Mainspring Energy
Mainspring Energy is a Distributed Generation company founded in 2010 and based in Menlo Park, USA. It has raised $726.3M in total funding, most recently a Series F in 2025.
Mainspring Energy builds linear generator systems that convert natural gas and renewable fuels into electricity with low emissions. $500M+ raised; commercial deployments underway; linear generator architecture enables multi-fuel capability.
Bill Gates-backed distributed generation technology offering fuel-flexible, efficient on-site power for data centers and commercial buildings.
mainspringenergy.com ↗·Distributed Generation·USA·private 
