The PGNiG Termika Zeran heat power station is seen across Vistula river in Warsaw, Poland August 19, 2015. Vistula, Poland's longest river, hit its lowest water level in more than 200 years because of a drought ravaging the country, a weather official said. A recent heatwave forced the country to sharply cut electricity supply to industry for the first time in over a decade and lack of rain also cut the amount of water needed to cool coal-fired power plants, from which Poland generates about 90 percent of its electricity. REUTERS/Kacper Pempel