PV canopies will have more of an upfront cost (that can often be offset with government incentives), but is a great way to install renewable energy onsite, contributing to EAc2: Onsite Renewable Power, without losing the functionality of your parking.
Shading using Photovoltatic (PV) panels is a great way to contribute to this credit, but the PV panels have the potential to create a lot of glare. Be sure to orient the PV panels in a way that does not affect building occupants or drivers (while still making sense from the perspective of exposure to the sun to generate electricity).
Canopies, terraces, balconies, and other architectural devices are covered by the calculations for this credit if they do not have conditioned space below them. Coverings that have conditioned space below are considered roofs and are covered under SSc7.2: Heat Island Effect—Roof.
