Ecological and energy issues are pushing for action in the housing sector which is a major greenhouse gases emitter. Most solutions considered by public stakeholders have a significant technical dimension. However the existing energy management technologies have limited effectiveness and are difficult for many dwellers to use [11]. We propose new reflections concerning the design of resources systems integrating energy management technologies in social housing. These reflections are based on the understanding of Energy Management Activities (EMAs) complexity. More precisely we focus on EMAs collective and temporal dimensions and their implications on tasks sharing between different stakeholders (dwellers, lessor, third parties) and between these and technologies. Our work is grounded in Activity-Centered Ergonomics in collaboration with electrical engineering and intends to be built with actors concerned by energetical issues in a participative approach. We present our first research results: a mapping of strategic actors in social housing and energy to be involved in our research and first understanding on EMAs collective and temporal dimensions.