Portal Space is developing a new Solar Thermal Propulsion system for satellites, theoretically giving them much greater delta-V cpability.
Ars article: New space company seeks to solve orbital mobility with high delta-v spacecraft
Run by the guy who headed up Raptor design for SpaceX.
Ars article: New space company seeks to solve orbital mobility with high delta-v spacecraft
Run by the guy who headed up Raptor design for SpaceX.