1. Introduction to highly renewable energy systems 2. Grid Integrated Wind Technology 3. Grid Integrated Solar Photovoltaic Systems 4. Grid Integrated Solar Thermal Power Plants 5. Reactive Power Management 6. Impacts of Large Scale RE Penetration on the Stability of Utility Grid 7. Power Quality 8. Power System Protection 9. Variability of Renewable Energy Generation and Flexibility Initiatives 10. Energy Storage Systems and Control Algorithms 11. Optimal Reconfiguration of Conventional Generators 12. Optimal Reconfiguration of Utility Networks 13. Smart Metering and Optimal PMU Placement 14. Demand Side Flexibility Management 15. Regulatory Framework and Grid Codes 16. Assessment and Improvement of Grid Security and Reliability with High Renewable Energy Penetration 17. Conclusion (wrap up, open questions, future perspectives)