# US Department of Energy's Cleantech Investments: 43 Startups in Its Portfolio (2026) > The 43 Cleantech startups US Department of Energy has backed, by stage: $3.0B raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/u-s-department-of-energy-cleantech-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Stage not reported 32 - [The Appalachian Regional Clean Hydrogen Hub](https://millionrounds.com/company/the-appalachian-regional-clean-hydrogen-hub) - [1PointFive](https://millionrounds.com/company/1pointfive) - [ICE Thermal Harvesting](https://millionrounds.com/company/ice-thermal-harvesting) - [Skyven Technologies](https://millionrounds.com/company/skyven-technologies) - [Type One Energy](https://millionrounds.com/company/type-one-energy) - [Terrestrial Energy](https://millionrounds.com/company/terrestrial-energy) - [LanzaJet](https://millionrounds.com/company/lanzajet) - [AirCapture](https://millionrounds.com/company/aircapture) - [OxEon Energy](https://millionrounds.com/company/oxeon-energy) - [Pacific Northwest Hydrogen Association](https://millionrounds.com/company/pacific-northwest-hydrogen-association) - [Barrio Eléctrico](https://millionrounds.com/company/barrio-electrico) - [Sunwealth Power](https://millionrounds.com/company/sunwealth-power) - [Daphne Technology](https://millionrounds.com/company/daphne-technology) - [Alpen High Performance Products](https://millionrounds.com/company/alpen-high-performance-products) - [Amermin](https://millionrounds.com/company/amermin) - [Encino Environmental Services](https://millionrounds.com/company/encino-environmental-services) - [Relevate Power](https://millionrounds.com/company/relevate-power) - [Littoral Power Systems](https://millionrounds.com/company/littoral-power-systems) - [Triton Anchor](https://millionrounds.com/company/triton-anchor) - [Transitional Energy](https://millionrounds.com/company/transitional-energy) - [*AF* Alder Fuels](https://millionrounds.com/company/alder-fuels) - [Blue Biofuels](https://millionrounds.com/company/blue-biofuels) - [Resilient Power Systems](https://millionrounds.com/company/resilient-power-systems) - [Stepwise](https://millionrounds.com/company/stepwise) +8 more ## Series A 5 - [Focused Energy](https://millionrounds.com/company/focused-energy) - [Capture6](https://millionrounds.com/company/capture6) - [Hyliion](https://millionrounds.com/company/hyliion) - [Power to Hydrogen](https://millionrounds.com/company/power-to-hydrogen) - [Zero Homes](https://millionrounds.com/company/zero-homes) ## Pre-seed and seed 4 - [Gradient](https://millionrounds.com/company/gradient) - [Helix Earth](https://millionrounds.com/company/helix-earth) - [NOMAD Transportable Power Systems](https://millionrounds.com/company/nomad-transportable-power-systems) - [EELI Technology](https://millionrounds.com/company/eeli-technology) ## Series B 2 - [Quaise Energy](https://millionrounds.com/company/quaise-energy) - [Mazama Energy](https://millionrounds.com/company/mazama-energy) ## Segment by segment ### Stage not reported 32 startups · $2.2B raised - [**The Appalachian Regional Clean Hydrogen Hub**](https://millionrounds.com/company/the-appalachian-regional-clean-hydrogen-hub) ARCH2's mission is to provide an interconnected, full value chain H2Hub solution. United States $925M - [**1PointFive**](https://millionrounds.com/company/1pointfive) 1PointFive is a multi-solution platform for Carbon Capture, Utilization and Sequestration (CCUS) that provides decarbonization solutions. United States $500M - [**ICE Thermal Harvesting**](https://millionrounds.com/company/ice-thermal-harvesting) ICE Thermal Harvesting focuses on supplying zero-emission power in various regions around the world. United States $150M - [**Skyven Technologies**](https://millionrounds.com/company/skyven-technologies) Skyven Technologies is an energy-as-a-service company with a mission to decarbonize industrial process heat. United States $145M - [**Type One Energy**](https://millionrounds.com/company/type-one-energy) Stellarator technology to transform energy markets with fusion power. United States $88M - [**Terrestrial Energy**](https://millionrounds.com/company/terrestrial-energy) Terrestrial Energy is a developer of a reactor power plant technology to provide carbon-free energy for the global industry. Canada $76M - [**LanzaJet**](https://millionrounds.com/company/lanzajet) LanzaJet is a private company founded in 2020 that focuses on sustainable fuels technology. United States $67M - [**AirCapture**](https://millionrounds.com/company/aircapture) Aircapture is a climate technology company based in Berkeley, California, founded in 2019. United States $50M ### Series A 5 startups · $369M raised - [**Focused Energy**](https://millionrounds.com/company/focused-energy) Focused Energy is a German-American deep-tech startup founded in 2021, specializing in laser-driven inertial confinement fusion (ICF). Germany $280M - [**Capture6**](https://millionrounds.com/company/capture6) Capture6 is a climate technology company based in Berkeley, California, and Rotorua, New Zealand. United States $28M - [**Hyliion**](https://millionrounds.com/company/hyliion) Creating innovative generator solutions that enable clean, flexible, and affordable electricity production. United States $27M - [**Power to Hydrogen**](https://millionrounds.com/company/power-to-hydrogen) Power to Hydrogen develops advanced AEM electrolyzers that integrate with renewables while eliminating precious, expensive metals. United States $18M - [**Zero Homes**](https://millionrounds.com/company/zero-homes) Zero Homes is a technology company based in Denver, founded in 2021-2022. United States $17M ### Pre-seed and seed 4 startups · $46M raised - [**Gradient**](https://millionrounds.com/company/gradient) United States $24M - [**Helix Earth**](https://millionrounds.com/company/helix-earth) Helix Earth Technologies, Inc. United States $12M - [**NOMAD Transportable Power Systems**](https://millionrounds.com/company/nomad-transportable-power-systems) NOMAD Transportable Power Systems offers patent-pending technologies to fit any project or application need. United States $7.4M - [**EELI Technology**](https://millionrounds.com/company/eeli-technology) EELI Technology, a Silicon Valley-based mining technology company, develops Advanced Lithium Recovery solutions, making lithium pr United States $2.0M ### Series B 2 startups · $351M raised - [**Quaise Energy**](https://millionrounds.com/company/quaise-energy) Quaise Energy is a technology company founded in 2018, originating from the MIT Plasma Science and Fusion Center. United States $180M - [**Mazama Energy**](https://millionrounds.com/company/mazama-energy) Mazama Energy is a geothermal developer founded in March 2023 and based in Frisco, Texas, with a corporate office in Plano. United States $171M **How this map is made.** Every startup here works in Cleantech and has raised money in a round we track that names US Department of 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 **US Department of Energy's Energy portfolio** 69 startups · $14B](https://millionrounds.com/portfolio-maps/u-s-department-of-energy-energy-portfolio)[Sector portfolio **US Department of Energy's Chemicals & Materials portfolio** 32 startups · $1.0B](https://millionrounds.com/portfolio-maps/u-s-department-of-energy-chemicals-materials-portfolio)[Sector portfolio **US Department of Energy's Manufacturing portfolio** 17 startups · $2.6B](https://millionrounds.com/portfolio-maps/u-s-department-of-energy-manufacturing-portfolio)[Sector portfolio **US Department of Energy's Big Data & Analytics portfolio** 16 startups · $19M](https://millionrounds.com/portfolio-maps/u-s-department-of-energy-big-data-analytics-portfolio)[Sector portfolio **US Department of Energy's AI portfolio** 13 startups · $457M](https://millionrounds.com/portfolio-maps/u-s-department-of-energy-ai-portfolio)[Sector portfolio **US Department of Energy's Biotech portfolio** 13 startups · $109M](https://millionrounds.com/portfolio-maps/u-s-department-of-energy-biotech-portfolio) ## Raising from investors like US Department of Energy? 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