mainspringenergy
Manufactures fuel-flexible linear generators for onsite power generation.
Company facts
- Founded
- 2010
- Employees
- 523
- Headquarters
- United States
- CEO
- Shannon Miller
- Type
- Private
- Funding
- Series F · $258M · 2025
About
Mainspring Energy, founded in 2010 by a team of Stanford engineers, is a pioneering clean energy generation company based in Menlo Park, California. With a mission to accelerate the transition toward an affordable, reliable, net-zero carbon grid, Mainspring has developed the Linear Generator, a novel technology providing clean, dispatchable, fuel-flexible power generation. This innovation allows for localized power solutions that cater to varying energy needs while utilizing cleaner fuel sources. The core of Mainspring’s technology lies in its ability to convert fuel to electricity with minimal emissions. This is achieved through a highly efficient design that features direct conversion of linear motion into electricity, maximizing energy extraction while minimizing mechanical losses. The generators are capable of operating across a broad spectrum of fuel types and can dynamically adjust their output in response to changing energy demands, making them suitable for various applications—from industrial plants to renewable microgrids.