In order to achieve the 1 GW rooftop photovoltaic (RTPV) target for Bangalore Electricity Supply Company (BESCOM) by 2021-22, CSTEP is developing a tool to accurately assess the potential of all rooftops in the city, using high-resolution aerial imagery (Light Detection and Ranging – LiDAR). This tool will help BESCOM in identifying the most suitable rooftops based on a multicriteria analysis. In terms of technical innovation, this exercise accounts for shading effects of neighbouring obstacles on individual rooftops while estimating the RTPV potential and in subsequent generation. The tool will also be available as a Web-based application for consumers to understand the feasibility of installing RTPV on their rooftops in terms of techno-economics. The tool’s outputs can be used to aggregate demand (>200 MW) for large-scale tenders, which will thereby reduce costs of RTPV systems and hence the tariffs required to be paid by BESCOM.