Nature has been part of the Wiesen festival philosophy from the start. Rainwater tank (54,000 l under the toilets, 1997) for flushing and irrigation with timers and soil-moisture sensors. 10 kWp PV on the green gastronomy roof (since 2013); vacuum-tube solar thermal (12 kW) for hot water in kitchen, laundry, basins, showers and cup washer. Lighting ~90% LED, same control system. About 1,500 m² green roofs for insects, cooling and noise. Reusable cups with on-site washer and deposit; returnable crates, kegs, concentrates mixed on site, soda produced on site; compostable or recycled plates. Four former ÖBB carriages as artist dressing rooms (upcycling since the 1980s). CO₂ calculator EE Music IG Tools for energy, water, waste and visitor travel.
