The transformation of integrated electricity and heat systems—Assessing mid-term policies using a model comparison approach

The development of European power markets is highly influenced by integrated electricity and heat systems. Therefore, decarbonization policies for the sectors, as well numerical models that are used to guide such policies, should consider cross-sectoral interdependencies need evaluation. Many model-based policy assessments evaluate potential benefits combined power. However, extent benefits, emissions reductions, found in existing studies subject considerable variations. While scenarios model inputs may partly explain variations, differences results also be related formulation itself. Against this background, study first compare market context systems decarbonization. Five large-scale covering supply were utilized interactions between a rather simple coal replacement scenario more ambitious supports through power-to-heat. With focus on flexibility provision, reduction, economic efficiency, although agree qualitative effects, there quantitative differences. For example, estimated reductions overall CO 2 range 0.2 9.0 MtCO /a 25.0 power-to-heat scenario. Model can attributed mainly level detail modeling endogeneity generation investments. Based detailed comparison results, implications choices political decisions discussed. • Assessment experiment. Case analyzing phase-out Focus efficiency. Differences driven granularity CHP investment.