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Mainspring Energy
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Developer of a linear generator technology capable of producing energy from a variety of fuels

Founded in 2010
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Company type Private Public ()
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Industry Group energy & power

Sector buildings

TRL Range 7-8
TRL 1 Basic research
TRL 2 Technology formulation
TRL 3 Applied research
TRL 4 Small scale prototype
TRL 5 Large scale prototype
TRL 6 Prototype system
TRL 7 Demonstration system
TRL 8 First of a kind commercial system
TRL 9 Full commercial application
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Headquarters Menlo Park, CA Menlo Park, United States
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Updated by Cleantech Group on 11/04/2024

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09/28/2022
Yolo County Yolo County
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Confirmed by Yolo County
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Date Investors Type Amount
04/14/2025 General Catalyst Partners General Catalyst Partners , Climate Pledge Fund Climate Pledge Fund , DCVC Data Collective DCVC Data Collective , Temasek Holdings Temasek Holdings , Marunouchi Innovation Partners Marunouchi Innovation Partners , M&G Investments M&G Investments , Pictet Group Pictet Group , Lightrock Lightrock , Khosla Ventures Khosla Ventures , Gates Frontier Gates Frontier (10)
Post-money valuation of
Mainspring raises Series F financing round to advance energy solutions that can provide dispatchable power in various increments and support applications in data centers, buildings, microgrids, EV charging and others.
Growth Equity $258,000,000
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