# Lowercarbon Capital's Cleantech Investments: 18 Startups in Its Portfolio (2026) > The 18 Cleantech startups Lowercarbon Capital has backed, by stage: $3.5B raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/lowercarbon-capital-cleantech-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Series A 6 - [Pacific Fusion](https://millionrounds.com/company/pacific-fusion) - [Mombak](https://millionrounds.com/company/mombak) - [*AF* Acceleron Fusion](https://millionrounds.com/company/acceleron-fusion) - [Renaissance Fusion](https://millionrounds.com/company/renaissance-fusion) - [Noya](https://millionrounds.com/company/noya) - [Safi](https://millionrounds.com/company/safi) ## Stage not reported 5 - [*H* Heirloom](https://millionrounds.com/company/heirloom) - [Vaulted Deep](https://millionrounds.com/company/vaulted-deep) - [Lumen Energy](https://millionrounds.com/company/lumen-energy) - [Seabound](https://millionrounds.com/company/seabound) - [Running Tide](https://millionrounds.com/company/running-tide) ## Pre-seed and seed 3 - [Lun](https://millionrounds.com/company/lun) - [Milvus Advanced](https://millionrounds.com/company/milvus-advanced) - [Clairity Technology](https://millionrounds.com/company/clairity-technology) ## Series C and later 2 - [Zap Energy](https://millionrounds.com/company/zap-energy) - [SolarSquare](https://millionrounds.com/company/solarsquare) ## Growth 2 - [*CF* Commonwealth Fusion Systems](https://millionrounds.com/company/commonwealth-fusion-systems) - [Undo](https://millionrounds.com/company/undo) ## Segment by segment ### Series A 6 startups · $1.1B 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 - [**Mombak**](https://millionrounds.com/company/mombak) MOMBAK is a Brazilian carbon removal startup founded in 2021 by Gabriel Silva and Peter Fernandez, headquartered in São Paulo. Brazil $86M - [*AF* **Acceleron Fusion**](https://millionrounds.com/company/acceleron-fusion) United States $39M - [**Renaissance Fusion**](https://millionrounds.com/company/renaissance-fusion) Renaissance Fusion is a high-temperature superconductor and stellarator company. France $35M - [**Noya**](https://millionrounds.com/company/noya) Noya, also known as Noya Labs, is a climate technology company founded in 2020 and headquartered in San Francisco, California. United States $22M - [**Safi**](https://millionrounds.com/company/safi) Sustainable clothing start-up brand inspired by vintage trends with a modern twist United Kingdom $20M ### Stage not reported 5 startups · $275M raised - [*H* **Heirloom**](https://millionrounds.com/company/heirloom) United States $203M - [**Vaulted Deep**](https://millionrounds.com/company/vaulted-deep) Vaulted Deep is a Houston-based company specializing in carbon removal and waste management. United States $67M - [**Lumen Energy**](https://millionrounds.com/company/lumen-energy) Lumen Energy focuses on helping building owners save money with clean energy. United States $3.0M - [**Seabound**](https://millionrounds.com/company/seabound) Seabound is a carbon capture technology company. United Kingdom $1.5M - [**Running Tide**](https://millionrounds.com/company/running-tide) The global ocean health company harnessing the power of ocean for a climate positive future. United States $250K ### Pre-seed and seed 3 startups · $25M raised - [**Lun**](https://millionrounds.com/company/lun) Lun Energy is a Danish climate technology startup based in Copenhagen, founded in 2021 by Martin Collignon and Anders Valentin. Denmark $11M - [**Milvus Advanced**](https://millionrounds.com/company/milvus-advanced) Milvus Advanced is a UK-based deeptech company located in Oxford, specializing in the production of high-performance nanomaterials. United Kingdom $6.9M - [**Clairity Technology**](https://millionrounds.com/company/clairity-technology) Clairity Technology is a climate-tech startup founded in 2022 and based in Los Angeles, California. United States $6.8M ### Series C and later 2 startups · $228M raised - [**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 - [**SolarSquare**](https://millionrounds.com/company/solarsquare) SolarSquare is a Mumbai-based residential solar company founded in 2015. India $98M ### Growth 2 startups · $1.9B raised - [*CF* **Commonwealth Fusion Systems**](https://millionrounds.com/company/commonwealth-fusion-systems) United States $1.9B - [**Undo**](https://millionrounds.com/company/undo) Undo is the time travel debugging company for Linux. United Kingdom $57M **How this map is made.** Every startup here works in Cleantech and has raised money in a round we track that names Lowercarbon Capital 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 **Lowercarbon Capital's Energy portfolio** 10 startups · $3.2B](https://millionrounds.com/portfolio-maps/lowercarbon-capital-energy-portfolio)[Sector portfolio **Lowercarbon Capital's Agtech portfolio** 10 startups · $424M](https://millionrounds.com/portfolio-maps/lowercarbon-capital-agtech-portfolio)[Co-investors **Who invests with Lowercarbon Capital** 85 co-investors](https://millionrounds.com/portfolio-maps/lowercarbon-capital-co-investors)[Portfolio map **Lowercarbon Capital portfolio map** 76 startups · $9.9B](https://millionrounds.com/portfolio-maps/lowercarbon-capital-portfolio-map)[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) ## Raising from investors like Lowercarbon Capital? 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