Land isn't such a scarce resource when you get outside the city. A centralized solar farm is cheaper to install and easier to maintain than installing on roofs

Land isn't such a scarce resource when you get outside the city. A centralized solar farm is cheaper to install and easier to maintain than installing on roofs and parking lots. If people want solar on their roofs or in their parking lots, then by all means they should install it, but if your goal is to deliver the cheapest cost per killowatt-hour, then finding some vacant land away from people and putting up a lot of panels is a good plan.