Reliable electricity is essential for homes, businesses, industries, and critical infrastructure. However, access to the electrical grid can be unstable or unavailable in some regions. Generator sets provide a reliable solution for maintaining power continuity during outages or in locations without grid access. In this introductory chapter, we introduce TEKSAN generator sets, their role, applications, and the fundamental knowledge required to understand, operate, and maintain this equipment effectively. ___ #TEKSAN #TEKSANGenerator #GeneratorSet #DieselGenerator #BackupPower #PowerGeneration #EmergencyPower #ElectricalEngineering #GeneratorMaintenance #EnergySystems