# H2SITE funding: rounds and investors > H2SITE has raised $3.9M across 2 rounds since 2025. Investors include EIC Accelerator, Breakthrough Energy and MassMutual Ventures. Every round with its source. Source: https://millionrounds.com/company/h2site (Millionrounds; every figure on the page links to its filing or article) Spain · [Funded startup](https://millionrounds.com/companies) # Who invested in *H2SITE* 2 rounds we have observed, with the 3 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it. Energy Raised 2 months ago Funding summary Updated 26 Oct 2026 **$3.9M** raised across 2 rounds since 2025, from 2 sources - **Latest round:** Grant, $3.9M Sept 2026 - **Investors:** 3 See who backed them ## The funding story Each circle is a round, placed by date and sized by amount. The line above is the running total. 2026 **?** Venture **$3.9M** Grant - **First round:** Venture - **Biggest round:** $3.9M - **Between rounds:** 14 months ## The rounds - **Sept 2026** Grant **$3.9M** *3 returning* [EIC Accelerator](https://millionrounds.com/fund/eic-accelerator) [Breakthrough Energy](https://millionrounds.com/fund/breakthrough-energy) [MassMutual Ventures](https://millionrounds.com/fund/massmutual-ventures) Source recorded - **Jul 2025** Venture **Amount undisclosed** *3 new* [EIC Accelerator](https://millionrounds.com/fund/eic-accelerator) [Breakthrough Energy](https://millionrounds.com/fund/breakthrough-energy) [MassMutual Ventures](https://millionrounds.com/fund/massmutual-ventures) Source recorded ## Founders and team From H2SITE's own website: 10 on the team. - **Andrés Galnares** Chief Executive Officer - **Javier Cavada** Head of the Board - **Mitsubishi Power** Head of the Board - **Allegra Kowalewsky-Ferreira** Partner - **Gaëtan Bonhomme** Partner - **Gorka Hermoso** Financial Director - **Johann Boukhors** Managing Director - **Jon Meléndez** Technical Director - **Jose Antonio Medrano** Technical Director - **Kjersti Reinsnos** Managing Director ## Who was in which round The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led. **Venture** 2025 **Grant** 2026 [EIC Accelerator](https://millionrounds.com/fund/eic-accelerator) [Breakthrough Energy](https://millionrounds.com/fund/breakthrough-energy) [MassMutual Ventures](https://millionrounds.com/fund/massmutual-ventures) ## Everyone who backed them [EIC Accelerator](https://millionrounds.com/fund/eic-accelerator) Government **2** rounds [Breakthrough Energy](https://millionrounds.com/fund/breakthrough-energy) VC firm **2** rounds [MassMutual Ventures](https://millionrounds.com/fund/massmutual-ventures) VC firm **2** rounds Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=h2site). ## Also claim to have backed them These 2 firms list H2SITE as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above. [Calderion](https://millionrounds.com/fund/calderion) VC firm Per its own site [Engie New Ventures](https://millionrounds.com/fund/engie-new-ventures) Corporate VC Per its own site ## Quick answers about H2SITE ### Who invested in H2SITE? H2SITE's investors include EIC Accelerator, Breakthrough Energy and MassMutual Ventures. ### How much has H2SITE raised? H2SITE has raised $3.9M across 2 rounds since 2025. One round did not disclose an amount, so the total is a floor. ### When did H2SITE last raise? H2SITE's most recent round was a Grant of $3.9M in Sept 2026. ### What was H2SITE's biggest round? Its most recent round, $3.9M in Sept 2026, is also its largest on record. ### Who backed H2SITE first? H2SITE's first round on record, in Jul 2025, was backed by EIC Accelerator, Breakthrough Energy and MassMutual Ventures. ### What stage is H2SITE at? H2SITE's latest named round is a Grant, in Sept 2026. ### Where is H2SITE based? H2SITE is based in Spain. ## Companies like H2SITE In the same sector, and raised in the last eighteen months. [**HelmX Co.** $150K · Aug 2026](https://millionrounds.com/company/helmx-co)[**Energiot** $1.7M · Jun 2026](https://millionrounds.com/company/energiot)[**XFuel** $41M · May 2026](https://millionrounds.com/company/xfuel)[**IONLY** $1.4M · Mar 2026](https://millionrounds.com/company/ionly)[**COX Group** $2.6B · Jan 2026](https://millionrounds.com/company/cox-group)[**Clevergy** $3.7M · Oct 2025](https://millionrounds.com/company/clevergy) ## Find investors like these Search every investor by what they have actually funded, then narrow to your stage and market. Free. Open the investor searchOr these rounds in the app