Mainspring, a Menlo Park, CA-based linear generator products company, raised $258M in Series F funding.
The round was led by General Catalyst, with participation from Amazon’s Climate Pledge Fund, DCVC, Temasek, Marunouchi Innovation Partners, M&G Investments, Pictet Group, and earlier investors including Lightrock and LGT Bank, Khosla Ventures, and Gates Frontier, among others.
The company intends to use the funds to expand its linear generator power business and operations as it grows in both manufacturing and customer sales.
Led by CEO and Founder Shannon Miller, Mainspring designs and manufactures a solution, the Linear Generator, that delivers advantages in cost, reliability, and flexibility, including the ability to dynamically switch among fuels. The product is scalable from a single unit to a grid-level array, delivering from 250 kW to 100+ MW of power in any increment needed.
The company also has added two Board members: Tom Linebarger and Bethany Mayer.
FinSMEs
15/04/2025