If only there were a way for every home and business to generate electricity locally as a sort of decentralized power grid, like by putting some sort of low-carbon powerplant on their roof.
How is that going to help heat my house in my cold snowy Winters?
And then what if we built it bigger for better economy of scale by hooking up all the generators and all the consumers in an area together? We could share different methods of generation! Maybe someone has a hydro generator instead of completely relying on solar that stops working when it gets dark. We could have a bigger, more efficient gas generator instead of multiple smaller individual gas generators.
Sure. I can do that now. The math works out so that I'll break even on the expense in 25 years even when I include government incentives... right about the end of life for the solar cells. If I lived closer to the equator, my break even point would be sooner, but right now for many people it's a huge up-front outlay for zero benefit.