This article by REN21, a renewable energy policy think tank, was published in May 2021. The article provides insight to the progress that has made over the last 20 years and that current challenges and opportunities in relation to future progress. City governments in more than 830 cities in 72 countries had set renewable energy targets in at least one sector (power, heating and cooling, and/or transport), the analysis shows. Over 610 of these cities had set 100% renewable energy targets.
Keywords: Intelligent Building, Communications, Energy Management, Research & Development, Association, Smart Cities