In 2022 and 2024 Rosenberger installed further photovoltaic systems at the Fridolfing site. As a result, the site now has approx. 5,800 PV modules on a roof area of 21,000 mΒ². The system supplies the company with approx. 2.250.000 kWh of solar electricity per year, thus saving almost 844 tons of CO2 per year. At the same time emissions such as lead, nitrogen oxide or mercury are reduced.
A special feature of the photovoltaic system is the zero feed-in. By using 100% of the electricity produced by the solar plant, Rosenberger does not feed into the public Grid, therefore waiving the state feed-in tariff.
Due to the production process a large proportion of the metals used ends up as oil-contaminated chips in the chip and oil treatment plants. The cleaned oil can be pumped back into the cooling system and the metal chips - now containing less than two percent oil - to be returned to the materials supplier almost sorted by type.
This ensures optimal recycling of materials and only small quantities of new raw materials needing to be purchased.
A special feature is the highly efficient biomass heating plant. Around one sixth of the total energy required is generated by the heating plant using renewable energy sources - in this case local wood chips.
Rosenberger can cover more than 98% of its heating needs through the biomass heating plant. To meet the same energy demand with oil fuel about 565,000 liters would be necessary. Rosenbergerβs initiative therefore translates into an emission saving of approx. 1,500 tons of CO2.
The new Energy Center is equipped with four air compressor and heat recovery systems.
Since 2008 about 4,200 MWh of heat energy has been recovered. Accordingly, more than 1,000 tons of CO2 have been saved.
To further increase the efficiency of our heat recovery the waste heat from the compressed air generation is used as process heat for our surface technology. In this way, the amount of heat energy recovered can be increased to approx. 1.5 GWh per year which enables savings of over 2,000 mΒ³ of wood chips per year.
As part of the construction of a new production building in 2023 at the main site in Fridolfing, the 'Plant Cooling' project was initiated by the Energy, Buildings and Infrastructure department. The aim is to provide a central cooling water supply for buildings and production facilities, thereby increasing energy efficiency.
More than one million litres of firefighting water are used as thermal storage, and heat pumps combine heating, cooling and electricity. The cool temperatures at night and excess electricity from the photovoltaic system during the day can be thermally stored and used to cool buildings when needed. As a result, Rosenberger is already saving more than 65 tonnes of CO2 per year - and rising.