Not just solar..this kind can power your homes 365 days throughout your life with just the waste you are making.
Going off grid means creating own energy instead of ploughing the coal beneath us. Smart cities shouldn't just look over for renewable energy and simply installing solar energy isn't a solution for everything. By trying to invent better energy cycles we can not only create energy required for our daily needs but also could generate power to the grid that can actually pay our other bills.
Here is my research in energy. I made a collection of such methodologies exclusively for smart cities.