Startup · United States
Last Energy
HQ Washington, United StatesFounded 201951-200 employees
Last Energy is a new nuclear energy solution for customers of any size – rapidly deploying, affordable, clean, baseload power at scale with a full-service delivery model.
Products1
Newest unveiled first. Open a product for its milestone timeline, components and sources.
Funding4 rounds · $163M
- Disclosed
- $163M
- Latest
- $100MSeries C · Dec 16, 2025
| Announced | Stage | Valuation | Basis |
|---|---|---|---|
| Feb 25, 2020 | Seed | $15.0M | Post-money |
| Feb 16, 2021 | Series A | $88.1M | Post-money |
| Aug 29, 2024 | Series B | $381M | Post-money |
| Dec 16, 2025 | Series C | $617M | Post-money |
| Announced | Stage | Amount | Valuation | Lead investors | Other investors | Confidence |
|---|---|---|---|---|---|---|
| Dec 16, 2025 | Series C | $100M | $617M | Astera Institute | AE Ventures, Gigafund | Confirmed |
| Aug 29, 2024 | Series B | $40.0M | $381M | Gigafund | Autodesk Foundation | Reported |
| Feb 16, 2021 | Series A | $20.0M | $88.1M | Gigafund | Quiet Capital | Reported |
| Feb 25, 2020 | Seed | $3.0M | $15.0M | First Round Capital | Floodgate | Speculative |
- $100MDec 16, 2025
- $40.0MAug 29, 2024
- $20.0MFeb 16, 2021
- $3.0MFeb 25, 2020
Totals add known amounts using recorded USD conversions where available; other currencies are shown separately. A ~ marks an estimated amount.
Sources14
Profile5
- 1
PitchBook · Supports Organization · employee range, Organization · founded year, Organization · x url
“employee_range: 51-200 (profile: 75)”
- 2
Sixth-Domain · Supports Organization · country, Organization · kind
“{"country": "USA", "hq_iso2": "US", "id": "b12c1fff-2159-4777-a37a-6ce8ae9a5f8b"}”
- 3
Crunchbase · Supports Organization · employee range, Organization · hq city, Organization · x url
“employee_range: 51-200 (profile: 51-100)”
- 4
Last Energy · Supports Organization · description, Organization · linkedin url, Organization · name, Organization · website
“Last Energy is a new nuclear energy solution for customers of any size – rapidly deploying, affordable, clean, baseload power at scale with a full-service delivery model.”
- 5
LinkedIn · Supports Organization · employee range, Organization · founded year
“employee_range: 51-200 (profile: 51-200 employees)”
Products1
- 6CompanyTechnology | The PWR-20
Last Energy · Supports System
“PWR-20 # Engineered for modular, factory production. Last Energy designs a mass-production pressurized water reactor, utilizing advanced manufacturing technologies to deploy next generation nuclear power at scale.”
Funding8
- 7
MarketScreener · Dec 16, 2025 · Supports Funding round
“The company has raised $99,999,997 in a round of funding led by new investor Astera Institute”
- 8
Bloomberg · Dec 16, 2025 · Supports Funding round
“raised $100 million from investors led by Astera Institute”
- 9
Last Energy · Dec 16, 2025 · Supports Funding round · amount
“today announced it has closed an oversubscribed Series C of more than $100 million led by the Astera Institute”
- 10
Neutron Bytes · Aug 30, 2024 · Supports Funding round, Funding round · amount
“That round was led by Gigafund”
- 11
Canary Media · Aug 29, 2024 · Supports Funding round
“Venture capital heavyweight Gigafund led the round”
- 12
World Nuclear News · Aug 29, 2024 · Supports Funding round · amount
“US microreactor developer Last Energy announced it has raised USD40 million for its Series B round of funding”
- 13
Forge Global · Feb 25, 2020 · Supports Funding round · amount, Funding round · post money valuation usd
“02/25/2020 Series Seed $3M $1.01 $15M First Round Capital, Floodgate”
- 14
Crunchbase · Feb 25, 2020 · Supports Funding round
“Seed Round - Last Energy”
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