| # | Company | Location | Employees | Total Funding | Last Round | Last Funded |
|---|---|---|---|---|---|---|
| 1 |
Commonwealth Fusion Systems
Commonwealth Fusion Systems designs and develops commercial fusion energy system…
|
Cambridge | 1K - 5K | $2.9B | Series B | 2025-08-27 |
| 2 |
Helion Energy
Helion Energy develops fusion power technology for clean electricity generation.
|
Everett | 501 - 1K | $1.0B | Series F | 2025-01-28 |
| 3 |
Deep Isolation
Deep Isolation develops and commercializes technology to safely dispose of nucle…
|
Berkeley | 11 - 50 | $55.6M | Grant | 2026-01-13 |
| 4 |
General Fusion
General Fusion provides commercial fusion energy by developing a magnetized targ…
|
Richmond | 101 - 250 | $428.8M | Series Unknown | 2025-11-27 |
| 5 |
Allonnia
Allonnia is an environmental biotechnology company focused on metals and mining,…
|
Boston | 11 - 50 | $110.0M | Series A | 2025-12-10 |
| 6 |
CHARBONE
CHARBONE Corporation is a green hydrogen company focusing on ultra-high purity h…
|
Brossard | 11 - 50 | $63.6M | Post Ipo Debt | 2026-03-30 |
| 7 |
Sweep
Sweep is a software company developing software for businesses to reduce their c…
|
Montpellier | 101 - 250 | $100.0M | Series B | 2022-04-04 |
| 8 |
InventWood
InventWood develops cellulose-based materials for environmental.
|
College Park | 11 - 50 | $44.0M | Series A | 2025-04-30 |
| 9 |
Greenly
Greenly develops a carbon accounting platform to track, assess, manage, and redu…
|
Paris | 101 - 250 | $78.0M | Series B | 2024-03-20 |
| 10 |
Climeworks
Climeworks provides carbon removal solutions using direct air capture (DAC) tech…
|
Z├╝rich | 251 - 500 | $946.1M | Private Equity | 2025-07-02 |
| 11 |
EnergyX
EnergyX is a clean technology company that optimizes the lithium extraction proc…
|
Fort Lauderdale | 101 - 250 | $201.5M | Equity Crowdfunding | 2024-10-04 |
| 12 |
OX2
OX2 develops and sells wind and solar farms.
|
Stockholm | 251 - 500 | $76.7M | Debt Financing | 2026-02-03 |
| 13 |
44.01
4.01 is a company that specializes in eliminating CO2 from the atmosphere by min…
|
London | 11 - 50 | $48.2M | Series A | 2025-02-05 |
| 14 |
Vaulted Deep
Vaulted Deep provides proven technology solutions for permanent carbon removal t…
|
Houston | 11 - 50 | $40.3M | Series A | 2025-12-19 |
| 15 |
Aris Water Solutions
Aris Water Solutions develops and operates produced water infrastructure and rec…
|
Houston | 251 - 500 | $500.0M | Post Ipo Debt | 2025-03-11 |
| 16 |
Blue Gold
Blue Gold is a gold mining company focused on responsibly developing high-qualit…
|
Grand Cayman | — | $170.0M | Post Ipo Equity | 2026-02-26 |
| 17 |
Ramaco Resources
Ramaco Resources is a coal mining company that operates and develops metallurgic…
|
Lexington | 501 - 1K | $1.3B | Post Ipo Debt | 2025-12-30 |
| 18 |
ClimateAI
ClimateAI is an enterprise climate platform to help companies reduce, monitor, a…
|
San Francisco | 51 - 100 | $38.2M | Series B | 2023-04-13 |
| 19 |
OceanWell
OceanWell produces fresh water from the deep sea to help solve the water crisis.
|
Los Angeles | 11 - 50 | $15.0M | Series A | 2024-11-20 |
| 20 |
Carbonfuture
Carbonfuture is the world's leading provider of high-quality durable carbon remo…
|
Freiburg | 11 - 50 | $8.1M | Series A | 2025-12-19 |
| 21 |
Renewable Properties
Developing and investing in small-scale utility and commercial solar energy proj…
|
San Francisco | 11 - 50 | $118.5M | Debt Financing | 2026-01-07 |
| 22 |
Svante
Svante is a carbon capture and removal solutions provider specializing in the de…
|
Burnaby | 101 - 250 | $505.3M | Grant | 2025-09-08 |
| 23 |
Perpetua Resources
Perpetua Resources deals with exploring for gold, antimony, and other minerals i…
|
Donnelly | 11 - 50 | $1.3B | Post Ipo Equity | 2025-12-16 |
| 24 |
Blueland
Blueland is a eco-friendly refillable cleaning supply retailer.
|
New York | 101 - 250 | $23.0M | Seed | 2022-02-16 |
| 25 |
Microvast
Microvast designs, develops, and manufactures charging, battery control systems …
|
Stafford | 1K - 5K | $1.3B | Post Ipo Equity | 2025-10-03 |
| 26 |
ICE Thermal Harvesting
ICE Thermal Harvesting focuses on supplying zero-emission power in various regio…
|
Houston | 1 - 10 | $151.7M | Debt Financing | 2023-08-02 |
| 27 |
Carbon Reform
Carbon Reform is a climate-tech startup that offers a carbon capture and polluti…
|
Newark | 11 - 50 | $14.0M | Seed | 2025-03-04 |
| 28 |
Vestas
Vestas is the only global energy company dedicated exclusively to wind energy. W…
|
Aarhus | c 10001 max | $487.5M | Grant | 2024-08-27 |
| 29 |
Kairos Power
Kairos Power is an ancient Greek word that relates the importance of timeliness …
|
Alameda | 251 - 500 | $16K | Grant | 2022-06-03 |
| 30 |
1PointFive
1PointFive is a multi-solution platform for Carbon Capture, Utilization and Sequ…
|
Houston | 11 - 50 | $500.0M | Grant | 2024-09-13 |
| 31 |
Chestnut Carbon
Chestnut Carbon develops and manages reforestation and afforestation forestry pr…
|
New York | 101 - 250 | $660.0M | Series B | 2025-09-16 |
| 32 |
Apex Clean Energy
Apex Clean Energy is a renewable energy company that develops commercial-scale w…
|
Charlottesville | 251 - 500 | $1.1B | Debt Financing | 2025-10-14 |
| 33 |
Emrgy
Emrgy designs and deploys modular, scalable hydroelectric solutions.
|
Atlanta | 11 - 50 | $67.9M | Grant | 2024-09-12 |
| 34 |
Teysha Technologies
Teysha Technologies is a renewable and fully biodegradable earth-friendly plasti…
|
London | 11 - 50 | $2.1M | Grant | 2026-01-19 |
| 35 |
Carbo Culture
A biochar technology and project developer. The most scalable solution for indus…
|
Helsinki | 11 - 50 | $27.5M | Series A | 2023-11-28 |
| 36 |
Octavia Carbon
Octavia Carbon is a Direct Air Capture (DAC) company based in Kenya.
|
Nairobi | 51 - 100 | $4.6M | Seed | 2024-10-16 |
| 37 |
Avnos
Avnos is commercializing technology to capture CO2 without consuming water, prod…
|
Santa Monica | 11 - 50 | $133.0M | Debt Financing | 2025-11-06 |
| 38 |
Airbuild
Climatetech, watertech, circular economy
|
San Diego | 11 - 50 | $613K | Grant | 2025-04-14 |
| 39 |
Tokamak Energy
Tokamak Energy is a private company developing and accelerating the development …
|
Oxford | 251 - 500 | $287.0M | Series Unknown | 2024-11-19 |
| 40 |
OroraTech
OroraTech is an intelligence-as-a-service company that uses thermal data to prov…
|
Munich | 101 - 250 | $66.9M | Series B | 2025-05-14 |
| 41 |
Savimbo
Savimbo creates, certifies, and sells fair-trade carbon, biodiversity, and water…
|
Wilmington | 11 - 50 | $680K | Non Equity Assistance | 2025-05-02 |
| 42 |
Trina Solar
Trina Solar is a manufacturer of crystalline silicon photovoltaic modules and sy…
|
Changzhou | c 10001 max | $639.3M | Post Ipo Debt | 2024-09-10 |
| 43 |
Source
Source is a developer and manufacturer of solar-powered devices designed to extr…
|
Scottsdale | 101 - 250 | $364.4M | Series D | 2022-07-19 |
| 44 |
Sustainable Ocean Alliance
Sustainable Ocean Alliance advances the impact of start-ups and youth-centered i…
|
San Francisco | 11 - 50 | $17.5M | Undisclosed | 2022-06-27 |
| 45 |
Alta Resource Technologies
Alta Resource Technologies provides innovative solutions for efficient mineral s…
|
Boulder | 11 - 50 | $15.2M | Seed | 2025-05-05 |
| 46 |
Nova Pangaea Technologies
Nova Pangaea Technologies is a cleantech company that has developed a sustainabl…
|
Wilton | 11 - 50 | $49.2M | Series A | 2023-11-21 |
| 47 |
Robigo
Robigo is a biomanufacturing company engineering microbes to create more sustain…
|
Cambridge | 11 - 50 | $8.0M | Seed | 2024-03-20 |
| 48 |
Mombak
Mombak is a carbon removal company that specializes in large-scale reforestation…
|
São Paulo | 51 - 100 | $149.8M | Series A | 2025-04-29 |
| 49 |
Mast Reforestation
Mast Reforestation is a tech-led reforestation company that provides seedling, p…
|
Seattle | 51 - 100 | $83.9M | Series B | 2025-02-11 |
| 50 |
Coral Vita
Coral Vita grows corals in land-based farms, which provides crucial advantages f…
|
San Diego | 11 - 50 | $10.0M | Series A | 2025-06-06 |