The incorporation of digital design methodologies within contemporary power plant projects is an imminent reality. Recognized across industries, System Engineering (SE) stands as a pivotal approach for the formulation of superior design frameworks. A notable evolution in this domain is the progression from document-centric to model-driven practices in system engineering, with Model-Based System Engineering (MBSE) emerging as a superior alternative. Central to MBSE is the utilization of the System Modeling Language (SysML), a pivotal tool for its advancement. This treatise elucidates the rationale for the adoption of SysML within the engineering of modern power plants, highlighting the essential communication channels between the architect and various project stakeholders. The paper meticulously delineates the modeling procedures, aligning them with established SE methodologies, thus serving as a blueprint for digital engineering endeavors.