In a first, US nuclear fusion firm adds fission tech using 10MW underground microreactors

Zap Energy will add a Japanese-designed 10MW fast-neutron microreactor to its fusion platform.

The sealed underground fission reactor is meant to generate earlier revenue and serve data center customers.

The strategy is intended to bridge the gap until fusion becomes commercial.

The move reflects growing startup interest in compact nuclear power as AI-driven electricity demand surges.