This research project explored solar energies beyond their traditional role as a mere power source, examining their capacity as agential materials (Barad, 2007; Bennett, 2020) within smart textile design. It emphasized the active participation of solar energies—encompassing visible light, ultraviolet (UV) wavelengths, and infrared wavelengths—in shaping both the material properties and interactive behaviours of textiles. These energies are framed as co-constituents in the dynamic interaction between natural and designed environments, influenced by a “more-than-human design” theoretical framework (Barzdzell et al. 2021; Giaccardi et al. 2025; Wakkary 2021).