The research project «M_Key» was started in October 2014 as part of the Swiss National Research Programme «NRP71 Managing Energy Consumption» and is planned to be terminated in autumn 2017. Partners of INFRAS are the University of Neuchatel and Impact Energy Inc. The overarching objective is to gain a better understanding of the determinants of energy-efficiency investments in Swiss companies. The project targets large energy consumer firms in Switzerland in the industrial and services sectors and aims at testing the main hypothesis that energy management significantly raises companies' assessment of the strategic character of energy-efficiency investments. Core elements to answer the research questions are a large national survey, face-to-face interviews and a small number of case studies among/with Swiss large-scale energy consumers.