# Cleantech Open: portfolio, investments and team

> Cleantech Open is an accelerator based in United States. 165 investments on record, 17 in the last 12 months, latest Sept 2026.

Source: https://millionrounds.com/fund/cleantech-open (Millionrounds; every figure on the page links to its filing or article)

United States · [Investor](https://millionrounds.com/investors)

# Cleantech Open

Last cheque observed Sep 2026; 165 cheques on record.

Deploying now Accelerator Website unconfirmed

Pre-seed Seed Series A Battery Sdg Recycling

Deploying now

**41%** of best year **17** **cheques in 12 months**, 165 on record

Since the last cheque **55** days **00** hrs **00** min **00** sec

Median round **$1.1M** Rounds led **0 of 165** Sole investor **30 rounds** Mostly in **United States, 87%**

Pitch Cleantech Open

## Cleantech Open highlights

- 01 17 cheques in the last 12 months
- 02 Mostly Venture and Grant: 60% of its rounds
- 03 Sole investor in 30 rounds, median $794K

## What they do

- **Type:** Accelerator (from a list, unverified)
- **Cheque size:** Not stated
- **Stages:** Pre-seed Seed Series A
- **Sectors:** Battery Sdg Recycling
- **Based in:** Los Angeles, United States
- **Cold pitches:** Accepted

A website was listed for this organisation, but we could not confirm it belongs to the firm that wrote these cheques. Either the site never mentions them, or it turned out to be a different company sharing the name. We show neither it nor anything read from it. [Tell us the right one](https://millionrounds.com/corrections?slug=cleantech-open).

## The record

Every round we can evidence, newest first **165 appearances**

- **2026** 14 rounds
- **Sept** **[Moon Five Technologies](https://millionrounds.com/company/moon-five-technologies)** Debt · US **$300K** With 2 others
- **Jul** **[Arculus Solutions](https://millionrounds.com/company/arculus-solutions)** Seed · US **$2.0M** With 2 others
- **Jun** **[Switch](https://millionrounds.com/company/switch)** Venture · US · TechStartups **$10M** With 4 others
- **Jun** **[Andluca](https://millionrounds.com/company/andluca)** Venture · US **Undisclosed** With 2 others
- **Jun** **[Kara Water](https://millionrounds.com/company/kara-water)** Crowdfunding · US **$794K** Sole investor
- **Apr** **[YouSolar](https://millionrounds.com/company/yousolar)** Crowdfunding · US **$443K** With 2 others
- **Apr** **[StorEn Technologies](https://millionrounds.com/company/storen-technologies)** Crowdfunding · US **$585K** With 1 other
- **Mar** **[Scalvy](https://millionrounds.com/company/scalvy)** Series A · US **$14M** With 1 other
- **Mar** **[Clean Valley Bio-filtration Technologies](https://millionrounds.com/company/clean-valley-bio-filtration-technologies)** Debt · CA **$4.0M** With 2 others
- **Mar** **[RePurpose Energy](https://millionrounds.com/company/repurpose-energy)** Crowdfunding · US **$268K** With 3 others
- **Mar** **[MicroEra Power](https://millionrounds.com/company/microera-power)** Grant · US **$25K** With 5 others
- **Feb** **[BlueTrace](https://millionrounds.com/company/bluetrace)** Seed · US **$1.3M** With 1 other
- **Feb** **[Sinergy Flow](https://millionrounds.com/company/sinergy-flow)** Seed · IT **$8.3M** With 2 others
- **Jan** **[Verde Technologies](https://millionrounds.com/company/verde-technologies)** Venture · US **$3.0M** With 1 other
- **2025** 25 rounds
- **Nov** **[Nativus](https://millionrounds.com/company/nativus)** US **$95K** With 1 other
- **Nov** **[Switched Source](https://millionrounds.com/company/switched-source)** Seed · US **$2.6M** With 2 others
- **Nov** **[Kara Water](https://millionrounds.com/company/kara-water)** Crowdfunding · US **$712K** Sole investor
- **Sept** **[MicroEra Power](https://millionrounds.com/company/microera-power)** Grant · US **$250K** With 4 others
- **Aug** **[RenewCO2](https://millionrounds.com/company/renewco2)** Seed · US **$2.0M** With 3 others
- **Aug** **[Enzinc](https://millionrounds.com/company/enzinc)** Venture · US **Undisclosed** With 1 other
- **Aug** **[RenewCO2](https://millionrounds.com/company/renewco2)** Seed · US **$4.2M** With 3 others
- **Aug** **[EarthEn](https://millionrounds.com/company/earthen)** Venture · US **Undisclosed** With 4 others
- **Aug** **[DTE Materials](https://millionrounds.com/company/dte-materials)** Venture · US **Undisclosed** With 1 other
- **Jun** **[ByFusion Global](https://millionrounds.com/company/byfusion-global)** Venture · US **Undisclosed** With 4 others
- **May** **[REplace](https://millionrounds.com/company/replace)** Seed · TechStartups **$2.1M** With 4 others
- **May** **[Leeta Materials](https://millionrounds.com/company/leeta-materials)** Seed · US **$5.6M** Sole investor
- **May** **[Flower Turbines](https://millionrounds.com/company/flower-turbines)** Crowdfunding · US **$1.3M** With 3 others
- **May** **[Kite Magnetics](https://millionrounds.com/company/kite-magnetics)** Seed · AU **$2.3M** With 2 others
- **May** **[Radical Plastics](https://millionrounds.com/company/radical-plastics)** Venture · US **$1.0M** With 3 others
- **May** **[Gencores](https://millionrounds.com/company/gencores)** Grant · US **$100K** With 4 others
- **Apr** **[GRAIN Ecosystem](https://millionrounds.com/company/grain-ecosystem)** Seed · US **$880K** With 1 other
- **Apr** **[Emulate Energy](https://millionrounds.com/company/emulate-energy)** Series A · SE **$5.5M** Sole investor
- **Apr** **[Moon Five Technologies](https://millionrounds.com/company/moon-five-technologies)** Grant · US **$3.4M** With 1 other
- **Mar** **[Capro-X](https://millionrounds.com/company/capro-x)** Venture · US **Undisclosed** With 2 others
- **Feb** **[Simusolar](https://millionrounds.com/company/simusolar)** Venture · US **Undisclosed** With 1 other
- **Feb** **[MESPAC](https://millionrounds.com/company/mespac)** Seed · IT **$1.5M** With 2 others
- **Feb** **[Ecotone Renewables](https://millionrounds.com/company/ecotone-renewables)** Crowdfunding · US **$208K** With 2 others
- **Jan** **[Linebird](https://millionrounds.com/company/linebird)** Venture · US **Undisclosed** With 2 others
- **Jan** **[Muon Vision](https://millionrounds.com/company/muon-vision)** Seed · US **$2.5M** With 2 others
- **2024** 40 rounds
- **Dec** **[Amatec](https://millionrounds.com/company/amatec)** Grant · US **$240K** With 3 others

An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.

## The team

We hold **2** people at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.

## The cheque

Pre-seed Seed Series A

Median round joined **$1.1M** the round, not its cheque Alone, median **$794K**

Led 0 of 165 rounds **0%**

- **Sole investor:** 30 rounds
- **Last cheque:** Sept 2026

Rounds by stage said on their site

- Venture *52*
- Grant *40*
- Seed said *31*
- Crowdfunding *12*
- Pre-seed said *9*
- Series A said *9*

Cheques by month Led Joined

Nov 2023 Oct 2026

Often in the room with

- [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) 36
- [US Department of Energy](https://millionrounds.com/fund/u-s-department-of-energy) 18
- [MassChallenge](https://millionrounds.com/fund/masschallenge) 13
- [Massachusetts Clean Energy Center](https://millionrounds.com/fund/massachusetts-clean-energy-center) 10
- [Third Derivative](https://millionrounds.com/fund/third-derivative) 10
- [Newchip Accelerator](https://millionrounds.com/fund/newchip-accelerator) 8

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## Who they invest alongside

The investors most often in the same rounds as Cleantech Open. A count of rooms they were both in, not a relationship either has claimed.

[**National Science Foundation** Government **36** rounds together](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno)[**US Department of Energy** Government **18** rounds together](https://millionrounds.com/fund/u-s-department-of-energy)[**MassChallenge** Accelerator **13** rounds together](https://millionrounds.com/fund/masschallenge)[**Massachusetts Clean Energy Center** VC firm **10** rounds together](https://millionrounds.com/fund/massachusetts-clean-energy-center)[**Third Derivative** Accelerator **10** rounds together](https://millionrounds.com/fund/third-derivative)[**Newchip Accelerator** Accelerator **8** rounds together](https://millionrounds.com/fund/newchip-accelerator)[**AcceliCITY powered by Leading Cities** Accelerator **7** rounds together](https://millionrounds.com/fund/accelicity-powered-by-leading-cities)[**Citibank** Growth equity **7** rounds together](https://millionrounds.com/fund/citi)[**MassVentures** VC firm **7** rounds together](https://millionrounds.com/fund/massventures)[**Techstars** VC firm **7** rounds together](https://millionrounds.com/fund/techstars)[**California Energy Commission** Government **5** rounds together](https://millionrounds.com/fund/california-energy)[**Luminate** Accelerator **4** rounds together](https://millionrounds.com/fund/luminate-accelerator)

## Recently backed

The latest companies Cleantech Open put money into.

[**Moon Five Technologies** $300K · Sept 2026](https://millionrounds.com/company/moon-five-technologies)[**Arculus Solutions** $2.0M · Jul 2026](https://millionrounds.com/company/arculus-solutions)[**Andluca** Jun 2026](https://millionrounds.com/company/andluca)[**Kara Water** $794K · Jun 2026](https://millionrounds.com/company/kara-water)[**Scalvy** $14M · Mar 2026](https://millionrounds.com/company/scalvy)[**Clean Valley Bio-filtration Technologies** $4.0M · Mar 2026](https://millionrounds.com/company/clean-valley-bio-filtration-technologies)

## Mentioned on podcasts

Episodes that name Cleantech Open in their description, not their title.

- [Inevitable](https://millionrounds.com/podcasts/inevitable) 10 Oct 2019 · 52 min Ep 44: Emily Reichert, CEO of Greentown Labs Mentions [Cleantech Open](https://millionrounds.com/fund/cleantech-open)[Flagship Ventures](https://millionrounds.com/fund/flagship-ventures) Apple PodcastsShow page

## Quick answers about Cleantech Open

### What does Cleantech Open invest in?

Cleantech Open invests most often at Venture and Grant (60% of the rounds on record), in sectors such as Battery, Sdg and Recycling.

### How active is Cleantech Open?

165 investments on record, 17 of them in the last 12 months. The most recent was in Sept 2026.

### What has Cleantech Open invested in recently?

Its most recent investments on record: Moon Five Technologies (Debt, Sept 2026), Arculus Solutions (Seed, Jul 2026) and Switch (Venture, Jun 2026).

### How big are Cleantech Open's cheques?

The median round it joins is $1.1M.

### Does Cleantech Open lead rounds?

Rarely, if at all: none of its 165 investments on record names it as the lead.

### Where does Cleantech Open invest?

Most of the companies it backs are in the United States (87%) and Italy (5%).

### Is Cleantech Open investing now?

Yes: it is actively investing, with 17 investments in the last 12 months.

### Who does Cleantech Open invest alongside?

Most often National Science Foundation (36 rounds together), US Department of Energy (18 rounds together) and MassChallenge (13 rounds together).

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