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The fuel index method as a new planning instrument in the erection and redevelopment of residential estates; Das Brennstoffkennzahl-Verfahren als neues Planungsinstrument fuer Neubau- und Sanierungsvorhaben. Elsenberger, U. Physikalisches Inst. The fuel index method aims at the largest possible exploitation of conservation potentials in residential thermal energy supply. The introduction of a thermal quality standard for thermal energy systems lays the foundation in process engineering terms for a competition between environment-friendly thermal energy supply and thermal insulation, with the aim to save energy and cost. Using higher-grade thermal energy at higher cost than current energy costs is approved of if its use involves an ambitious conservation aim. In this way, particularly rational energy techniques are promoted.