Energy effectiveness has become a competitive advantage for service providers managing large-scale centralized data centers. Technological solutions in this field have developed significantly in recent years, which exploitation should be supported by the organizational managament viewpoints. The goal of this study is to investigate how the companies develop their energy effectiveness and manage the functions connected with it. Based on multiple company case analysis we identified nine factors mostly influencing energy effectiveness. Derived from these findings we present finally a framework for environmental management, which can direct the organization to improve the energy effectiveness of its data center.