Solestial Inc., a Tempe, Arizona–based solar technology company specializing in photovoltaic systems for space applications, has signed a sales agreement with EnduroSat AD, a Sofia, Bulgaria–based manufacturer of small satellites. According to Solestial, the agreement is for the supply of radiation-hardened silicon solar modules for EnduroSat’s next-generation ESPA-class FRAME satellite. The modules are designed to self-cure radiation damage under sunlight at temperatures as low as 65 °C while maintaining long-term efficiency. Solestial has stated that the modules are engineered to operate for up to ten years in orbit and are produced using automated, cost-efficient manufacturing processes. EnduroSat has announced plans to scale production at its new facility to 60 satellites per month from mid-2026. The contract also includes an additional 7 kW option for future satellite missions. Both Solestial and EnduroSat have emphasized that the collaboration is a significant advancement in durable and affordable satellite power solutions. Prior to this partnership, Solestial had secured a $1.2 million SpaceWERX grant to advance automated assembly of 1 kW solar wings for satellite applications.