Trees vs solar power

This photo, of some solar panels, was taken along the waterfront in Bicentennial Park, Homebush. The solar panels in question are now totally shaded by trees.

I went past this spot about 6 months ago, and there was a ute full of workmen there with a chainsaw, arguing with someone - presumably over what could and could not be lopped. I guess the chainsaw lost out.

I take it that these panels are used to power some navigation equipment for boats plying the river (which is right on the other side of those trees). What's going to happen if the navigation stuff runs out of power one night, and there is a prang on the water, and someone dies? Are we putting trees before people to that extent?