The document summarizes a webinar on photovoltaic installations. It discusses the principles of photovoltaics and how solar energy is converted to electrical energy. It also reviews market trends in PV capacity, the development of building integrated PV, different PV technologies and materials, and examples of residential and commercial PV installations. Costs associated with PV systems and their components are examined. Future trends in thin film cells and concentrator photovoltaics that may drive further cost reductions are also outlined.