One of the most frequently asked questions in the energy transition process concerns the question that addresses the coordination barriers between electricity planning and the planning of three large units. This presentation analyzes these barriers by providing an overview of energy systems and their relationship to transport and data centers. The biggest barrier is the lack of a framework that encompasses all energy systems (electricity, gas, hydrogen, heating and cooling) in their entirety -including customer installations - and enables structured processes in both operation and planning. The analyses show that compatible, fractal-based holistic *architectures** for all energy systems, enabling their coordinated planning and operation through structured processes, may help to remove this barrier.