During this Phase I effort ESAero will draw upon its knowledge of hybrid-electric propulsion system design and analysis for fixed wing aircraft to investigate the potential benefits of incorporating such systems into rotorcraft designs. Past rotorcraft studies have been conducted in conjunction with Electricore, Inc. and an industry prime, to develop hybrid propulsion system trade studies and develop databases for hybrid propulsion system worthy components. This knowledge will be leveraged to investigate potential areas of improvement including energy consumption, weight, overall efficiency, and safety. Implementing hybrid-electric systems could potentially remove redundant systems, reduce turbine size and allow for electrically powered emergency decent. In addition, decoupled energy management has shown potential benefits for fixed wing aircraft, allowing propulsors to be placed virtually anywhere around the aircraft. The potential benefit specific to rotorcraft may mean a broadening of configuration possibilities.