# Mainspring Energy funding rounds and investors

As of 14 Oct 2026, Mainspring Energy has raised $258M across 1 verified round on record; latest: $258 Million Series F led by General Catalyst, announced 14 Apr 2025.

Mainspring Energy sells linear generators for flexible, low-emissions power solutions to businesses across various industries.

Website: https://mainspringenergy.com  
Page: https://fireround.dev/companies/mainspringenergy.com

## Verified rounds

| Announced | Round | Amount | Lead investors | Other investors | Sources |
| --- | --- | --- | --- | --- | --- |
| 2025-04-14 | Series F | $258 Million | General Catalyst | Climate Pledge Fund, DCVC, M&G Investments, Marunouchi Innovation Partners, Pictet, Temasek | [mainspringenergy.com](https://www.mainspringenergy.com/news/mainspring-secures-258-million-in-financing-to-scale-linear-generator-business-adds-energy-and-tech-leaders-to-board), [prnewswire.com](https://www.prnewswire.com/news-releases/mainspring-secures-258-million-in-financing-to-scale-linear-generator-business-adds-energy-and-tech-leaders-to-board-302426971.html) |

Source: Fireround (https://fireround.dev), an open-source funding feed. Each round is checked against the pages listed with it.