 8 of the closest matchesCompare every metric →

Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

9 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Series A2 investors entered at this stage

  • Gigafund
  • Autodesk Foundation

Series B and later7 investors entered at this stage

  • Astera Institute
  • The Haskell Company
  • Ultranative
  • Woori Technology Investment
  • Galaxy Fund Management
  • AE Ventures
  • JAM Fund
Team profiled 11 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 2 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
4 countries with
team presence
🇺🇸 United States83.3%
🇬🇧 United Kingdom12.5%
🇷🇴 Romania2.1%
🇨🇦 Canada2.1%
4 countries shown

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Last Energy on X, ranked by likes and reposts, corporate channels excluded.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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