Solothurn receives a new waste incineration plant
The new Kebag Enova will be built in Emmenspitz in Zuchwil by 2025 and will not only be more modern, but also more energy-efficient.
Kebag in Zuchwil disposes of 221,000 tons of waste annually and supplies the region with district heating and electricity. It is the third largest waste recycling company in Switzerland. 85 percent of the waste comes from the 1,178 municipalities in the cantons of Bern and Solothurn. However, the plant will be 50 years old in 2025 – and will thus reach its age limit. In order to ensure environmentally friendly disposal in the future, a new system is essential. Because with increasing age, failures increase, which lead to expensive business interruptions and disposal bottlenecks, as the company writes on its website.
The company in Emmenspitz is already the largest electricity producer in the region. Throughout Switzerland, the largest proportion of electrical energy is obtained from the rubbish. The planned plant, called Kebag Enova, will in future be able to generate up to 15 percent more energy from the same amount of waste thanks to the latest technology. A special fabric filter and multi-stage flue gas cleaning lead to an almost complete reduction in pollutants. The investment costs amount to between CHF 450 and 500 million. But the new building cannot be implemented without any compromises: 11,000 square meters of forest had to be cleared. As compensation, Kebag is providing the same amount of replacement afforestation at other locations in the canton of Solothurn.
The company TBF + Partner AG from Zurich was commissioned with the planning mandate. Penzel Valier AG won the architecture competition in 2017. The Kebag Enova will have two instead of four incineration lines. Larger furnace lines are planned for this, which ensure greater energy efficiency. The building envelope is fitted with solar panels, making it currently the largest photovoltaic facade system in Switzerland. The chimney is attached to the side of the building and rises 80 meters in height. There is a viewing room at the top of this concrete shaft.
One or the other challenge had to be overcome beforehand: A significant change had to be made in 2018 to the cooling. The kebag has always used river water cooling. Cooling is essential so that electricity can be generated and the steam required for this can be used. Due to the revised Water Protection Ordinance, which came into force in mid-2018, the decision was made to use air instead of river water cooling for the new building. In addition, a test showed that the subsoil was not stable enough for the Kebag Enova. Thanks to a pile and slab foundation, this problem could also be solved.
The planning application was finally submitted in 2019. The groundbreaking took place on May 7, 2020. Commissioning is planned for the beginning of 2025.