Germany pays 39.15 Euro cents per kWh, highest in EU. Turkey pays 4.88 Euro cents per kWh, lowest. Energiewende plan from 2010 causes sky-high prices in Europe's biggest economy. Renewables produce volatile output in winter from low sun and wind. Dunkelflaute periods slash renewable energy leading to price spikes. Backup sources or imports needed during dark doldrums. Effect minor for yearly averages but worsens with more renewables. Governments must minimize Dunkelflaute impacts. Energiewende serves as cautionary tale for other countries chasing renewables. High prices threaten German and European economies.