translucent solar foils power off-grid lighting installation Main Light by ttal is a self-sufficient lighting installation developed along the Main riverfront in Frankfurt, Germany , by Munich-based studio ttal in collaboration with Italian lighting manufacturer ewo. Presented as part of the World Design Capital 2026 initiative, the project explores how renewable energy infrastructure can become an integrated and visible component of public space through autonomous solar -powered lighting systems. The installation introduces a new generation of off-grid streetlights that generate renewable energy directly at the point of use through translucent organic photovoltaic (OPV) solar foils. Developed in response to increasing urban energy demands, light pollution, and the environmental impact of conventional public lighting systems, the project rethinks street infrastructure through the concept of ‘prosumers,’ systems that both consume and produce energy.…