GreenGate’s blueprint for transformer substation monitoring provides best-practice applications for planning, scheduling, control, and documentation. The solution supports visual inspections and maintenance of pole-mounted, compact, and building-integrated substations, automatically generates maintenance orders based on system type, and enables guided recording of defects in all relevant system components. Additionally, tap change and transformer temperature are recorded, and the system condition is assessed based on defects and their severity. Transformer substations are a central component of energy distribution. Depending on their design, they are located in buildings or on poles and consist of transformers, associated equipment for the respective voltage level, and grounding systems. Regular inspections ensure safe operation and the early detection of malfunctions. Maintenance and repairs are carried out by the operator or by external service providers. Transformer substation monitoring presents numerous challenges. Planning must consider risk-based inspection intervals, limited personnel resources, regulatory requirements, and dependencies on other tasks. In the planning phase, geographical dispersal, unforeseen disruptions, and the coordination of vehicles, equipment, and teams complicate operations. During execution, safety management, weather and environmental factors, differing technical designs, and the need for rapid decision-making in case of defects are paramount. Complete and standards-compliant documentation is essential. It must include timestamps, photos, and measurement logs, be integrable with digital maintenance or asset management systems, and guarantee a complete history for authorities, insurance companies, and audits. Standardized data formats also form the basis for analysis and predictive maintenance.