Institute of Enviromental Technology and Energy Economics, Hamburg University of Technology


To introduce a greater variety of geothermal systems on the market, the potential of using geothermal energy in combination with other renewable sources has to be analyzed. 
The presentation addresses the possibility to increase the power generation of one system by the combined use of geothermal heat and biomass. A recent study shows that a synergetic effect can be achieved by combining a biomass driven cogeneration unit with a geothermal power plant by using the waste heat on a higher temperature level. Within the study a technical and an economical analysis of combined systems were carried out. The results show, that
o	the use of waste heat from a biomass driven engine could have a positive    
         effect on the overall efficiency
o	the advantages depend on the geothermal properties as well as on the   
         temperature level of the waste heat source
o	the additional costs of the combined systems are negligible in comparison to 
         the overall costs of the geothermal system (e.g. drilling costs)
o	a combination may be usefull if,
         -	the generated power can be increased by implenting waste heat on a          
                similar temperature level
         -	the medium temperature of the supplied heat can be increased and 
                therefore the overall efficiency

Vilnius, Lithuania