Within two to three years, perovskite-based modules, perovskite-silicon-tandem cells and thin film perovskite cells will be commercially available. Today, tens of companies all over the world are developing manufacturing processes and setting up production capabilities. One of these companies – and one of the forerunners in setting up production facilities – is GCL in China. In the coming two to three years, it is expected that a production capacity of 0.4 to 1.3 GWp will be realized, worldwide. Already by 2020, modules that pass the IEC test will be developed (see figure below). However, the question is if this standard test, which was developed for silicon cells, can also guarantee a 20 year-warranty for perovskite-based cells. It will be key to gain more insight in degradation mechanisms and develop new tests.