# Cleantech Open's Cleantech Investments: 19 Startups in Its Portfolio (2026) > The 19 Cleantech startups Cleantech Open has backed, by stage: $132M raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/cleantech-open-cleantech-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Stage not reported 13 - [OxEon Energy](https://millionrounds.com/company/oxeon-energy) - [Barrio Eléctrico](https://millionrounds.com/company/barrio-electrico) - [Voltpost](https://millionrounds.com/company/voltpost) - [Littoral Power Systems](https://millionrounds.com/company/littoral-power-systems) - [Ecospears](https://millionrounds.com/company/ecospears) - [STAC Technology](https://millionrounds.com/company/stac-technology) - [Katz Water Technologies](https://millionrounds.com/company/katz-water-technologies) - [Nativus](https://millionrounds.com/company/nativus) - [MicroEra Power](https://millionrounds.com/company/microera-power) - [T-Omega Wind](https://millionrounds.com/company/t-omega-wind) - [*A* AdvanceH20](https://millionrounds.com/company/advanceh20) - [Elateq](https://millionrounds.com/company/elateq) - [Mirai Solar](https://millionrounds.com/company/mirai-solar) ## Pre-seed and seed 6 - [ElectrIQ Power](https://millionrounds.com/company/electriq-power) - [RenewWest](https://millionrounds.com/company/renewwest) - [GRAIN Ecosystem](https://millionrounds.com/company/grain-ecosystem) - [Sol Clarity](https://millionrounds.com/company/sol-clarity) - [TechnoCarbon](https://millionrounds.com/company/technocarbon) - [Brayfoil Technologies](https://millionrounds.com/company/brayfoil-technologies) ## Segment by segment ### Stage not reported 13 startups · $75M raised - [**OxEon Energy**](https://millionrounds.com/company/oxeon-energy) OxEon Energy is a cleantech start-up that works on alternative energy storage, synthetic fuels, and high purity gas production. United States $36M - [**Barrio Eléctrico**](https://millionrounds.com/company/barrio-electrico) Barrio Eléctrico offers residential solar-plus-storage leases, relying on community engagement to support the systems. Puerto Rico $21M - [**Voltpost**](https://millionrounds.com/company/voltpost) Voltpost transforms lampposts into smart electric vehicle charging stations to make them accessible to people. United States $4.9M - [**Littoral Power Systems**](https://millionrounds.com/company/littoral-power-systems) Littoral Power Systems designs, manufactures, and installs distributed power systems. United States $4.0M - [**Ecospears**](https://millionrounds.com/company/ecospears) ecoSPEARS is a cleantech and environmental technology company founded in 2017, focused on developing sustainable solutions to perm United States $4.0M - [**STAC Technology**](https://millionrounds.com/company/stac-technology) STACs Technology zero-emissions cooling solutions upcycle the District Energy industry's services and reach Denmark $3.0M - [**Katz Water Technologies**](https://millionrounds.com/company/katz-water-technologies) Katz Water Technologies purifies water using streamlined simplified equipment that utilizes waste energy. United States $750K - [**Nativus**](https://millionrounds.com/company/nativus) Hyper-efficient Air-Conditioning Hardware Company United States $480K ### Pre-seed and seed 6 startups · $57M raised - [**ElectrIQ Power**](https://millionrounds.com/company/electriq-power) Electriq Power is a provider of smart home battery storage solution for homes and small businesses. United States $51M - [**RenewWest**](https://millionrounds.com/company/renewwest) RenewWest is an environmental services company founded in 2015, focusing on nature-based climate solutions. United States $3.2M - [**GRAIN Ecosystem**](https://millionrounds.com/company/grain-ecosystem) Grain Ecosystem is a digital platform focused on facilitating profitable decarbonization. United States $880K - [**Sol Clarity**](https://millionrounds.com/company/sol-clarity) Sol Clarity specializes in the development and production of self-cleaning solar. United States $800K - [**TechnoCarbon**](https://millionrounds.com/company/technocarbon) TechnoCarbon is a cleantech SAS company. France $792K - [**Brayfoil Technologies**](https://millionrounds.com/company/brayfoil-technologies) Brayfoil Technologies is a South African company based in Johannesburg, founded in 2017. South Africa $300K **How this map is made.** Every startup here works in Cleantech and has raised money in a round we track that names Cleantech Open 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 **Cleantech Open's Energy portfolio** 16 startups · $36M](https://millionrounds.com/portfolio-maps/cleantech-open-energy-portfolio)[Portfolio map **Cleantech Open portfolio map** 82 startups · $353M](https://millionrounds.com/portfolio-maps/cleantech-open-portfolio-map)[Co-investors **Who invests with Cleantech Open** 21 co-investors](https://millionrounds.com/portfolio-maps/cleantech-open-co-investors)[Sector portfolio **Y Combinator's AI portfolio** 1,143 startups · $44B](https://millionrounds.com/portfolio-maps/y-combinator-ai-portfolio)[Sector portfolio **Y Combinator's Fintech portfolio** 338 startups · $24B](https://millionrounds.com/portfolio-maps/y-combinator-fintech-portfolio)[Sector portfolio **Plug and Play's AI portfolio** 223 startups · $14B](https://millionrounds.com/portfolio-maps/plug-and-play-ai-portfolio) ## Raising from investors like Cleantech Open? 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