Uh, this is going to be an array of photovoltaic panels as far as I understand it from the permits we've seen. The reflectivity of PV panels is actually quite low as their sole intent is to absorb as much sunlight as possible. See this handy table:
You may be thinking of solar thermal facility which is comprised of a bunch of reflective panels focused on a central tube to super-heat water to create steam and turn a turbine like a typical power generation facility. Two totally different applications.
I doubt there's going to be any glare from the facility that Duke is putting in.
My question is that I wonder if the Mickey shape is even going to be visible from the road.