Abstract: Increasing attention has been devoted to individual or household energy conservation in theprivate sector; however, there remains a gap in addressing the promotion of active energy conservation among energy users in group settings. To assess the effectiveness of information feedback strategies in motivating group users to save electricity, an 18-week field-controlled experiment was conducted. In view of the difference in energy-saving motivation, three experimental groups (economic feedback, abstract environmental feedback, and concrete environmental feedback) were established. A no-intervention control group was also included to evaluate the efficacy of the intervention strategies in promoting electricity conservation. Based on the real electricity consumption data collected from occupants via the power system, the PSM-DID method was employed to analyze the electricity-saving effects of the three intervention strategies. Results indicate that both the economic feedback and concrete environmental feedback groups significantly fostered active electricity conservation among group users. Among them, the economic feedback group exhibited the most substantial power-saving effect (14. 4%), followed by the concrete environmental feedback group (6. 2%), whereas the abstract environmental feedback group showed no significant deviation from the control group. Long-term effect testing of the intervention strategies further revealed sustained energy-saving effects in both the economic feedback and concrete environmental feedback groups even after cessation of the intervention. Notably, the concrete environmental feedback has better electricity-saving after the intervention stopped, which proves its long-term efficacy. Furthermore, the study identified that population heterogeneity influences the power-saving effects of different intervention strategies. 

Key words: feedback framework, energy-saving behaviors, long-term effct, difference in difference, field experiments