Vattenfall Heat Poland SA (Vattenfall) is a power company in Poland. Vattenfall is business unit of Vattenfall group and is principally engaged in the development, sale and marketing of district heating power plants in Poland. The company produces heat and electricity and is widely recognized as the largest manufacturer of heating network in the Polish market. The company also transmits and distributes heat. The works offered by the company include Elektrocieplownia Siekierki, Elektrocieplownia Zeran, Elektrocieplownia Pruszkow, Elektrocieplownia Wola Will heating plant and Cieplownia Kaweczyn. Elektrocieplownia Siekierki, is the second largest in Europe and largest polish heat and power plant. Zeran power plant is the second largest source of heat for Warsaw region. The company is headquartered in Warsaw, Poland.