Windmühlenberg

Hidden in plain sight, the Windmühlenberg whispers tales of transformation. This hill, once Karlsruhe’s Mülldeponie West, now stands as a testament to renewable energy. The Windmühlenberg, also known as Energieberg, isn’t just a hill. It’s a 60-meter-tall monument to Karlsruhe’s ingenuity. Located at the northern edge of Karlsruhe’s Rhine harbor in Knielingen, the Windmühlenberg earned its nickname “Energieberg” for a reason. It generates power and heat with a combination of wind turbines, photovoltaic systems, and combined heat and power plants. After World War II, the area served as a dumping ground for war debris and later household waste. However, since 2005, no new waste has been added. The city now transports over 200 tons of garbage daily by train to Mannheim for disposal. The Windmühlenberg’s story took a turn towards sustainability between 1999 and 2003. Three wind turbines were installed, the first two with a capacity of 750 kW each, the third with 1,500 kW. Later, to boost wind power production, a larger 2,000 kW Senvion turbine replaced the two smaller ones. In 2005, the city also added a large photovoltaic system on the south slope. The decomposing waste generates landfill gas, which has been used in combined heat and power plants since 1997. However, this energy source is gradually diminishing due to the halt in waste deposits. Today, the Windmühlenberg produces around 10 million kWh of renewable electricity annually, even powering nearby buildings and a tram depot through a local heating network. Constructing wind turbines on a landfill presented unique challenges. The limited stability and gradual sinking of the landfill required specialized foundations. Engineers, in collaboration with experts from the Karlsruhe Institute of Technology, developed a solution with built-in correction mechanisms to address potential tilting. The Windmühlenberg stands tall, a symbol of Karlsruhe’s commitment to a greener future. From a discarded past to a sustainable present, the Windmühlenberg’s journey is a reminder of the power of transformation.