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Indoor skydiving wind tunnels are highly energy-intensive installations, yet their environmental performance remains largely unexamined. This study develops a mathematical model to evaluate how on-site photovoltaics, battery storage, and potential regenerative braking can reduce the electricity cost and carbon footprint of a horizontal wind tunnel designed by Storm Adventures. The model integrates empirically measured fan-motor demand, long-term solar irradiance data for Liepaja, Latvia, and Monte Carlo simulation...