In the recent past, there has been a surge in the activity of building construction, particularly in the conclave or block mode and some even giving shape to a sort of mini-city with almost all types of amenities and certain facilities that are needed in modern day living. However, with voluminous activities in this field, there is now a ‘specific demand’ for ‘Smart Cities’ with a considerable portion of business activities that further requires more energy than that need for modern housing alone. Ultimately, the core issue is “energy”, more particularly “clean” or “renewable” energy. This is the subject matter of this article, where a brief review is given on solar power industry that must be considered for building ‘Smart Cities’.