Zap Energy, a pioneer in fusion energy technology, has raised $27.5 million in Series B funding. The round was led by Addition, with participation from Energy Impact Partners, GA Capital and Fourth Realm, as well as existing investors Chevron Technology Ventures and LowerCarbon Capital.

Zap Energy is a Seattle-based start-up company developing a next-generation modular nuclear reactor with an innovative approach to advancing cost-effective, flexible, and commercially scalable fusion.