Mainspring's Energy Transition Plan Backed by $258M Investment
Deal News | Apr 14, 2025 | General Catalyst Partners LLC
General Catalyst Partners LLC has led a $258 million Series F investment in Mainspring Energy. Mainspring, led by co-founder and CEO Shannon Miller, has developed a high-efficiency, non-combustion linear generator that can run on both conventional and clean fuel sources. The investment was bolstered by prominent energy investors like Amazon's Climate Pledge Fund, DCVC, Temasek, and others. With growing energy demands and lengthy infrastructure projects, Mainspring offers a versatile solution with its software-defined generator. This investment aims to expand Mainspring's production capacity and scale its commercial impact across data centers, EV microgrids, commercial and industrial sectors, and utilities. Tom Linebarger, the former Chairman and CEO of Cummins, is joining Mainspring's Board to support their expansion and technical navigation.
Sectors
- Energy
- Private Equity & Venture Capital
Geography
- United States – Mainspring Energy and General Catalyst, along with the energy challenge context, are based in the United States.
Industry
- Energy – The article focuses on the energy sector, discussing innovations in energy technology and investments in sustainable solutions.
- Private Equity & Venture Capital – General Catalyst's investment in Mainspring Energy highlights activity in the venture capital space, driving growth in innovative energy solutions.
Financials
- $258 million – Series F funding round led by General Catalyst for Mainspring Energy.
Participants
| Name | Role | Type | Description |
|---|---|---|---|
| Mainspring Energy | Target | Company | A company developing a versatile, high-efficiency linear generator that can leverage both conventional and clean fuels. |
| General Catalyst Partners LLC | Investor | Company | A prominent venture capital firm leading the $258 million investment in Mainspring Energy. |
| Amazon's Climate Pledge Fund | Investor | Company | Amazon's investment arm focusing on sustainable technologies, joining the funding round. |
| DCVC | Investor | Company | A leading venture capital firm investing in disruptive technologies. |
| Temasek | Investor | Company | A global investment company with a focus on sustainable, long-term growth investments. |
| Khosla Ventures | Investor | Company | A venture capital firm focusing on impactful companies, particularly in energy and sustainability. |
| Shannon Miller | CEO | Person | Co-founder and CEO of Mainspring Energy. |
| Tom Linebarger | Board Member | Person | Former Chairman and CEO of Cummins, joining Mainspring's Board of Directors. |