Portal Space Systems

Portal Space Systems manufactures the Supernova spacecraft bus, a payload-agnostic platform engineered for high-maneuverability orbital operations and rapid in-space transportation. The vehicle integrates a proprietary solar-thermal propulsion system that heats storable propellant to generate thrust, delivering approximately six kilometers per second of delta-v capability. This architecture enables transfers from low Earth orbit to geostationary orbit in hours and to cislunar space in days, while supporting collision avoidance maneuvers, multi-orbit operations, and on-orbit refueling to extend mission duration. The platform accommodates payloads up to 500 kilograms and is designed for a minimum five-year operational lifespan. Portal operates manufacturing facilities in Bothell, Washington, with a second production facility established in 2025 to scale output.

Portal Space Systems serves commercial satellite operators and U.S. government customers including the Department of Defense and Space Force, addressing requirements for tactically responsive space operations, asset repositioning, and space domain awareness. The company was founded in 2021 by Jeff Thornburg, a propulsion engineer with prior leadership roles at SpaceX and Amazon Kuiper. Portal has secured over three million dollars in contracts via the Space Force and Department of Defense, including a Direct-to-Phase II Small Business Innovation Research award focused on tactically responsive space capabilities. The company completed critical design review and full-scale thruster testing in 2025, with initial flight demonstration scheduled for mid-2026.