Our robots and the base station are powered with renewable energy to promote sustainability. Depending on the geographic region, the base station is equipped with photovoltaic solar cells or wind turbines. Using solar power, the robots recharge their batteries during the day at the base station, and activate at night. If necessary, the robots can activate during the day on a partial charge. Using wind power, the base station is equipped with its own batteries to store energy from variable winds, and the robots recharge when necessary.