Tedjosantoso, NicholasNicholasTedjosantosoVieth, JonathanJonathanViethDoucet, FelixFelixDoucetDüsterlho, Jens-Eric vonJens-Eric vonDüsterlhoSpeerforck, ArneArneSpeerforckSchäfers, HansHansSchäfers2026-07-302026-07-302026-0622nd International Conference on the European Energy Market, EEM 2026https://hdl.handle.net/11420/64136Integrating distributed renewable energy sources and time-varying electricity pricing mechanisms creates new optimization opportunities for building energy systems. This paper investigates how different electricity price structures influence the cost-optimal dimensioning and operation of energy infrastructure in residential buildings equipped with photovoltaic systems, heat pumps, battery storage, and thermal buffers. The results imply that, in theory, the building thermal mass offers enough flexibility to benefit from electricity price dynamics and no other storage in form of batteries or thermal buffer is needed. Furthermore, four tariff options are analyzed for their benefits and disadvantages for different building types.enbuilding energy systemsbuilding thermal masscost optimizationdynamic electricity pricingheat pumpsNatural Sciences and Mathematics::541: Physical; Theoretical::541.3: Physical ChemistryTechnology::600: TechnologyConference Paper10.1109/EEM68581.2026.11589834