1. INTRODUCTION  
1.1 Energy cost of mobile communications  
1.2 Energy cost of computing facilities  
1.3 The emerging role of Edge Computing  
1.4 Paper focus and novel contribution

2. REFERENCE SCENARIO AND ENERGY MODEL  
2.1 Reference MEC scenario  
2.2 System Energy Model  
2.3 Remarks on MEC scenarios

3. MEC NETWORK DEPLOYMENT  
3.1 Geographic Workload Distribution  
3.2 User Mobility Patterns  
3.3 Cell-free MEC Networks  
3.4 Remarks on MEC Deployment

4. RESOURCE PROVISIONING  
4.1 Service Deployment  
4.2 Data Placement and Caching  
4.3 Remarks on resource provisioning

5. RESOURCE ALLOCATION  
5.1 Task Offloading schedulers  
5.2 Mobility Aware Schedulers  
5.3 Joint Resource Schedulers  
5.4 Remarks on resource allocation

6. ENERGY EFFICIENT COLLABORATIVE LEARNING AT THE NETWORK EDGE  
6.1 Context-Agnostic Efficient Communication  
6.2 Context-Aware DL Optimization  
6.3 Remarks on collaborative learning

7. DISCUSSION AND OPEN CHALLENGES