A team of Chinese researchers has modeled the potential global benefits of installing solar panels on outside building walls, a concept known as façade-integrated photovoltaics (FIPV). They found that solar panels installed on building façades not only generate substantial electricity but also reduce cooling demand, thereby reducing carbon emissions and improving urban climate adaptation.
The study, conducted by Prof. YAO Ling's team at the Institute of Geographic Sciences and Natural Resources Research of the Chinese Academy of Sciences, was published in Nature Climate Change .
As climate change intensifies heat exposure and extreme weather and increases electricity demand in cities, climate-resilient urban development has become a global priority. Buildings account for a large share of urban energy use and emissions. Solar photovoltaics provide a partial solution but are mainly deployed on rooftops, leaving vast vertical building surfaces largely underused.
In this study, the researchers developed a global model to quantify the energy and climate benefits of FIPV.
Using information on building geometry, exposed area, and meteorological data, the researchers simulated the electricity generation potential of FIPV worldwide. They then evaluated the influence of FIPV on buildings' heating and cooling demand. In addition, they analyzed carbon mitigation and climate adaptation benefits by linking generation–demand interactions on an hourly basis.
Assuming the most plausible deployment scenario, the researchers concluded that FIPV could generate about 732.5 TWh of electricity annually worldwide and reduce building electricity demand by 8.1% on average. They also showed that these combined benefits could translate into meaningful economic and climate gains, with more than 80% of simulated districts showing reductions in net lifetime electricity expenditures.
The study estimated that the reduction in cumulative carbon emissions could reach 37.7 Gt CO2 if FIPV adoption reached its maximum potential by mid-century. To achieve this goal, however, targeted policies, adaptive planning, and locally informed strategies would be required due to variations in urban morphology, climate conditions, building characteristics, and socioeconomic circumstances.
