State and local governments have shelled out $68,734USD for 150 sqft of solar panel sidewalk. My slightly damp cocktail napkin - upon which my Manhattan formerly rested - rates that at about 2100W of panels, assuming 100% coverage. Excluding all the engineered inefficiencies, the solar sidewalk has a thirteen times higher capital cost than rooftop solar - assuming installation costs of both are zero.
This installation appears to just lay the panels on a sand bed, like one was laying brick pavers. The panels are now a stack up of laminated glass with the electronics sandwiched inside. The city of Sandpoint will have a web cam on the installation. I am going to have to ask if they will have a watt meter as well. :-/