Panagiotis G Kosmopoulos, National Observatory of Athens, Institute for Environmental Research and Sustainable Development (IERSD), Athens, Greece, Stelios Kazadzis, World Radiation center, Physikalisch-Metorologisches Observatorium Davos (PMOD), Davos, Switzerland, Charalambos Kontoes, National Observatory of Athens, Athens, Greece, Philippe Blanc, Centre Observation, Impacts, Energy, MINES ParisTech, Sophia Antipolis, France, Hesham Mohamed El-Askary, Chapman University, Center of Excellence in Earth Systems Modeling & Observations, Orange, CA, United States, Mohamed M. El-Khayat, New and Renewable Energy Authority, Cairo, Egypt and Dimitris Zografos, Independent Power Transmission Operator, Athens, Greece