From theoretical investigations it is known that with optimized heat recovery and the energetic utilization of
organic matter from brewing residues (spent grains) and waste water modern breweries can potentially supply its
thermal energy demand over own resources (excluding space heating) [2]. By now this theoretical potential is not
fully utilized and hence the remaining energy demand is met by conventional means. Nevertheless a conversion
from conventional energy supply systems to energy supply systems based on renewable energies (sun, wind,
biomass, geothermal) and production residues (spent grains, waste water) may enable a 100% CO2 neutral beer
production process in the long run