In order to be fully involved in the energy transition and anticipate the future needs of its customers, ENGIE relies on ENGIE Labs, its international network of research centres. In these laboratories, many projects are being brought to fruition every year, the aim being to design better quality buildings. Mariane G., Team manager - Digital transformation of energy services unit for ENGIE Lab Cylergie, tells us about the virtual building, a tool developed to perform energy simulations, and test heating system regulators in real time.