Synchronised Power Scheduling of Widely Distributed Refrigerators using IoT Topics: Algorithms for Reduced Power, Energy and Heat; Energy Management Systems (EMS); Energy Monitoring; Internet of Things for Sustainability; Optimization Techniques for Efficient Energy Consumption; Power Consumption; Smart Homes (Domotics) In Proceedings of the 10th International Conference on Smart Cities and Green ICT Systems SMARTGREENS - Volume 1, 89-93, 2021