70806 Ludwigsburg: With a collector area of 14,800 m², Stadtwerke Ludwigsburg-Kornwestheim has built the largest solar thermal plant in Germany. In a 20-meter high heat storage tank with a volume of 2,000 cubic meters, the solar-generated energy is available even when there is little or no solar radiation. The collectors collect around 5200 megawatts of heat per year, enough to supply around 300 average households. Completion: 2020