Flexibility coming from gas-fired power plants is still a need in the ongoing energy transition. Therefore, the link between electricity and gas networks is tight. However, in the current European regulatory framework, both energy systems are independently operated. This may result in unreliable and suboptimal decisions by preventing to leverage natural complementarities such as the ability of gas networks to provide flexibility (by storing gas in the pipelines) to mitigate the uncertainty from wind and photovoltaic generation. Hence, this project proposes a regulation-compliant solution towards integrated energy systems, by performing the short-term planning of the electricity grid informed by both the electricity and gas network constraints. Practically, the goal of the project is to address the fundamental challenges involved by such an improved coordination since both energy systems are characterized by non-linear behaviours. To that end, we combine traditional optimization-based models with data-driven techniques design a generic decision framework applicable to large-scale problems. The model is then enriched with new, advanced risk-based constraints to account for uncertainties and incomplete information in modern energy systems.