 Ion thrusters are an enabling technology for SSP Low Earth Orbit (LEO) to Geostationary Orbit (GEO) orbit transfer and station keeping.Studies showed that advanced electric propulsion can provide a factor of 5 increase in payload for Earth to orbit transfer when compared to storable biprop and cryogenic biprop thrusters; payload mass that normally would be manifested for propellant.Comparisons made to gridded ion thrusters, magnetoplasmadynamic and pulsed inductive thrusters showed that Hall thruster technology provides overall greater benefits, including quicker trip times, good power density, a good contemporary technology base and good flight history, all translating into commercial industry acceptance.