The main problem is cost effectiveness. If it costs twice as much per unit of power for a building-level installation vs utility-level, then it's a hard sell. C

The main problem is cost effectiveness. If it costs twice as much per unit of power for a building-level installation vs utility-level, then it's a hard sell. Cheaper to just buy utility-grade power from the grid. It's also a question of retrofit vs new construction. Building it right into a new building is definitely going to be cheaper than adding it to an existing building. What I expect to see more of is solar panels in parking lots. Easy to build over, and lots of otherwise wasted space. Plus you're getting power during business hours.