The roof or parking lot of a commercial building can generate revenue with solar sower.  Solar power is an investment strategy that goes on easy, requires almost no maintenance, and creates revenue for your building in many ways. With tax credits, accelerated depreciation, SRECs, and reduced electric expenditures your system pays for itself and creates a revenue stream from unused space.  Also, According to the Appraisal Institute, for every thousand watts of solar power you install, your property value increases by ten to twenty thousand dollars.