Sector portfolio · Accelerator · United States
Cleantech Open's Cleantech portfolio
Cleantech Open has backed 19 Cleantech startups in rounds we track, $132M between them, shown by the stage each has reached. The best-funded is Electriq Power.
Funding by segment
- Stage not reported$75M13
- Pre-seed and seed$57M6
Where they are based
- United States14$107M
- South Africa2$330K
- Puerto Rico1$21M
- Denmark1$3.0M
- France1$792K
United States
South Africa
Puerto Rico
Denmark
FranceFounded
2 without a founding year on record.
Total raised
- Under $1M11
- $1M to $10M5
- $10M to $50M2
- $50M to $250M1
- $250M to $1B0
- $1B and over0
Each dot is a startup: the year it was founded across, the total it has raised up (each line is ten times the one below). Pick a segment to pick it out.
16 of 19 startups shown; the rest have no founding year or amount on record.
- 1 to 2
- 3 to 7
- 8 to 24
- 25 to 99
- 100 and more
- United States14
- South Africa2
- Puerto Rico1
- Denmark1
- France1
Startups by country, 5 countries in all.
Segment by segment
Stage not reported
13 startups · $75M raised
OxEon EnergyOxEon Energy is a cleantech start-up that works on alternative energy storage, synthetic fuels, and high purity gas production.United States$36M
Barrio EléctricoBarrio Eléctrico offers residential solar-plus-storage leases, relying on community engagement to support the systems.Puerto Rico$21M
VoltpostVoltpost transforms lampposts into smart electric vehicle charging stations to make them accessible to people.United States$4.9M
Littoral Power SystemsLittoral Power Systems designs, manufactures, and installs distributed power systems.United States$4.0M
EcospearsecoSPEARS is a cleantech and environmental technology company founded in 2017, focused on developing sustainable solutions to permUnited States$4.0M
STAC TechnologySTACs Technology zero-emissions cooling solutions upcycle the District Energy industry's services and reachDenmark$3.0M
Katz Water TechnologiesKatz Water Technologies purifies water using streamlined simplified equipment that utilizes waste energy.United States$750K
NativusHyper-efficient Air-Conditioning Hardware CompanyUnited States$480K
Pre-seed and seed
6 startups · $57M raised
ElectrIQ PowerElectriq Power is a provider of smart home battery storage solution for homes and small businesses.United States$51M
RenewWestRenewWest is an environmental services company founded in 2015, focusing on nature-based climate solutions.United States$3.2M
GRAIN EcosystemGrain Ecosystem is a digital platform focused on facilitating profitable decarbonization.United States$880K
Sol ClaritySol Clarity specializes in the development and production of self-cleaning solar.United States$800K
TechnoCarbonTechnoCarbon is a cleantech SAS company.France$792K
Brayfoil TechnologiesBrayfoil 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.
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