4.1 Introduction4.2 Industry 4.0: Concepts and Technologies4.3 Energy Efficiency in Manufacturing4.4 Integration of Energy Management Systems in Smart Factories4.5 Energy Monitoring and Optimization in Smart Factories4.6 Intelligent Control Systems for Energy Efficiency4.7 Energy Storage and Renewable Energy Integration4.8 Smart Grid Integration and Demand Response4.9 Case Studies and Best Practices4.10 Challenges and Future Directions4.11 ConclusionReferences