# Cleantech Open's Energy Investments: 16 Startups in Its Portfolio (2026) > The 16 Energy startups Cleantech Open has backed, by stage: $36M raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/cleantech-open-energy-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Stage not reported 11 - [Enzinc](https://millionrounds.com/company/enzinc) - [RePurpose Energy](https://millionrounds.com/company/repurpose-energy) - [Thiozen](https://millionrounds.com/company/thiozen) - [Inergy Technology](https://millionrounds.com/company/inergy-technology) - [Pecos Wind Power](https://millionrounds.com/company/pecos-wind-power) - [Helix Power](https://millionrounds.com/company/helix-power) - [SolarKal](https://millionrounds.com/company/solarkal) - [4th State Energies](https://millionrounds.com/company/4th-state-energies) - [Advanced Silicon Group](https://millionrounds.com/company/advanced-silicon-group) - [OXbyEL Technologies](https://millionrounds.com/company/oxbyel-technologies) - [HiT Nano](https://millionrounds.com/company/hit-nano) ## Pre-seed and seed 5 - [Sinergy Flow](https://millionrounds.com/company/sinergy-flow) - [Switched Source](https://millionrounds.com/company/switched-source) - [Orus Energy](https://millionrounds.com/company/orus-energy) - [Correlate](https://millionrounds.com/company/correlate) - [TouchLight](https://millionrounds.com/company/touchlight) ## Segment by segment ### Stage not reported 11 startups · $22M raised - [**Enzinc**](https://millionrounds.com/company/enzinc) Enzinc is an advanced battery developer that offers rechargeable zinc-air batteries. United States $8.3M - [**RePurpose Energy**](https://millionrounds.com/company/repurpose-energy) RePurpose Energy reuses electric vehicle batteries to create lower-cost, more sustainable "second life" solar energy storage systems. United States $6.3M - [**Thiozen**](https://millionrounds.com/company/thiozen) Thiozen develops novel hydrogen gas production technology designed to reduce greenhouse gases. United States $3.2M - [**Inergy Technology**](https://millionrounds.com/company/inergy-technology) The leader in portable, consumer energy storage solutions. United States $1.5M - [**Pecos Wind Power**](https://millionrounds.com/company/pecos-wind-power) Pecos Wind Power designs, builds, and sells wind turbines for distributed generation. United States $1.1M - [**Helix Power**](https://millionrounds.com/company/helix-power) Helix Power is a development stage company designing a next generation power management platform using flywheel technology. United States $531K - [**SolarKal**](https://millionrounds.com/company/solarkal) SolarKal is the largest B2B solar energy marketplace in the US, connecting organizations to solar providers who compete for their business. United States $500K - [**4th State Energies**](https://millionrounds.com/company/4th-state-energies) 4th 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 - [**Sinergy Flow**](https://millionrounds.com/company/sinergy-flow) Sinergy Flow is a Milan-based DeepTech startup founded in 2022, specializing in low-cost, sustainable redox flow batteries (RFBs) Italy $8.3M - [**Switched Source**](https://millionrounds.com/company/switched-source) Switched Source is a manufacturing company that develops medium-voltage devices to enhance utility operations through automation. United States $2.6M - [**Orus Energy**](https://millionrounds.com/company/orus-energy) Orus Energy leverages the power of AI to unlock potential of electrical flexibility in commercial buildings. France $2.4M - [**Correlate**](https://millionrounds.com/company/correlate) Correlate is a real-time collaboration software that allows distributed teams to organize, share and retain all of their knowledge. United States $508K - [**TouchLight**](https://millionrounds.com/company/touchlight) TouchLight 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. ## More portfolio maps [All portfolios](https://millionrounds.com/portfolio-maps) [Sector portfolio **Cleantech Open's Cleantech portfolio** 19 startups · $132M](https://millionrounds.com/portfolio-maps/cleantech-open-cleantech-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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