Mellwig, P.P.MellwigPehnt, M.M.PehntOehsen, A. vonA. vonOehsenBlömer, S.S.BlömerLempik, J.J.LempikWerle, M.M.WerleLangenheld, A.A.LangenheldGanal, I.I.GanalGerhardt, N.N.GerhardtBecker, S.S.BeckerSchmidt, D.D.SchmidtLadermann, A.A.LadermannLinke, C.C.Linke2022-03-142022-03-142019https://publica.fraunhofer.de/handle/publica/410765The study assesses how climate targets can be achieved at the lowest possible cost and what role building efficiency plays in the energy system. To these ends, we analysed the cross-sectoral effects of building efficiency measures and their impact on the total economic cost of energy supply by linking four calculation models. The study also shows scenarios which compensate less efficiency by more renewable energy, heat pumps or synthetic fuels. One main focus of the analyses is how the scenarios can realistically be implemented. The study also examines the susceptibility of development paths to lock-in situations and the potential of flexible approaches to achieve more ambitious targets.enconference paper