Buildings account for more than 40% of mankind’s total energy consumption. In order to reduce their carbon footprints, a holistic approach and a comprehensive set of measures are required, comprising (i) energy conservation and efficiency measures and (ii) replacing fossil fuels by renewable energy sources. A key issue for energy conservation is the passive design of high-rise buildings, i.e. facades. The properties of the facades determine the indoor environmental conditions and thus the energy consumption of the entire building. The possibilities of integrating photovoltaics into facades and developing solar thermal systems suitable for application in the tropics offer great opportunities for increasing the share of renewables in Singapore.