Also you can easily put solar over e.g. car parks, in which case you don't even need a proper roof if you funnel water from the panels towards the gutters witho

Also you can easily put solar over e.g. car parks, in which case you don't even need a proper roof if you funnel water from the panels towards the gutters without splashing the users walking to the cars. The cost should be within 30% of the panel price itself for a decent-size parking lot, less if you can get economies of scale through standardized modules that are placed next to each other to form rows for the cars. A bonus would be that the cars don't heat up as much/get packed with snow. And the land isn't wasted, because there is no reason not to have a roof over a paved parking lot other than the fact that a roof costs money to build and maintain, which isn't an issue with solar. You already can't use the land for plants/nature, so you might as well put your solar there instead of some open field/grassland that can be used for something else.