What are the innovative concepts, solutions and technologies that can make rooftop solar power plants far more widespread?

Distributed rooftop solar power plants offer a sustainable energy avenue with significant potential to contribute to clean energy generation. However, due to technical, operational and sometimes policy constraints, the pace of growth of rooftop and on-premises solar power plants has been less than its potential. What innovations can help overcome the present challenges faced by rooftop solar power plants and take it to the next level of deployment?