In order to further improve regional sourcing and the environmental balance, considerations are currently being made to switch the energy supply from natural gas to biogenic energy sources.
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As part of the company’s internal sustainability strategy, the company is expanding its existing energy supply with several wood gasification CHP units, biomass boilers, a large buffer storage and several PV systems. The aim is to generate climate-friendly and renewable electricity and heat to supply the company’s own production halls.
MAN Truck & Bus SE has set itself an ambitious goal of reducing CO2 emissions by 50% by 2025 compared to 2015. The introduction of the energy management system in accordance with ISO 50001:2018 in all plants and the continuous further development of the CO2 roadmap are essential building blocks for the Group on the way to achieving this goal.
In order to replace the climate-damaging fuel lignite with CO2-free heat, the site managers decided to connect the plant to the local district heating network of N-Ergie. In addition to the conversion of the heat supply, several optimisation measures in the local heating network were also investigated in order to achieve the maximum CO2 savings.
Final consumers with high electricity consumption are entitled to an individual grid charge if their electricity consumption reaches a number of hours of use of at least 7,000 h/a per calendar year. For this reason, eta Energieberatung has developed and implemented a concept for load management with two emergency power supply systems.
The energetic weak points were analysed and solutions were proposed. Thus a concept could be developed which provides for a reduction of the heat input via the roof windows, improvements at the air curtains and a higher cooling capacity. The heat supply can be realised most economically by a central generation with CHP.
Possibilities for energy savings in the amount of 13.5 million euros per year were identified. These range from organisational measures to larger investment measures such as the realisation of a natural gas CHP. Measures with immediate or short-term amortisation alone have a savings potential of 6.5 million euros per year.
The analysis of the existing cogeneration plant showed that the operation of the natural gas cogeneration plant is still economical. The use of biomethane would make ecological sense, but is currently not economical. The production of cold from the absorber is only recommended if the heat comes from the CHP. In addition, an electricity/natural gas tender was carried out.