Mainspring Energy

Energy · Menlo Park, US · mainspringenergy.com

Linear generator technology for onsite zero-carbon power

Founders

Shannon Miller (United States · ♀) — While earning her Stanford mechanical-engineering PhD researching efficient fuel-to-electricity conversion, she co-founded Mainspring (originally EtaGen) in 2010 to commercialize the linear generator and serves as CEO.
Matt Svrcek (United States · ♂) — A Stanford graduate fellow researching fuel efficiency and emissions, he co-founded Mainspring with Shannon Miller in 2010 and serves as CTO, designing the early linear-generator prototype.
Adam Simpson (United States · ♂) — A Stanford Advanced Energy Systems Lab researcher who developed the linear-generator concept alongside Miller and Svrcek, co-founding Mainspring in 2010 as chief commercial officer.

Date	Round	Amount
May 2022	Series D Plus Mainspring Energy, a California onsite power generation company, raised over $150M in the first stage of its Series E led by Lightrock, with Khosla Ventures and Bill Gates participating.	$150M

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