Energy efficiency increasingly becomes a relevant objective in industry. Factory planning plays an important role for energy-efficient factory, production and logistics systems. The design of systems and processes in intralogistics, as an essential part of factory planning, is in the focus of this paper. Existing approaches for energy efficiency-oriented planning of logistics systems are either empirical or theoretical. The paper describes an approach combining both aspects. With the presented approach, the energy consumption of a system in a factory can be determined and evaluated systematically. As a result, energy efficiency measures are deduced and generalized. The approach provides energy data and knowledge to support analyzing and optimization activities in planning processes.