Six energy companies backed by Bill Gates and Breakthrough Energy
Mainspring Energy co-founders (L-R) Adam Simpson, Matt Svrcek, and Shannon Miller with the company’s linear generator.Photo: Mainspring Energy In January 2018, Gates invested in Mainspring Energy’s $83.3 million Series C, according to PitchBook, which led the company to a $208.3 million valuation. Mainspring’s linear generator uses chemical energy to convert motion along a linear line…
