PV doesn't require much copper, either. Maybe for front contact wires, if silver gets too expensive? But if it can afford to use silver now, copper won't be a huge ask (basically just need to deposit a barrier layer to keep the copper from reacting with the silicon.)

The cables connecting PV to the grid, as well as the grid itself, can all use aluminum conductors. Even large transformers can be designed with aluminum if copper gets too expensive.