Australia has managed to do it. Installers are tripping over each other to put solar on roofs here.
> How does that incentivize power companies, who are allowed to operate monopolies, to invest in clean energy infrastructure?
Arbitrage. If every house has solar and battery, that's a huge load off the grid, but there's still apartments, businesses, and industry that need power, especially at night. Grid-scale batteries take the excess from households, and distribute to those that need power. There would still be need for grid-scale renewable generation, just hopefully not built on existing nature reserves.
This is why I'd rather a rule like "you must have enough solar to cover your aircon power over a hot summer" and then gridscale the rest.
Instead, I too will enjoy my almost-aristocratic landowner status and will be upgrading my solar setup in the near future.
I think rooftop solar is also excellent, but only in theory. In practice, I feel like rooftop solar allows public utilities to abdicate their responsibility. It diminishes the affect of collective pressure on major energy producers to hold up their end of the bargain to invest in clean energy because it shifts costs to homeowners and effectively makes them a very weak competitor to big energy producers. A power grid full of smart systems and robust transmission lines is an amazing resource - but it is very capital intensive. How do we replace that with rooftop solar that many homeowners seek loans to install? How does that incentivize power companies, who are allowed to operate monopolies, to invest in clean energy infrastructure?