Mainspring has raised $258 million in Series F funding to enhance its linear generator power business. The round was led by General Catalyst with participation from multiple investors including Amazon’s Climate Pledge Fund.

Mainspring, based in Menlo Park, CA, has secured $258 million in Series F financing. This round was led by General Catalyst and included participation from various investors, such as Amazon’s Climate Pledge Fund and DCVC. The funds will be used to expand its manufacturing and sales operations in the linear generator power market. The company designs and manufactures scalable solutions aimed at improving cost, reliability, and flexibility.