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Mainspring Energy

305 employees

Mainspring Energy is engineering advanced technology by developing a prototype of a linear generator that converts fuel to electricity.

Basic info

Industry

renewable energy semiconductor manufacturing

Sectors

Energy
Clean Energy
Oil and Gas

Date founded

2010

Funding rounds raised

Total raised

$150M

from 18 investors over 18 rounds

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Mainspring Energy raised undisclosed on April 17, 2023

Investors: Bloomberg New Energy Finance

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Mainspring Energy raised $140M on September 22, 2022

Investors: Trog Hawley Capital LLC, Khosla Ventures, Princeville Capital and Hanwha Systems

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Mainspring Energy raised $150M on May 24, 2022

Investors: Khosla Ventures, Princeville Capital and Fine Structure Ventures

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Mainspring Energy raised $95M on May 4, 2021

Investors: Trog Hawley Capital LLC, ClearSky, Khosla Ventures, Princeville Capital, Equinor and American Electric Power

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Mainspring Energy raised $83M on January 24, 2018

Investors: Equinor, Khosla Ventures and American Electric Power

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Mainspring Energy raised undisclosed on January 1, 2010

Investors: Khosla Ventures

FAQ