ExoTerra’s Courier is a 12U Solar Electric Propulsion Module delivering up to 1270 m/s to a 12U CubeSat. Courier begins with ExoTerra’s Halo Hall Effect Thruster which operates between 85-175W and packages within 1/4U, enabling it to operate within a CubeSat form factor. Courier is powered by ExoTerra’s high specific power Fold Out Solar Arrays (FOSA). The arrays generate 296 W at BOL and mount to a single axis gimble to increase orbit average power. Our unique 100kRad radiation tolerant Electric Power System bridges the power and propulsion with a lightweight, high efficiency power distribution and power processing unit. The system efficiently and reliably delivers the power to components throughout the spacecraft.