In the third installment of the Sister City Challenges series, leaders from Aspen and Queenstown came together to tackle two of the toughest infrastructure issues facing these mountain resort towns: energy and transport. Moderated by Christine Maiden Sharp, the conversation revealed just how tightly these systems are now linked - and how innovative thinking, community engagement, and international knowledge exchange can deliver resilient, affordable solutions. While local in detail, the lessons shared apply to any community navigating growth, climate pressure, and the need to build with people at the centre.