The solar covered parking lots near me are great because they also serve as cover for your car when it’s hot and sunny.

It’s not the most cost effective way to install solar, though. A tall structure designed to put the panels high up in the air and leave a lot of space for cars is a lot more expensive than normal rooftop solar or even field setups. This is basically a way to force some of the cost of clean energy as a tax on parking lots. Which may not be a bad thing for dense cities where parking lots have their own externalities on the limited available land.

It's probably less expensive than field setups in large part due to siting near existing infrastructure. And it doesn't have to out compete residential, it just has to be a net positive investment on its own terms, out competing an otherwise unshaded parking lot that isn't leveraging it's airspace for anything.

Rather than a tax on lots it's something that turns them into a source of revenue generation.

A better version for shade and city beautification is to force trees around/within the parking lot.

I wonder if this will make it preferable to build parking structures rather than parking lots.

> The solar covered parking lots near me are great because they also serve as cover for your car when it’s hot and sunny.

I would like someone better at maths than I am to work out how much petrol this saves drivers because you're getting into a car that's been parked in the shade and not running the air conditioning so hard.

I bet it's at least detectable, even if it's not much.

There's a lot of entirely unsupported statements here that seem to be nothing more than uneducated opinion.

You assume there's still a lot of rooftop space that doesn't already have solar on it. SK has very high population density and long started moving toward "less efficient" installs like balcony solar because most 'easy' rooftops already have solar on them. Remember: the rest of the world is way ahead of the US on this stuff. The UK for example regularly sees nearly 100% renewable powering of their grid plus 'recharging' their pumped hydro and BSS reserves.

You declare that covered parking solar is more expensive than rooftop, with no supporting evidence whatsoever. Rooftop solar involves a great deal of site-specific design work, and a ton of on-site, dangerous labor, and usually has to meet tighter code standards. Rooftop work is some of the most dangerous work one can do; that makes it more expensive labor but also injuries and deaths have a substantial cost to society. And labor has to be more skilled.

Parking lot solar setups can be almost entirely assembled in factories, highly standardized down to just about the ground. That reduces parts, eases supply chains, sales inventory, repairs, etc. Final bolt-together and wiring connections are fast, easy, and don't require skilled labor. "Bolt this stuff together, plug this into this." Used or partially damaged systems and their components can be easily repaired or reused elsewhere.

Parking lot solar encompasses a LOT of panels which is more efficient as fixed costs are spread out more; rooftop solar is generally less-so because it's smaller and as mentioned involves a lot of site-specific work.

You ignore the energy savings from the cars being much cooler and not needing to waste as much energy. Being shaded also means the paint, trim, interior, etc stay in better condition longer.

You ignore that solar on-site coupled with EV chargers on site eliminates a lot of grid transmission losses. In theory a residential complex, employer, retail, or commercial site could set up something like this, pumping most of the energy into the cars parked underneath, and have a fairly small connection to the grid.

Bifacial panels suspended well over the ground can collect a not-insignificant amount of energy from their underside.

Solar panels suspended where they have lots of airflow over and under them run cooler, and produce more electricity.

You don't seem very well informed on the subject and probably shouldn't be commenting so confidently.