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Mainspring Energy

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Markets
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Mainspring Energy designs and manufactures a new category of power generation equipment called the Mainspring Linear Generator. It is a fuel-flexible power source that runs on biogas, renewable hydrogen, and other fuels.
Investment Focus
Technologies
Biogas2
Energy Storage1
Geography
USA2
United States1
Deal History (3)
California Bioenergy purchases Mainspring Linear Generators
Seller Biogas USA Feb 23, 2026
CalBio expands linear generator capacity with Mainspring Energy
supplier Biogas USA Feb 24, 2026
Jane Street participates in $35 million Series B funding for energy storage company Mainspring Energy
Developer Energy Storage United States Sep 28, 2025 USD95M
Co-Investors & Partners
California Bioenergy
2 shared deals
Jane Street
1 shared deal
Lightrock
1 shared deal
Bill Gates
1 shared deal
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