Bullish
$FCEL | FuelCell Energy is developing a Hybrid Solid Oxide Fuel Cell (SOFC)-Battery Energy System for Large Displacement Unmanned Undersea Vehicle (LDUUV) propulsion as part of the Office of Naval Research's LDUUV Innovative Naval Prototype (INP) Energy Program. The project objective is the development of an air-independent refuelable power system with high energy density suitable for long duration underwater missions. https://iopscience.iop.org/article/10.1149/05601.0023ecst/pdf
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