The overall objective of this project is to carry on with the work done during the past 8 years for the sustainability of the activities of the European advance solar laboratories involved in SFERA and SFERA 2nd phase, and extend these activities to the new solar laboratories which will bring added value to this European Research Infrastructure for Concentrating Solar Power. The specific goal is to contribute to ensure the long-term sustainability of these European advance solar laboratories, supporting Europe as a global leader in solar research infrastructures. Those activities will include (i) networking activities to further develop the cooperation between the research infrastructures, the scientific community, industries and other stakeholders; (ii) transnational access activities aiming at providing access to all European researchers from both academia and industry to singular scientific and technological solar research infrastructures; and (iii) joint research activities whose sole purpose is to improve the integrated services provided by the infrastructure. Deadline is on 31st January 2023.