Mainspring Energy

Mainspring Energy designs and manufactures the Mainspring Linear Generator, a fuel-flexible power generation technology that delivers clean, dispatchable onsite power. Founded in 2010 by Stanford engineers, the company serves utilities, data center developers, Fortune 500 companies, enterprise and industrial customers seeking lower-emission generation at the point of use.

The Linear Generator works through a flameless, low-temperature reaction that produces ultra-low emissions and reaches 46% efficiency. It runs on biogas, hydrogen, natural gas and propane, allowing customers to shift toward zero-carbon fuels without replacing the equipment. Systems scale from hundreds of kilowatts to hundreds of megawatts, and the company reports more than 450 megawatts across field operations and late-stage development projects.

The underlying technical work spans linear generator technology, flameless low-temperature combustion and fuel-flexible energy systems, positioning the product as a distributed energy resource for sectors including data centres, utilities and heavy industry. The company states a mission-driven focus on lowering emissions and enabling the transition to zero-carbon fuels.