Sector portfolio · Accelerator · United States

Cleantech Open's Energy portfolio

Cleantech Open has backed 16 Energy startups in rounds we track, $36M between them, shown by the stage each has reached. The best-funded is Proof Energy.

16startups backed
2stages
$36Mraised between them
Stage not reportedbiggest stage

Cleantech Open's whole portfolioCleantech Open's profile

Stage not reported

11

Pre-seed and seed

5

Segment by segment

Stage not reported

11 startups · $22M raised

  1. EnzincEnzinc is an advanced battery developer that offers rechargeable zinc-air batteries.United States$8.3M
  2. RePurpose EnergyRePurpose Energy reuses electric vehicle batteries to create lower-cost, more sustainable "second life" solar energy storage systems.United States$6.3M
  3. ThiozenThiozen develops novel hydrogen gas production technology designed to reduce greenhouse gases.United States$3.2M
  4. Inergy TechnologyThe leader in portable, consumer energy storage solutions.United States$1.5M
  5. Pecos Wind PowerPecos Wind Power designs, builds, and sells wind turbines for distributed generation.United States$1.1M
  6. Helix PowerHelix Power is a development stage company designing a next generation power management platform using flywheel technology.United States$531K
  7. SolarKalSolarKal is the largest B2B solar energy marketplace in the US, connecting organizations to solar providers who compete for their business.United States$500K
  8. 4th State Energies4th State Energies is a company that produces additives enabling immediate improvement in battery performance.United States$200K

Pre-seed and seed

5 startups · $14M raised

  1. Sinergy FlowSinergy Flow is a Milan-based DeepTech startup founded in 2022, specializing in low-cost, sustainable redox flow batteries (RFBs) Italy$8.3M
  2. Switched SourceSwitched Source is a manufacturing company that develops medium-voltage devices to enhance utility operations through automation.United States$2.6M
  3. Orus EnergyOrus Energy leverages the power of AI to unlock potential of electrical flexibility in commercial buildings.France$2.4M
  4. CorrelateCorrelate is a real-time collaboration software that allows distributed teams to organize, share and retain all of their knowledge.United States$508K
  5. TouchLightTouchLight is a provider of carbon neutrality and grid edge solutions.-$330K

How this map is made. Every startup here works in Energy 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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