It is a clean and renewable source of energy but it is still heavy and expensive to implement. As technology evolves, alternative components have made solar powered panels more affordable but they are still expensive and that limits its uses. Developing countries would be favoured with solar power usage but it is still a long way until it is affordable.
It is usage has been in large scale by the industry and governments in an attempt to substitute fossil fuel and the hard business that is to supply electrics to growing populations. Houses built with solar panels can generate almost all energy it consumes. The only point been that sun is needed to supply energy, and it is not always the case. Many eco friendly buildings are constructed with this in mind and a combination of energy sources may be required to keep the electrics going and the household running.