Dunkelflaute hits Europe in winter with low wind and sun killing renewable production. Prices spiked from €107 to €936 per MWh in hours on December 12. Germany imported power during Dunkelflaute pushing prices higher abroad. Scandinavian countries blame Germany and threaten to cut interconnections. Renewables cause volatility as percentage rises with no storage. Fossil and nuclear previously stabilized market but renewables dominate now at 44.7% EU-wide. Interconnected grid sends power to highest prices harming low-cost producers. Yearly averages unaffected but spot prices explode short-term. Industrial users hit hardest by fluctuating daily rates. EU market deeply interconnected with 1/7th electricity traded cross-border. More renewables mean lower average prices but extreme spot highs. Electricity demand to rise 60% by 2030 straining old grids. Cross-border infrastructure priority for Green Deal goals. Demand flexibility and locational pricing needed to fix issues. Regions with wind solar hydro get price edge over others.