The paper discusses an investigation of how photovoltaics (PV) may be used as both a pollution-mitigating energy replacement for fossil fuels and a demand-side management (DSM) option to reduce peak electrical demands of commercial and residential buildings. Eleven electric utilities are partners in this first nationwide demonstration of PV DSM. The approach is to install and monitor standardized PV systems in diverse geographic areas with varying solar energy resource and electric power demand, production, and cost conditions. The systems will be monitored for a year to record direct and diffuse irradiance, ambient air temperature, PV power generation, and building loads. Utilities will provide the electric system operations data needed to determine the pollution mitigation and peak demand reduction that can result from the PV electrical power generation.