ADVANTAGES OF PHOTOVOLTAICS: Fuel source is vast and essentially infinite No emissions, no combustion or radioactive fuel for disposal (does not contribute perceptibly to global climate change or pollution) Low operating costs (no fuel) No moving parts (no wear) Ambient temperature operation (no high temperature corrosion or safety issues) High reliability in modules (>20 years) Modular (small or large increments) Quick installation Can be integrated into new or existing building structures Can be installed at nearly any point-of-use Daily output peak may match local demand High public acceptance Excellent safety record DISADVANTAGES OF PHOTOVOLTAICS: diffuse (sunlight is a relatively low-density energy) High installation costs Poorer reliability of auxiliary (balance of system) elements including storage Lack of widespread commercially available system integration and installation so far Lack of economical efficient energy storage