Introduction . Climate fluctuations reflected in atmospheric and oceanic teleconnections can cause significant variation in the access to renewable energies, from daily erratic behavior to periodic patterns with durations of many years to decades1 , 2 , 3 , 4. Both short-term intermittency and long-lasting low renewable energy availability can potentially cause energy droughts5 , 6 , 7, which may lead to electric supply failure with a great impact on society8....