In the first edition of this book, we wrote about a group of cities showing how to experiment with solar energy and wind power. They were proudly and bravely stepping into a largely unknown world, passionate about starting a journey that had to be embarked on no matter what it cost. These included Masdar City in the United Arab Emirates; Freiburg and Kronsberg in Germany; Malmö in Sweden; Perth, Adelaide, Melbourne, and Sydney in Australia; Cape Town in South Africa; Daegu in South Korea; Barcelona in Spain; London in the United Kingdom; Toronto in Canada; and Seattle, Chicago, San Francisco, Sacramento, Austin, Atlanta, and Honolulu in the United States. Today most of these cities are ramping up their commitments and countless others are joining them, as doing so is no longer an economic burden but an economic necessity. This chapter is about the rise of renewable energy and how it is providing new opportunities for resilient cities.