| # | Company | Location | Employees | Total Funding | Last Round | Last Funded |
|---|---|---|---|---|---|---|
| 1 |
Oklo
Oklo specializes in designing and developing small modular reactors for advanced…
|
Santa Clara | — | $440.6M | Post Ipo Equity | 2025-06-12 |
| 2 |
SB Energy
SB Energy is a digital infrastructure and energy platform that develops, constru…
|
Redwood City | — | $4.0B | Corporate Round | 2026-01-09 |
| 3 |
Radiant
Radiant develops portable nuclear microreactors designed to generate electricity…
|
El Segundo | 101 - 250 | $518.8M | Series Unknown | 2026-02-17 |
| 4 |
LanzaTech
LanzaTech is a carbon recycling company that converts waste carbon into sustaina…
|
Skokie | 251 - 500 | $1.3B | Post Ipo Equity | 2026-01-22 |
| 5 |
Commonwealth Fusion Systems
Commonwealth Fusion Systems designs and develops commercial fusion energy system…
|
Cambridge | 1K - 5K | $2.9B | Series B | 2025-08-27 |
| 6 |
Masdar
Masdar is a state-owned renewable energy company that develops and operates sola…
|
Abu Dhabi | 501 - 1K | $3.3B | Debt Financing | 2025-05-16 |
| 7 |
X-energy
X-energy is a nuclear energy company that develops small modular nuclear reactor…
|
Rockville | 501 - 1K | $1.7B | Series D | 2025-11-24 |
| 8 |
PowerBank
PowerBank is a renewable and clean energy company that designs, constructs, and …
|
Toronto | 11 - 50 | $61.8M | Grant | 2026-04-07 |
| 9 |
Type One Energy
Stellarator technology to transform energy markets with fusion power.
|
Oak Ridge | 51 - 100 | $169.5M | Convertible Note | 2026-01-14 |
| 10 |
Sage Geosystems
Sage Geosystems develops geothermal and energy storage technologies that use sub…
|
Houston | 11 - 50 | $114.0M | Series B | 2026-01-21 |
| 11 |
Aspen Power
Aspen Power Partners is a distributed generation platform with the dual mission …
|
Dallas | 51 - 100 | $1.1B | Debt Financing | 2026-01-12 |
| 12 |
Last Energy
Last Energy is a nuclear technology company that provides nuclear energy through…
|
Washington | 101 - 250 | $164.0M | Series C | 2025-12-16 |
| 13 |
Deep Isolation
Deep Isolation develops and commercializes technology to safely dispose of nucle…
|
Berkeley | 11 - 50 | $55.6M | Grant | 2026-01-13 |
| 14 |
TerraPower
TerraPower is a nuclear energy technology firm that focuses on developing a sust…
|
Bellevue | 501 - 1K | $1.5B | Secondary Market | 2026-01-20 |
| 15 |
ElectricFish
We build resilient and flexible EV charging infrastructure to accelerate decarbo…
|
San Carlos | 11 - 50 | $2.7M | Seed | 2025-04-29 |
| 16 |
ReNew
ReNew is a renewable energy company that focuses on solar & wind-energy projects…
|
Gurgaon | 1K - 5K | $13.7B | Post Ipo Equity | 2026-03-16 |
| 17 |
AirJoule Technologies
AirJoule Technologies develops a climate-solution technology that harvests the u…
|
Montana Mines | 11 - 50 | $47.0M | Post Ipo Equity | 2026-01-14 |
| 18 |
TAE Technologies
TAE Technologies is leveraging proprietary science and engineering to tackle the…
|
Foothill Ranch | 251 - 500 | $1.5B | Series Unknown | 2025-06-02 |
| 19 |
Sun King
Sun King designs, distributes, installs, and finances solar energy solutions for…
|
Nairobi | 1K - 5K | $990.0M | Private Equity | 2025-12-11 |
| 20 |
EcoFlow Tech
EcoFlow provides designs, develops and manufactures eco-friendly and affordable …
|
San Francisco | 1K - 5K | $114.4M | Product Crowdfunding | 2021-09-01 |
| 21 |
Origis Energy
Origis Energy develops and operates solar power plants to provide renewable ener…
|
Miami | 251 - 500 | $5.4B | Undisclosed | 2026-04-08 |
| 22 |
Acumen
Acumen is a non-profit venture fund that uses entrepreneurial approaches to solv…
|
New York | 101 - 250 | $20.0M | Debt Financing | 2025-09-23 |
| 23 |
Focused Energy
Focused Energy pioneers laser-driven fusion for clean power, using inertial conf…
|
Austin | 11 - 50 | $121.7M | Corporate Round | 2024-12-17 |
| 24 |
United Solar Polysilicon
United Solar Polysilicon is a clean energy company that provides focused on phot…
|
Sohar | 1K - 5K | $2.1B | Debt Financing | 2026-01-19 |
| 25 |
Eavor
Eavor is a geothermal energy solution provider that develops a closed-loop syste…
|
Calgary | 51 - 100 | $569.2M | Series Unknown | 2025-06-03 |
| 26 |
Terrestrial Energy
Terrestrial Energy is a developer of a reactor power plant technology to provide…
|
Oakville | 51 - 100 | $156.6M | Post Ipo Equity | 2025-10-28 |
| 27 |
Solstice
Solstice provides turnkey customer solutions for shared solar.
|
Cambridge | 11 - 50 | $4.8M | Grant | 2024-07-23 |
| 28 |
Amogy
Amogy offers carbon-free energy solutions using ammonia cracking technology.
|
Brooklyn | 101 - 250 | $313.3M | Series Unknown | 2025-11-17 |
| 29 |
Atlas Renewable Energy
Atlas Renewable Energy is a renewable energy company that develops, builds, and …
|
Miami | 101 - 250 | $5.0B | Debt Financing | 2026-04-10 |
| 30 |
Zero Homes
Zero Homes is a technology company that develops an end-to-end digital platform …
|
Denver | 11 - 50 | $17.1M | Series A | 2026-02-17 |
| 31 |
Mainspring Energy
Mainspring Energy provides power generation technology using linear generators f…
|
Menlo Park | 251 - 500 | $813.0M | Series F | 2025-04-14 |
| 32 |
Crux
Crux is a capital market company that provides debit marketplace,transferable ta…
|
New York | 11 - 50 | $77.0M | Series B | 2025-04-16 |
| 33 |
Ultraviolette Automotive
Ultraviolette Automotive is a manufacturer of high-performance electric two-whee…
|
Bangalore | 251 - 500 | $135.2M | Series E | 2025-12-03 |
| 34 |
GrowUp Farms
We’re turning food production on its head to make way better food, that doesn’t …
|
Bristol | 51 - 100 | $187.4M | Private Equity | 2024-07-17 |
| 35 |
Newcleo
Newcleo is an atomic energy company that focuses on developing advanced nuclear …
|
Paris | 1K - 5K | $765.7M | Series B | 2026-02-03 |
| 36 |
Lydian
Lydian is the electric fuels company, developing the lowest cost SAF from CO2, w…
|
Salem | 11 - 50 | $55.8M | Series Unknown | 2026-01-06 |
| 37 |
Blykalla
small modular reactors, clean energy, deep tech
|
Stockholm | 11 - 50 | $57.3M | Series Unknown | 2025-12-18 |
| 38 |
Arcadia
Arcadia is a climate software and data company that specializes in decarbonizing…
|
Greenwood Village | 501 - 1K | $575.5M | Series E | 2024-04-11 |
| 39 |
South 8 Technologies
South 8 sells LiGas®, a liquefied gas electrolyte for Lithium-ion batteries. LiG…
|
San Diego | 11 - 50 | $37.0M | Grant | 2026-04-02 |
| 40 |
Helical Fusion
Helical Fusion is a startup company that aims to commercialize fusion energy usi…
|
Tokyo | 11 - 50 | $40.6M | Series A | 2025-12-04 |
| 41 |
DG Matrix
DG Matrix develops solid-state power conversion systems for electric vehicle cha…
|
Raleigh | 251 - 500 | $80.0M | Series A | 2026-02-18 |
| 42 |
Brimstone
Brimstone is a hardware cleantech startup that aims to reduce CO2 emissions thro…
|
Berkeley | 51 - 100 | $244.0M | Undisclosed | 2025-08-04 |
| 43 |
Proxima Fusion
Proxima Fusion develops stellarator-based fusion reactors to deliver clean, cont…
|
Munich | 51 - 100 | $223.1M | Series A | 2025-09-09 |
| 44 |
GridX
GridX is a provider of cloud-based business operations support tools to utilitie…
|
Milpitas | 101 - 250 | $52.5M | Series C | 2022-04-14 |
| 45 |
Greentown Labs
Greentown Labs is a climate technology incubator that seeks to invest in the cle…
|
Somerville | 11 - 50 | $5.0M | Grant | 2024-12-18 |
| 46 |
Thea Energy
Thea Energy is taking a faster approach to commercialize fusion energy.
|
Kearny | 51 - 100 | $20.0M | Series B | 2026-02-28 |
| 47 |
Stegra
Stegra operates a steel production plant to accelerate the decarbonization of th…
|
Stockholm | 251 - 500 | $11.0B | Grant | 2025-11-26 |
| 48 |
The Nuclear Company
The Nuclear Company enables the deployment of nuclear power plants at fleet-scal…
|
Lexington | 11 - 50 | $46.3M | Series A | 2025-05-15 |
| 49 |
ChargerHelp!
ChargerHelp! provides on-demand repairs and maintenance support from trained and…
|
Los Angeles | 51 - 100 | $20.2M | Series A | 2023-02-14 |
| 50 |
Sealed
Sealed is a residential energy efficiency startup that designs, manages, and fin…
|
New York | 51 - 100 | $97.5M | Series B | 2024-03-15 |