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Achieving a net-zero-energy tall building with onsite renewables is a challenging task. A low-rise building on a low-density site would have a better chance of being a net-zero-energy building. Some argue that it is more beneficial to work towards net-zero-energy communities rather than net-zero-energy buildings. In general, most of the onsite building electricity generation is done using solar photovoltaic (PV) systems. The prices of solar PV systems have been dropping in most countries. This article investigates the potential of solar PV on the façades of a hypothetical 20 storey building in three selected locations in Sri Lanka. An hourly weather data file is generated for each selected location and the TRNSYS software tool is applied to simulate the performance of the solar PV system. We quantify the electrical output of the solar PV system and compare it with the electricity consumption in each location. The article …