A few reasons PV on roofs might still make sense: * Cheap land may be far away from consumers, requiring expensive and inefficient transmission lines. * As PV

A few reasons PV on roofs might still make sense: * Cheap land may be far away from consumers, requiring expensive and inefficient transmission lines. * As PV costs come down, land cost become a higher fraction. Roofs do not require a land purchase. * Some locations are politically unwilling or unable to do large scale solar. rooftop solar provides a route for personal adoption. Finally remember the two options are not mutually exclusive!