Can someone provide a bit more details about this. Is this only if you have a massive solar farm (which I assume is cheaper due to land value + large quantities) or does it also include solar for residential (which I assume is more expensive due to installation, limited area, etc)?

When looking at a satellite image of LA, I wonder how much power we could generate by having panels installed on the flat/near-flat rooftops of apartment buildings, at least in the sunnier parts of the city.