The growing share of intermittent renewable energy sources in the German energy supply system results in an increased demand for system flexibility. Power-to-Heat-solutions offer the possibility to use excess electricity generation from renewable sources for heating applications. Such energy sector coupling may lead to an increased system flexibility by a better integration of renewables and reduced greenhouse gas emissions. Heat pumps in combination with storages and the thermal mass of buildings can offer a certain load-shifting potential without affecting the residents' comfort. This potential depends on the physical characteristics of a building and the level of housing refurbishment [1]. A classification of the German building stock by age of building and building type with typical parameters for building materials before and after refurbishment is given in [2].
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