# Breakthrough Energy's Cleantech Investments: 23 Startups in Its Portfolio (2026) > The 23 Cleantech startups Breakthrough Energy has backed, by stage: $5.1B raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/breakthrough-energy-cleantech-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Stage not reported 10 - [*H* Heirloom](https://millionrounds.com/company/heirloom) - [CarbonCure Technologies](https://millionrounds.com/company/carboncure-technologies) - [Type One Energy](https://millionrounds.com/company/type-one-energy) - [Turntide Technologies](https://millionrounds.com/company/turntide-technologies) - [LanzaJet](https://millionrounds.com/company/lanzajet) - [Deep Sky](https://millionrounds.com/company/deep-sky) - [CubicPV](https://millionrounds.com/company/cubicpv) - [Mission Zero](https://millionrounds.com/company/mission-zero) - [Baseload Capital](https://millionrounds.com/company/baseload-capital) - [HyperHeat](https://millionrounds.com/company/hyperheat) ## Series A 4 - [Pacific Fusion](https://millionrounds.com/company/pacific-fusion) - [Dandelion Energy](https://millionrounds.com/company/dandelion-energy) - [Graphyte](https://millionrounds.com/company/graphyte) - [Arnergy](https://millionrounds.com/company/arnergy) ## Series B 3 - [Circ](https://millionrounds.com/company/circ) - [Aeroseal](https://millionrounds.com/company/aeroseal) - [MAX](https://millionrounds.com/company/max) ## Pre-seed and seed 2 - [Kodama Systems](https://millionrounds.com/company/kodama-systems) - [MacroCycle Technologies](https://millionrounds.com/company/macrocycle-technologies) ## Series C and later 2 - [Fervo Energy](https://millionrounds.com/company/fervo-energy) - [Zap Energy](https://millionrounds.com/company/zap-energy) ## Growth 2 - [*CF* Commonwealth Fusion Systems](https://millionrounds.com/company/commonwealth-fusion-systems) - [Terabase Energy](https://millionrounds.com/company/terabase-energy) ## Segment by segment ### Stage not reported 10 startups · $643M raised - [*H* **Heirloom**](https://millionrounds.com/company/heirloom) United States $203M - [**CarbonCure Technologies**](https://millionrounds.com/company/carboncure-technologies) CarbonCure Technologies Inc. Canada $88M - [**Type One Energy**](https://millionrounds.com/company/type-one-energy) Stellarator technology to transform energy markets with fusion power. United States $88M - [**Turntide Technologies**](https://millionrounds.com/company/turntide-technologies) Turntide Technologies develops an electric motor system designed to drive down energy consumption. United States $80M - [**LanzaJet**](https://millionrounds.com/company/lanzajet) LanzaJet is a private company founded in 2020 that focuses on sustainable fuels technology. United States $67M - [**Deep Sky**](https://millionrounds.com/company/deep-sky) Deep Sky is a developer of a CO2 removal infrastructure designed to reduce the carbon footprint. Canada $40M - [**CubicPV**](https://millionrounds.com/company/cubicpv) CubicPV is a solar manufacturing company that produces wafers and tandem modules. United States $33M - [**Mission Zero**](https://millionrounds.com/company/mission-zero) Mission Zero helps real estate facilities and their portfolio companies improve their ESG performance by eliminating waste from ca United Kingdom $28M ### Series A 4 startups · $995M raised - [**Pacific Fusion**](https://millionrounds.com/company/pacific-fusion) Pacific Fusion was founded in 2023 to deliver commercial fusion energy to power cities, businesses and homes. United States $900M - [**Dandelion Energy**](https://millionrounds.com/company/dandelion-energy) Dandelion Energy is a leading residential geothermal company based in Mount Kisco, New York. United States $56M - [**Graphyte**](https://millionrounds.com/company/graphyte) Combining photosynthesis with practical engineering, Graphyte's Carbon Casting technology provides an immediate pathway for billio United States $30M - [**Arnergy**](https://millionrounds.com/company/arnergy) Arnergy is a Nigerian cleantech company founded in 2013, headquartered in Ilupeju, Lagos. Nigeria $9.0M ### Series B 3 startups · $250M raised - [**Circ**](https://millionrounds.com/company/circ) Circ® is a textile-to-textile recycling innovator based in Danville, Virginia, founded in 2011. United States $88M - [**Aeroseal**](https://millionrounds.com/company/aeroseal) Aeroseal is a climate technology company based in Miamisburg, Ohio, with operations in 27 countries and all 50 U.S. United States $87M - [**MAX**](https://millionrounds.com/company/max) Nigeria $76M ### Pre-seed and seed 2 startups · $10M raised - [**Kodama Systems**](https://millionrounds.com/company/kodama-systems) Restoring forests for future generations United States $7.0M - [**MacroCycle Technologies**](https://millionrounds.com/company/macrocycle-technologies) MacroCycle Technologies is a cleantech company based in Cambridge, Massachusetts, founded in 2023. United States $3.0M ### Series C and later 2 startups · $1.2B raised - [**Fervo Energy**](https://millionrounds.com/company/fervo-energy) Fervo Energy develops clean energy technology to generate carbon-free energy from geothermal systems. United States $1.1B - [**Zap Energy**](https://millionrounds.com/company/zap-energy) Zap Energy is an American company founded in 2017, headquartered in Everett, Washington, with research facilities in Mukilteo and Seattle. United States $130M ### Growth 2 startups · $2.0B raised - [*CF* **Commonwealth Fusion Systems**](https://millionrounds.com/company/commonwealth-fusion-systems) United States $1.9B - [**Terabase Energy**](https://millionrounds.com/company/terabase-energy) Terabase Energy is a solar technology company based in Berkeley, California, founded in 2019. United States $130M **How this map is made.** Every startup here works in Cleantech and has raised money in a round we track that names Breakthrough Energy as an investor. Each sits under the stage of its latest round. Rebuilt nightly; updated 15 November 2026. ## More portfolio maps [All portfolios](https://millionrounds.com/portfolio-maps) [Sector portfolio **Breakthrough Energy's Energy portfolio** 25 startups · $3.8B](https://millionrounds.com/portfolio-maps/breakthrough-energy-energy-portfolio)[Portfolio map **Breakthrough Energy portfolio map** 81 startups · $14B](https://millionrounds.com/portfolio-maps/breakthrough-energy-portfolio-map)[Co-investors **Who invests with Breakthrough Energy** 67 co-investors](https://millionrounds.com/portfolio-maps/breakthrough-energy-co-investors)[Sector portfolio **Techstars' AI portfolio** 336 startups · $4.9B](https://millionrounds.com/portfolio-maps/techstars-ai-portfolio)[Sector portfolio **Alumni Ventures' AI portfolio** 302 startups · $36B](https://millionrounds.com/portfolio-maps/us-strategic-tech-fund-an-alumni-ventures-fund-ai-portfolio)[Sector portfolio **Andreessen Horowitz's AI portfolio** 259 startups · $426B](https://millionrounds.com/portfolio-maps/andreessen-horowitz-ai-portfolio) ## Raising from investors like Breakthrough Energy? 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